Metroliner SA227 - Systems

F21. POWERPLANT Explain the start sequence up to 60% RPM

0%RPM Starter/Unfeather pump on(in air only) Oil vent valve opens Anti-ice lockout valve closes 10%RPM Ignition Fuel solenoid valve opens Start fuel enrichment valve opens Primary only solenoid valve opens 40%RPM Engine is self-sustaining Start fuel enrichment valve is modulated by auto start to maintain 690C or by start button(Pilot) to maintain 650C 60%RPM Starter/Unfeather pump off Oil vent valve closes Anti-ice lockout valve opens Start fuel enrichment valve closes Primary only solenoid valve closes

B8. ELECTRICAL POWER SYSTEMS What are the two conditions for the battery fault detection to be operative?

1. Both generators must be on ? Batteries? 2. Left battery must be on and GPU must be plug in

F8. POWERPLANT Functions of SRL

1. Engine speed switching •Automatic control of the start sequence from 10-60% •SRL EGT computation about 80%RPM •Enabling CAWI operation and EGT temp limit above 90% 2. Automatic start fuel enrichment(10-60%) •Modulates the start fuel enrichment valve to provide fuel 3. Single red line EGT computation •Indicated EGT with a single maximum EGT of 650

B18. ELECTRICAL POWER SYSTEMS What is the 10 essential transferable items?

1. Pilot's DC instruments 2. Fuel cross flow valve 3. Pilot's turn and bank indicator 4. Surface deicer boots 5. Landing gear control 6. Landing gear position indicator 7. Cabin pressure dump 8. Left engine intake heat 9. Right engine intake heat 10. Left windshield heat

F20. POWERPLANT Two conditions for Fuel Bypass Valve to open

1. RPM above 90% 2. If EGT tends to exceed 650C

B21. ELECTRICAL POWER SYSTEMS What is the meaning of amber L/R AC BUS?

115 VAC bus is de-energized or circuit breaker is open

I2. ICE AND RAIN PROTECTION What is the difference between 14.5K and 16K airplane in regards to deice boots?

14.5K airplane have two boots per main wing while 16K airplane have 3rd boot system between engine and frame

A7 AIRCRAFT GENERAL What is the source for the rubber seal in the door?

18PSI bleed air through pneumatic valve

F2. POWERPLANT How many airflow stations on engine

1:ambient condition outside of the engine(air inlet) 2:compressor inlet 3:compressor discharge 4:turbine inlet 5:turbine discharge

I9. ICE AND RAIN PROTECTION What is the cycle time for prop heat?

2 blades every 34 seconds

L5. HYDRAULIC What is the normal hydraulics pressure?

2000psi: Warning is set for 1250psi

B3. ELECTRICAL POWER SYSTEMS Minimum battery voltage to start

22Volts

B2. ELECTRICAL POWER SYSTEMS What is the normal battery voltage?

24Volt

B9. ELECTRICAL POWER SYSTEMS Normal generator output

28.5 Volt

B1. ELECTRICAL POWER SYSTEMS Describe general electrical power system for SA227

28VDC, 115V AC, and 26V AC power. DC power is provided by ground power unit, engine driven starter-generators, and nicad or lead acid batteries. AC power is provided by two static inverters mainly supplies avionics and flight instruments. Warning and monitoring systems are provided to inform the pilot of the system status

A1 AIRCRAFT GENERAL What is the max operating altitude?

31,000ft

E5. FUEL SYSTEM Approximately how many pounds does hopper tank hold?

94 pounds

B17. ELECTRICAL POWER SYSTEMS What is the meaning of amber GPU PLUG IN?

A GPU plug is plugged into the external power receptacle(does not mean power is supplied)

B6. ELECTRICAL POWER SYSTEMS What is the meaning of red BATTERY FAULT? Is any other indication on warning panel?

A battery ground fault has been detected(there is a current imbalance in a battery feeder line). Both L/R BAT DISC also should be indicated

E8. FUEL SYSTEM Describe the crossflow system

A cross flow line interconnects the left and right forward collector tanks and incorporates a cross flow valve for fuel balancing by gravity feeding

E4. FUEL SYSTEM How does the hopper tank kept full?

