Advanced Aircraft Systems Quiz 1
In a turbojet engine with a high and low pressure compressor, what order is the low pressure compressor and low pressure turbine in?
(WRONG)Low pressure compressor is in the very front and the low pressure turbine is all the way in the back. (WRONG)
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When starting a turbine engine how many ignitors need to be firing for light off (increased ITT) to occur?
1
The basic principle of the airplane turbine engine is identical to any and all enginesthat extract energy from chemical fuel. The basic 4 steps for any internal combustionengine are:
1. Intake of air 2. Compression of the air 3. Combustion, where fuel is injected and burned to convert the stored energy. 4. Expansion and exhaust, where the converted energy is put to use.
The B767 Mel indicates: This category C item 21-1 Engine Anti-Ice Valves (Cont'd) 3) Stator Vane Valves (JT9D-7R4) C 2 1 (M)(O) One may be inoperative open provided appropriate EPR limit and performance adjustments are applied. The maintenance on this item can be deferred for _____________days per the MEL.
10
The B767 Mel indicates: This category C item 31-1 Elevator Feel Pressure Takeoff Limit Function (-400ER) C (O) May be inoperative provided: a) Appropriate takeoff center of gravity restrictions are observed, and b) Improved Climb takeoffs are not conducted. The maintenance on this item can be deferred for _____________days per the MEL.
10
The B767 Mel indicates: This category C item 31-1 Elevator Feel Pressure Takeoff Limit Function (-400ER) C 1 0 (O) May be inoperative provided: a) Appropriate takeoff center of gravity restrictions are observed, and b) Improved Climb takeoffs are not conducted. The maintenance on this item can be deferred for _____________days per the MEL.
10
The B767 Mel indicates: This category C item 31-1 Flight Data Recorder (FDR) System (Includes Digital Flight Data Acquisition Unit (DFDAU)) C - 1 May be inoperative provided: a) Cockpit voice recorder (CVR) operates normally, b) Airplane is not dispatched from a designated airport as listed in operator's MEL unless: 1) FDR failure occurs after pushback but prior to takeoff, or 2) FDR repair was attempted but was not successful, c) In those cases where repair is attempted but not successful, aircraft may be dispatched on a flight or series of flights until next designated airport where repair must be accomplished prior to dispatch, and d) Repairs are made within 3 flight days. If you have 1 installed how long can the maintenance on this item can be deferred for _____________days per the MEL.
10
The B767 Mel indicates: This category C item 30-1 Landing Gear Retracting System C (M)(O) May be inoperative provided: a) Inoperative components are properly secured by an accepted procedure, and b) Airplane is dispatched in accordance with appropriate AFM Landing Gear Extended Appendix. The maintenance on this item can be deferred for _____________days per the MEL. The ____________________can MEL the item.
10, pilot or mechanic
Electrical systems operate on many different voltages both AC and DCHowever, most of the large transport primarily systems use:
115 VAC @ 400 Hz 28 VDC
What type of Generator does the B767 have?
115VAC 400 hz
The B767 Mel indicates:This category D item 25-2 Passenger Seats 1) Recline Mechanism D - - (M) May be inoperative and seat occupied provided seat back is secured in full upright position. The maintenance on this item can be deferred for _____________days per the MEL. The ____________________can MEL the item.
120 Mechanic
The B767 Mel indicates: This category B item 41-1 Control Wheel Trim Switch Systems B 2 1 (M) One may be inoperative on non-flying pilot's side provided stabilizer trim system is verified to operate normally. The maintenance on this item can be deferred for _____________days per the MEL.
3
The B767 Mel indicates: This category B item 21-1 Passenger Oxygen System B 1 0 (M) May be inoperative provided: a) Flight is not conducted where minimum enroute altitude is above 14,000 feet MSL, b) Both air conditioning packs operate normally, c) All other components of pressurization system operate normally, d) Airplane remains at or below FL 250, e) Portable oxygen units are provided for 10% of passengers, and f) Passengers are appropriately briefed. The maintenance on this item can be deferred for _____________days per the MEL. The ____________________can MEL the item.