A hopper tank is kept full by a jet transfer pump system, providing a boost pump is on, it forces fuel through the two jet transfer pumps for each hopper tank. The jet transfer pumps use the venture principle to draw fuel from the forward and aft collector tanks and return it to the hopper tank.

F9. POWERPLANT When do you see L/R SRL OFF light distinguished on start?

Above 80%, meaning SRL is on

N5. FLIGHT CONTROLS Describe the elevator trim system

Actuator containing two DC motors and two jackscrew mechanisms move the horizontal stabilizer leading edge up or down about a pivot new rear spar. Left seat controls left motor, right seat controls right motor from respective DC bus.

N1. FLIGHT CONTROLS What are the primary flight controls?

Ailerons, rudder, and elevators

H6. PNEUMATICS What is the primary component of vacuum system?

Air Ejector Pump: 18PSI bleed air passes through to create the suction(venture effect)

H5. PNEUMATICS What systems are affected by closing the bleed air switch?

Air-conditioning system and pressurization system *Engine anti-icing, 18/31psi pressure regulators are not affected

I4. ICE AND RAIN PROTECTION Describe the MANUAL mode on deice boot

All boots are inflated simultaneously. The boots inflated as long as the switch is depressed

C2. LIGHTING SYSTEM Describe the exterior light components and power source

All exterior lights are powered from non-essential bus. It consists of: •5-6 nav lights(2 each right, left, and tail) •1 red rotating beacon •2 wing ice lights •1 taxi light •3 strobes(right, left, and tail) •4 optional logo lights •2 landing lights and 2 recognition lights

E7. FUEL SYSTEM When do you see the XFER PUMP illuminated when boost pump is on? How about without boost pump?

Approximately 75 pounds, without boost pump on it will come out when approximately 600-700 pounds of fuel remaining

D13. MASTER WARNING SYSTEM What is the meaning of NOSE STEER FAIL light?

Arming valve is failed open

N11. FLIGHT CONTROLS When is SAS armed?

At lift off, and airspeed below 140 plus minus 5

E14. FUEL SYSTEM Physical location of the fuel pressure sensor

Between the low pressure pump and high pressure pump

J2. AIR CONDITIONING Describe the air cycle machine

Bleed air from engine goes to the air cycle machine, which contains a cooling turbine and an air-to-air heat exchanger. Hot bleed air first passes across the heat exchanger, which uses ram air as the cooling medium. The pre-cooled bleed air enters the cooling turbine which can cool the air to 30 to 60F below OAT

G8. FIRE PROTECTION What can cause the WING OVHT flashing warning light to come on?

Bleed air lines supplying the air conditioning and ice protection systems are routed inside the wing leading edge, also wire bundles with battery and generator power cables in the same area can cause. Heat sensor is set for 250F

G9. FIRE PROTECTION What can cause the WING OVHT steady warning light

Bleed air lines, brakes, tires for wheel well and cooling turbine in condition air duct... Heat sensor is set for 350F for wheel well and 450F for air duct

H4. PNEUMATICS What does bleed air toggle switch do?

Bleed air toggle switch electrically closes bleed air shut off valve(non essential bus) The valve is spring loaded-closed when engine is not running, and opens when engine is running by bleed air pressure(pressure regulating). Switch to off position allows pilot to Electrically Power Closed the valve

G6. FIRE PROTECTION How do you discharge the bottle?

By pressing the FIRE light indicator

F3. POWERPLANT How does the propeller connected to engine? RPM?

By reduction gear. 100%RPM(41,730) rotates prop at 1,591RPM

B4. ELECTRICAL POWER SYSTEMS How do you check the battery voltage prior to start?

By selecting appropriate voltimeter switch position. The battery switch should be OFF when checking

K5. PRESSURIZATION How do you control pressure with AUTOMATIC selected?

By selecting desired cabin pressure on CABIN ALT knob, which regulates the outflow valve through the pneumatic relay

C1. LIGHTING SYSTEM Difference between cockpit lighting system and cabin in regards to power source?

Cockpit lighting is powered from all three DC buses, while cabin lighting is powered from the non-essential bus with the exception of the entrance(left battery), cargo, and baggage lights(right battery).

J1. AIR CONDITIONING What two types of air does air conditioning system supplies?

Cold air through the cabin and cockpit "eyeball" outlets and conditioned air is delivered to the passenger cabin via the conditioned air ducts as well as to the cockpit via foot-warmers

F33. POWERPLANT What is CAWI system?

Continues Alcohol Water Injection system is used during takeoff to recover power lost at high density altitudes. The mixture used is 40% methyl alcohol and 60%water

K6. PRESSURIZATION Moving a MANUAL CONTROL knob to...

Counterclockwise - DECREASE - opens the outflow valve, decrease the cabin differential pressure, increases cabin altitude Clockwise - INCREASE - increases differential pressure and decreases cabin altitude

N7. FLIGHT CONTROLS What kind of flaps does SA227 have?

Double slotted, fowler flaps, electrically controlled and hydraulically actuated

E10. FUEL SYSTEM Where is the fuel shutoff valves physically located at?

Each wheel well, before firewall

F15. POWERPLANT How can you open/close fuel solenoid valve?

Electrically opened by pressing the start system(10%) Electrically closed by pressing the stop button Mechanically closed by pulling the STOP and FEATHER knob *You can't mechanically open the valve

F14. POWERPLANT Fuel Control Unit system

FCU contains underspeed/overspeed governor, and manual control of fuel metering. • Underspeed Governor: increase fuel flow in underspeed condition, it also maintains RPM during Beta mode. It can be set between 71-97%RPM by the speed lever •Overspeed Governor: safety device to prevent engine overspeed In the event of pop malfunction. 103-105%RPM set •Manual control of fuel metering: Power Lever forward of FLT IDLE, which meters more fuel than underspeed governor.

B12. ELECTRICAL POWER SYSTEMS Why do we reset Gen button after start to bring it on?

Fault transformers on feeder line are used to provide ground fault protection. During the start with imbalance could open the relays. Pressing the reset will reset the protection circuit if fault no longer exists.

B23. ELECTRICAL POWER SYSTEMS What could be the possible indication of 26VAC failure?

Flag on RMI

G3. FIRE PROTECTION How many heat sensors are there in each engine? How do they function? What is their temp setting?

Four heat sensors. Each functions independently, but they are connected in parallel to active the FIRE warning light when any one detects an overheat condition. They are three 450F and one 600F temperature setting.

B24. ELECTRICAL POWER SYSTEMS Where does GCU receive power from?

From respective essential BUS START CONT 2 circuit breaker

F1. POWERPLANT Briefly describe the engine and SHP on dry/wet

Garrett TPE331-11U: rated at 1000SHP dry/ 1100 SHP wet, it is a two stage, centrifugal compressor(10:1) and three stage, axial flow turbine mounted on a single shaft

M8. LANDING GEAR AND BRAKES What does red light on gear position indicator mean?

Gear is in transit

J3. AIR CONDITIONING Describe the difference between AUTO, HOT, COLD, and OFF position.

HOT - mixing valve open fully COLD - mixing valve closes fully AUTO - power is applied to the temperature controller, allowing this unit to maintain the cabin air temp. OFF - off

G5. FIRE PROTECTION What kind of extinguisher bottle in the airplane? How do you check if the bottle is o.k?

Halon bottle. There is a pressure gage which is visible during the preflight.

G2. FIRE PROTECTION Where are heat sensors and heat detectors located?

Heat sensors are located in each engine nacelle and each wing. Over heat detectors are located within leading edges, wheel wells, and conditional air ducts.

N9. FLIGHT CONTROLS How does flap operate?

Hydraulically operated. When selected in position, flap selector valve and lock valve will create fluid lock to hold that position

M1. LANDING GEAR AND BRAKES When does gear warning horn activated?

If all three gears are not down and locked when flaps are extended more than one half travel or either power lever is retarded to flight idle

F29. POWERPLANT How do you "manual start"?

If no fuel flow or ignition is observed at 10%, and there is no EGT rise, it is possible that the automatic sequence failed. Manual Start: SPEED SW SELECT switch OFF, Start button press, move SPEED SW SELECT MANUAL as the rpm rises 10%, this opens the fuel solenoid valve, powers the ignition unit, and initiates other starting event. After start is successful, return the SPEED SW SELECT to AUTO *Make sure to test SRL/temp limiter prior to flight

K4. PRESSURIZATION How do you control pressure with MANUAL selected?