3 mechanic
Which of the following dry motoring cycle limits for the CRJ200 CFM34-3B engine is/are correct?
A First cycle 90 seconds on, 5 minutes off (WRONG) A & C
Accumulator
A bladder or cylinder with two parts iwhich serves as a damping device (smooth the flow to avoid pressure surges) it also serves as backup pressure should the pump fail.
Which of the following describes an centrifugal flow compressor?
A compressor with an impeller and rotor
In the CFM 34 - 3B a by-pass engine, how is airflow separated?
A portion of air travels around the engine after travelling through the inlet and the remaining air flows through the core.
A transformer rectifier unit (TRU) is used to convert
AC into relatively smooth DC.
The CRJ200 has seven TRU which change...
AC to DC
Select the correct statements concerning Hydraulic fluid reservoirs?
ALL OPTIONS CORRECT Selected: Contains some reserve in case of a leak; It can be pressurized for aircraft flying at high altitudes; Fluid returning must enter the reservoir without foaming; The fluid can cooled with a fuel heat exchanger
The generators on the engines of the CRJ 200 are
All of the above
The purpose of an aircraft fuel system is to store and deliver the proper amount of clean fuel at the correct pressure to the engine. Fuel systems should provide positive and reliable fuel flow through all phases of flight including:
All of the above
Where does the APU starter receive electrical the power to start?
All of the answers are possible depending on if the aircraft is on the ground or inflight.(WRONG) Normally from the APU DC Battery .
Which of the combustion designs is used to combine and ignite the fuel air mixture for starting the CRJ200?
Annular design which circles the space for the combustion chamber.
Large Transport aircraft systems use several phases of AC power including ___________volts of AC Power for systems such as avionics, lights, radar background lights, etc.
Can be all of the depending on the aircraft
The _______________ is responsible for providing the combustion chamber with compressed air in an efficient manner.
Compressor
Once the air flows through the turbine, it enters the combustion section, also called the combustor. The combustion section has the difficult task of controlling the burning of large amounts of fuel and air.
False
The compressor section of the gas turbine engine has the task of producing usable output shaft power to drive the propeller.
False
What provides power if there is a total loss of AC electrical power in flight caused by loss of all fuel?
From the right side of the forward fuselage an air driven generator (ADG) is deployed to provide AC power.
For a normal engine start for the CRJ 200, which is correct?
ITT at 90*C or more, N2 above 20%
For a normal engine CRJ CFM3b start, you can not attempt another start until...
ITT is at 90*C or less (WRONG) ITT is at 130*C or more (WRONG) ITT is at 120*C or less
Where is the CRJ 200 APU located ?
Inside a fire proof enclosure in the aft equipment bay
___________________is a kerosene grade of which is used widely in commercial jet aircraft. It is produced to a stringent internationally agreed standard, has a flash point above 38°C (100°F) and a freeze point maximum of -47°C.
Jet A -1
___________________is a a wide cut kerosene (a blend of gasoline and kerosene) rarely used except in very cold climates.
Jet b
In the CFM34-3B high bypass, twin spool turbojet engine what order is the N1 spool fan and low pressure turbine in?
Low pressure compressor is behind fan the high pressure compressor and the low pressure turbine is all the way in the back. (WRONG) Fan and the Low pressure compressor is behind the high pressure compressor and the low pressure turbine is in front of the high pressure turbine. (WRONG)
Normal start parameters for the CRJ200 (CFM343B engine) are:
N1 22-25%, ITT 450-600*C, N2 62.9-64%
The accessory gear box is driven by the
N2 rotor
Of the following scenarios, which does not require you to dry motor until ITT is reduced below 120*C according to the QRH?
No lightoff
In the graphic, what is the position of the APU power Fuel switch/valve.
Pump ON/SOV Open
What accessorizes are driven by the APU gear box ?