If the manual selected, then pneumatic relay is controlled by the adjacent CABIN PRESS MANUAL CONTROL knob

F23. POWERPLANT When does Unfeather pump be activated in flight? How about on ground?

In air, as soon as the START button is pressed by gear squat switch. On the ground, activate by pilot with L or R position switch

K7. PRESSURIZATION Why do we want to have manual control in all the way to clockwise position?

In case we have to use manual mode in high altitude

D10. MASTER WARNING SYSTEM What is the meaning of L/R DUCT HEAT CYCL?

Indicated oil cooler inlet duct anti-ice thermostat is operating to heat the oil cooler inlet duct

A3 AIRCRAFT GENERAL Where is the CAWI tank located?

Inside of the nose baggage compartment

B22. ELECTRICAL POWER SYSTEMS What is the possible cause of both L/R AC BUS illuminations?

Inverter failure * If only one BUS fails then don't switch Inverter, switch pilot

A4 AIRCRAFT GENERAL List some of the equipment located in the tail section

Inverters, SRL computers, oxygen cylinder, and other airplane system components

L8. HYDRAULIC What happens if you pull the pip pin and moves the handle 90 degrees forward?

It frees the hand pump for operation and position the hand pump engage valve to direct pressure to the landing gear(mechanically) The fluid is directly routed from the hydraulic reservoir

G4. FIRE PROTECTION How does heat detector work?

It is a stainless steel tube containing two contacts. If excessive temp is detected, a contact is made, it illuminates FIRE warning light. When temp drops, it cools and opens up the contacts which extinguishing the FIRE light

M2 LANDING GEAR AND BRAKES How does nose wheel steering controlled and actuated?

It is electrically controlled and hydraulically actuated; when disengaged, it reverts to the caster mode. The rack-and-pinion nose steering actuator moves nose gear left and right. With PARK button pressed it is variable authority and it increases the range as commanded by rudder pedal

A5 AIRCRAFT GENERAL Explain main cabin entrance door locking system

It is equipped with 7 click-clack latches and two alignment pins.

F32. POWERPLANT Describe fuel purging system

It is installed to purge residual fuel in the flow divider and fuel manifolds into the combustion chamber during a normal engine shutdown. The air accumulator is charged by engine bleed air when rpm increases to 96%, pressing the STOP button opens the purge valve, and the residual fuel under accumulator air pressure enters the combustor and burns.

K2. PRESSURIZATION Where is the outflow valve located and how does it work?

It is located on the aft pressure bulkhead. The valve is used to control the flow of air out of the a/c by responding to pressurization control system through the pneumatic relay. Valve is opened by vacuum and closed by spring force. 7.25psi is set to open the valve regardless of the command.

F28. POWERPLANT Stop and Feather knob, what do these actually control? What happens if you pull? What happens if you push in?

It is mechanically connected to the fuel solenoid valve and the prop feather valve. When the knob is pulled it closes fuel solenoid valve before the feather valve opens. Pushing the engine stop and feather knob moves feather valve to normal position but fuel solenoid valve remain closes: start button is pushed to open the valve

L3. HYDRAULIC How is the hydraulics reservoir pressurized and how much psi on the system? How does it regulate?

It is pressurized by 31psi, regulated by bleed air

F26. POWERPLANT What is NTS lockout system?

It prevents negative torque sensing as an engine failure during landing rollout. Power lever aft of FLT IDLE, the NTS lockout valve opens and drains oil from prop, which resets the prop governor 5% higher. Because of valve opened, oil can't build up to move feather valve and supplies oil pressure through pitch control(PL) to operate the blades.

A8 AIRCRAFT GENERAL Explain cargo door warning and test function

It tests to confirm proper operations of the cargo door latching system. When door is unlatched, DOOR UNSAFE illuminates. If all micro switches are in correct(open) position then green SWITCHES NORMAL light illuminates

F6. POWERPLANT What happens to engine instruments if you lose one of the essential bus?

It will automatically be powered by the opposite essential bus

I12. ICE AND RAIN PROTECTION How many SAS vanes? R/L PITOT/SAS heat switch difference?

Just one. Either side of PITOT/SAS HEAT switch can energize SAS vane heat.

L1. HYDRAULIC What systems are operated by hydraulic system?

Landing gear, flaps, and nose-wheel steering

E9. FUEL SYSTEM Where does crossflow switch and valve are powered from normally?

Left essential bus, can be transferred to right essential but by essential bus transfer switch

D9. MASTER WARNING SYSTEM What are you testing when you press FIRE EXT TEST?

Lights and fire extinguisher circuit integrity

F18. POWERPLANT What is fuel anti-icing valve?

Located aft of fuel heater, it takes high pressure pump output to be routed through the heater to maintain the temperature of the fuel

F19. POWERPLANT What is anti-icing lockout valve?

Located before the fuel heater, it is closed during engine start to prevent fuel from bypassing through the fuel heater. Valve closes when START button is pressed and opens at 60%RPM(650C limit)

I10. ICE AND RAIN PROTECTION What is the difference between WSHLD HT low and high?

Low - power from right essential bus activates a relay which causes heating elements in the windshield to heat in series(both call for heat for operation), temp control is powered from respective bus. Temp control will attempt to keep between 90-100F. When either temp controller is calling for heat the respective left/right W/S HT light on the annunciator panel illuminated. High - both operates independently from respective bus

E11. FUEL SYSTEM Is anyway to check fuel quantity other than looking at fuel gauge?

Magna stick on each wing

F27. POWERPLANT Explain synchrophasing system

Magnetic sensors for each prop transmit inputs to the sync controller. Sync controller then outputs to governor to control

E6. FUEL SYSTEM Which bus do Main boost pump and aux. boost pump get power from?

Main boost pump gets powered from respective DC essential bus. Aux. boost pump gets powered from opposite DC essential bus.

D2. MASTER WARNING SYSTEM How can you dim the green part of annunciator panel?

NAV light

J4. AIR CONDITIONING Describe the difference between FRESH AIR NORM and OVERRIDE

NORM - blower under the floor of the forward cargo baggage circulates ambient air through the cockpit by non essential bus. It will automatically stops when the nose gear retracts. OVERRIDE - bypasses the nose gear up limit switch to permit cockpit ventilation during un-pressurized flight.

F25. POWERPLANT Describe the NTS system

Negative torque(as a result of prop driving engine, i.e. loss of engine power)system provides for automatic drag reduction. When NTS sensed, it closes NTS valve, it makes oil pressure to build up and moves the feathering valve, dumping oil from the prop servo piston(prop hub) through the feathering valve to gearcase. The increasing blade angle removes negative torque, and the NTS valve opens again, resulting in the feather valve moving back normal under the influence of spring.

I11. ICE AND RAIN PROTECTION When you see SAS DEICE light, does it mean that SAS vane being heated?

No, green SAS DEICE light means that the SAS heat relay has operated and not the indication of actual heat being applied

M5. LANDING GEAR AND BRAKES Does main gear door remain opened after the gear retraction?

No, it will close mechanically. Gear Door Position light only illuminates on ground if it is not latched closed

M7. LANDING GEAR AND BRAKES Can you move up the gear lever on the ground?

No, on the ground, a solenoid-actuated locking device engages to hold the lever in the DOWN position. Airborne, a squat switch on the left main gear completes circuitry to release the locking device. If solenoid or electrical power fails, pushing down on the LVR LOCK OVERRIDE lever releases the locking device

N4. FLIGHT CONTROLS Is there a trim tabs on the elevators?

No, pitch trim is accomplished by moving the horizontal stabilizer

N3. FLIGHT CONTROLS Can you move control locks in flight?

No, when power levers forward of flight idle, can't lock due to mechanical blockage

E13. FUEL SYSTEM What is the power source for the fuel totalizer

Non-essential bus

M9. LANDING GEAR AND BRAKES Nosewheel-steering limit in degrees

Normal - 10 degrees to left or right Variable authority - 63 degrees left or right

E12. FUEL SYSTEM What happens if you lose one of the DC essential bus in regards to fuel quantity gauge?

Nothing, it is an automatic transfer system switches to other essential bus

E3. FUEL SYSTEM Where is the water drains located?

One on each forward collector tank, and two drains on hopper tank

F17. POWERPLANT What is start fuel enrichment valve?

Part of SRL function; provides automatic or manual fuel enrichment to assist engine start. It operates 10-60% RPM to maintain start EGT at approximately 690C Manual Start: it opens as long as start button is held(10-60%RPM)

K3. PRESSURIZATION What is pneumatic relay?

Pneumatic relay is used to speed up the reaction time of the outflow valve to commands provide by control system since the valve is located far aft. It is just repeating the command from control system

B15. ELECTRICAL POWER SYSTEMS What is the possible cause of one DC amps reading 0 and other is reading high?

Possible 325 amps circuit breaker blown

F31. POWERPLANT How do you unfeather the prop on the ground?

Power Lever in full reverse, and move the unfeather test switch L/R

H2. PNEUMATICS Which system does 31PSI bleed air supply to?

Pressurizing the hydraulic system reservoir

F16. POWERPLANT What is Primary Only Solenoid Valve?

Primary Only Solenoid valve is opened during engine starts at 10%RPM to increase the proportion of fuel metered to the primary fuel manifold. Valve closes at 60%RPM

L6. HYDRAULIC What kind of indication will you see when the pump fails?

Red R/L HYD PRESS light(output is low)

G7. FIRE PROTECTION Which electrical bus does fire detectors and extinguisher get powered from?

Respective essential bus

N6. FLIGHT CONTROLS Aux Trim switch is controls:

Right seat trim system, aux. overrides inputs from copilot control trim switch(moves right DC motor, same as copilot side

N2. FLIGHT CONTROLS What locks on control locks?

Rudder and ailerons

N12. FLIGHT CONTROLS SAS input

SAS vane, airspeed, and flap position

F30. POWERPLANT What is the procedures for residual heat starts?

START TEST switch L or R position up to 15%, then press START button

A2 AIRCRAFT GENERAL What kind of fuselage structure?

Semi-monocoque structure built in 3 sections: nose, cabin, and tail section

B10. ELECTRICAL POWER SYSTEMS Generator amp limit

Some aircraft 305amps at 71%RPM Continuous load is 200amps, 300amps/200amps in flight depends on model

F24. POWERPLANT Describe start locks system

Start locks are used to maintain a blade angle that will produce the minimum resistance to start acceleration. It consist of two spring loaded pins that engage the propeller piston and lock the blades in flat pitch. By selecting REVERSE with the power lever to remove the shear loads. The centrifugal forces produced by the rotating propeller overcome the spring load and disengage the pins from the piston

B19. ELECTRICAL POWER SYSTEMS How can we restore the AC power if the left generator fails during flight?

Switch Inverter from 1 to 2

D8. MASTER WARNING SYSTEM What is the meaning of green OK light on fire extinguisher panel?

The FIRE EXT TEST is good

K1. PRESSURIZATION Describe the pressurization system in general

The airplane is pressurized by controlling the volume of conditioned air being exhausted from the cabin through the outflow valve. Either one engine can maintain cabin pressurization. Normal max cabin differential pressure of 7.0 psi, allowing a sea level cabin pressure altitude at airplane altitude up to 16,800ft gradually increasing to 7,000ft at an airplane altitude of 30,000ft.

D12. MASTER WARNING SYSTEM What is the meaning of BYPASS OPEN light?

The associated engine fuel bypass valve is open

D7. MASTER WARNING SYSTEM What is the meaning of yellow E light on fire extinguisher panel?

The associated fire extinguisher bottle has been discharged and is empty or the FIRE EXT TEST is actuated

L7. HYDRAULIC Describe the auxiliary hydraulic system

The aux. hydraulic system is powered by the emergency hand pump, provides pressure for emergency extension of the landing gear. The gear cannot be retracted with the aux. system.

D3. MASTER WARNING SYSTEM What is the meaning of L/R FUEL valve position lights?

The engine fuel shutoff valve is not in the position selected by the switch or is in transit

D4. MASTER WARNING SYSTEM What is the meaning of L/R HYD valve position lights?

The engine hydraulic shutoff valve is not in the position selected by the switch or is in transit

G1. FIRE PROTECTION Describe the fire protection system in general

The fire protection system consists of engine and wing overheat detection systems, engine fire-extinguishing systems, flammable fluids protection, and heat-protective sleeves on wiring bundles in areas which might be subject to overheat. There are cockpit warning lights located on the annunciator panel and on the fire extinguisher control assembly.

D5. MASTER WARNING SYSTEM What is the meaning of X-FLOW OPEN light?

The fuel crossflow valve is not closed; it is in transit or open

B13. ELECTRICAL POWER SYSTEMS What is the meaning of amber L/R GENERATOR FAIL?

The generator relay is open

B5. ELECTRICAL POWER SYSTEMS What is the meaning of amber L/R BAT DISC?

The indicated battery relay is disconnected

M6. LANDING GEAR AND BRAKES What does landing gear lever actually control?

The lever controls to the solenoid-operated gear selector valve. It also mechanically releases the uplocks

F12. POWERPLANT Briefly describe oil system operation

The pressure pump draws oil from the tank and supplies it under pressure to the oil filter, then to each item. Two scavenge pumps in the gearcase are used to scavenge the oil back to the tank via fuel heater and oil cooler. The rear turbine bearing has its own scavenge pump.

K8. PRESSURIZATION Where is the Safety(dump) valve located? How does it work?

The safety dump valve is located on the left side of the forward pressure bulkhead. The valve is opened by vacuum and is spring loaded closed. It is also opened by a solenoid-operated control valve. It is set to open when cabin pressure exceeds 7.25psi, powered from essential bus which is transferable. There is a squat switch on right landing gear, opened on ground and closes after takeoff if the switch is selected to be NORM

D11. MASTER WARNING SYSTEM What is the meaning of OPEN in fuel crossflow switch light?

The switch is selected to open the crossflow valve * It is not the indication of valve being open

A9 AIRCRAFT GENERAL Describe Emergency Exits

They are a plug-type and open into cabin. Three exits are located over the wings; two on the right and one on the left

C3. LIGHTING SYSTEM What is the power source for emergency exit lights?

They are self contained, constructed of an electroluminescent material

I7. ICE AND RAIN PROTECTION Why should we press the intake test switch after using the intake heat?

To make sure the valve is closed. By pressing the test switch and if the intake heat light illuminates the valve is closed(agreement light)

M3. LANDING GEAR AND BRAKES How many actuators on each gear?

Two

M4. LANDING GEAR AND BRAKES How many actuators are pressurized for retraction and extension?

Two actuators for retraction, and one for extension; When gear is down, the selector valve remains energized and pressure is constantly applied as long as electrical power and hydraulic pressure are available

L2. HYDRAULIC How many hydraulic pumps do we have?

Two engine driven pumps, one on each engine

B20. ELECTRICAL POWER SYSTEMS Describe the inverter briefly

Two inverters are installed supplying AC powers. They are single phase, solid state, and only one is used at a time

F5. POWERPLANT How many igniter plugs?

Two on each engine

E2. FUEL SYSTEM Describe the fuel vent system

Two ram air scoop tank vent is located on the lower outboard surface of each wing, a vent balance line is routed that enables cross venting between the tanks, guiding to vent drain at the center wing section

I6. ICE AND RAIN PROTECTION Is there limitation for using ENGINE&PROP HEAT?

Use of engine inlet heat on the ground must be restricted to a max of ten seconds and 71% RPM when OAT is above +5

E1. FUEL SYSTEM What kind of tank design does Metro have?

Wet wing tank

F7. POWERPLANT Significance of EGT gage

When RPM is below 80%, the EGT gage shows compensated EGT. Above 80%, it shows EGT computed by SRL

A6 AIRCRAFT GENERAL Cabin door warning light illuminates:

When any of one of the latches is unlocked

I3. ICE AND RAIN PROTECTION Describe the AUTO position on deice boot

Wing boots inflate 6 seconds, then deflate while the horizontal stabilizer boots inflate for 4 seconds, then 170 seconds rest, overall cycle time is 180 seconds(3mins)

B16. ELECTRICAL POWER SYSTEMS How do you check current limiters?

With both batteries and generators on, check both DC ammeters(loadmeters) indicating a load(325amps), then press the annunciator press-to-test and ensure L/R BETA(225 amps essential BUS) and Low Suction(150amps Non-essential BUS) are illuminated

N8. FLIGHT CONTROLS Are both flaps connected?

Yes they are mechanically interconnected

B14. ELECTRICAL POWER SYSTEMS Can we try to reset the generator being disconnected?

Yes we may try once. First turn off the generator, then select voltmeter. If not normal, reset. If normal try to connect it. If generator will not connect after being reset then call maintenance(no further action is possible)

N10. FLIGHT CONTROLS Can we retract flaps if not working properly?

Yes, moving the flap lever to the full up position should pass the logic box and permitting retraction in event certain logic circuit fail

L4. HYDRAULIC Is anyway to check the fluid level?

Yes, through the sight glass fluid level indicator

B7. ELECTRICAL POWER SYSTEMS Can we attempt to reset the batteries back on line?

You may try. By first selecting batteries switches OFF then REST, and ON

D1. MASTER WARNING SYSTEM Describe the overall master warning system components

•Annunciator Panel •Valve position annunciator panel(fuel, x-flow, hydraulics) •Fire extinguisher annunciators •Oil cooler inlet duct heat cycle lights •Fuel cross flow switch light •Fuel bypass light •Cargo door warning and test •Nose steer fail light

F11. POWERPLANT Oil systems provides:

•Cooling and lubrication of the main engine bearings and reduction gear •Prop control •NTS •Unfeathering pump

H3. PNEUMATICS Which systems do 18PSI bleed air supply to?

•Door seals •Cockpit window purge system •Deice boot system •Air ejector pump for the suction system

F10. POWERPLANT Inputs to SRL

•EGT(T5) •Engine RPM •Compressor inlet temperature (T2) •Airspeed/Altitude from the deltaP2/P5 transducer •AWI

H1. PNEUMATICS List the systems provided by engine regulated and unregulated bleed air

•Engine and Nacelle Anti-icing(Unregulated) •Air Conditioning •Pressurization •Hydraulic Reservoir •Suction Control •Door Seal •Window defog •Deice Boot

D6. MASTER WARNING SYSTEM What is the meaning of red FIRE light on fire extinguisher panel?

•Excessive temperature in the associated engine nacelle •The annunciator panel PRESS TO TEST is actuated •The FIRE EXT TEST is actuated

F4. POWERPLANT List accessories driven by the reduction gear

•Fuel control and engine driven fuel pumps •Hydraulic pump •Starter-generator •Tach generator •Propeller governor •Oil pump

F22. POWERPLANT Describe the AUTO ignition mode

•It allows SRL auto-start to control ignition during start(10% on and off at 60%) •It activates when NTS system is activated- up to 30 seconds after the negative torque ceases *OFF mode permits normal engine starting but lacks the NTS feature

I5. ICE AND RAIN PROTECTION What happens when you press ENGINE & PROP HEAT?

•It routes hot bleed air to the engine intake, P2T2 Probe (upper portion), heat transfer from engine oil keeps lower portion of inlet free of ice •Propeller deice •Oil cooler duct anti-ice

F13. POWERPLANT Inputs to Fuel Control Unit

•Power lever position •Speed lever position •P2T2 •RPM •P3

I8. ICE AND RAIN PROTECTION What happens when you press PROP&DUCT HEAT?

•Propeller deice •Oil cooler duct anti-ice

F35. POWERPLANT What happens when CAWI is activated?

•Pumps operate •Bleed air valves close •AWI shutoff valves open •AWI fluid is now flowing to the spray manifold at the top of the inlet •It continues to inject until fluid is empty, switch is off, or rpm below 90%

F34. POWERPLANT Conditions required for CAWI to be activated

•RPM more than 90% •Power Lever must be 1 inch forward of Flt Idle(to close a microswitch) •Water Injection switch must be placed in CONT

H7. PNEUMATICS System operated by vacuum system

•Vacuum instruments •Hold down suction phase of the surface de-ice boots •Control of the pressurization system *Bleed air from either engine is sufficient to maintain full system operating capability

B11. ELECTRICAL POWER SYSTEMS Generator Control Unit functions

•Voltage regulations •Generator paralleling •Relay control •Reverse-current control •Ground fault protection •Overvoltage protection

I1. ICE AND RAIN PROTECTION What are the components associated with ice and rain protection?

•Wings and horizontal stabilizer(electrically controlled and pneumatically operated boots) •Engine and nacelle inlets(electrically controlled and heated by hot bleed air tapped from the engines) •Propellers(electric) •Oil cooler ducts(electric) •Windshields(electric) •Pitot tubes and SAS vane(electric) •Fuel system(automatically heated by hot scanvenge oil)