The AC generator, The FCU ( fuel control unit ) , oil cooling fan, oil pump, and the electric starter
Where does the APU gets its fuel from?
The aircraft main tanks
What is the voltage of the CRJ 200 AC and DC system?
The voltage is 115-volt AC and 28-volt DC electrical power.
What is the voltage of the CRJ 200 DC system?
The voltage is 28-volt DC electrical power.
The gas turbine is an internal combustion engine that uses air as the working fluid.
True
In a turbofan engine, if a conversion from pressure to velocity is needed a ____________duct is shaped like a funnel in reverse ( larger to smaller area), to achieve this.
a convergent duct is used
The B767 Mel indicates: This category A item Cockpit Voice Recorder (CVR) System is an A item with 1 installed and May be inoperative provided: a) Flight data recorder (FDR) operates normally, and b) Repairs are made within __________________days.
a specified number of (found in the remarks section of the MEL)
The fuel for the APU comes from the...
aircraft main tanks
Describe the working flow of a gas turbine engine. The gas turbine... Question 9 options:is an internal combustion engine that uses air as the working fluid.extracts chemical energy from fuel and converts it to mechanical energy.uses gaseous energy of the working fluid (air) to drive the engine and propeller,which, in turn, propel the airplane.all of the above are correct.
all are correct
Typical transport aircraft like the CRJ200 Engine Indicating and crew Alerting system (EICAS) displays & annunciations engine parameters, oil pressure, oil temperature and
all of the above
In the graphic, what source is supplying high pressure air to the packs?
apu
what is required to light the fuel and air mixture in the combustion chamber
at least one ignitor
The CRJ200 Air Driven Generator (ADG) is a last resort when
both engine generators and the APU generators fail.
At what point in a turbine engine are the fuel and air mixed together?
combustion
A large mass of air must be supplied to the turbine in order to produce the necessary power. This mass of air is supplied by the ____________________, which draws the air into the engine and squeezes it to provide high-pressure air to the turbine.
compressor
The heart of the gas Generator consists of these three main components
compressor, combustor, turbine
Transport aircraft can use a _____________________________if the main fuel quantity indicators fail.
drip-less magnetic dipstick
An APU is designed to supply the aircraft with...
electrical and pneumatic power
You arrive at the aircraft and you find the automatic pressure controller is inoperative. This item is a category C item in the minimum equipment list (MEL). If you defer the maintenance on the this component on 6/10/18 at 1pm (1300) when will the MEl expire?
expires at 1201 on the 21st of June
You arrive at the aircraft and you find the automatic pressure controller is inoperative. This item is a category B item in the minimum equipment list (MEL. If you defer the maintenance on the this component on 6/10/18 at 1pm (1300) when will the MEl expire?
expires at 1201am on the 14th
During engine start when there is no rise in ITT after fuel is added (you see a positive fuel flow) is most likely caused by...
failed ignitor
A single stage of axial compression consists of a set of rotating stator vanes to increase pressure followed by rotating blades attached to a rotating disk to diffuse the air.
false
A transport aircraft does not have a backup system, in case a engine driven hydraulic pump fails
false
In a normal start the APU is turned ON after the start button is depressed.
false
In an axial flow compressor, each stage incrementally decreases the pressure from the previous stage, and the airflow is 90 degrees from engine axes.
false
In an axial turbine engine flow compressor, each stage incrementally increases primary heat exchanger air flow before it enters the expansion turbine.
false
In an centrifugal flow compressor, each stage incrementally decreases the pressure from the previous stage, and the airflow is 90 degrees from engine axes.
false
Modern large transports such as the B767 aircraft utilize an electrical starter alternator, which is housed on the ignition gearbox for starting and main power generation.
false
Modern large transports such as the CRJ200 aircraft utilize an electrical starter alternator, which is housed on the ignition gearbox for starting and main power generation.
false
Most large Transport aircraft have DC Generators
false
Once the turbine engine air flows through the diffuser, it enters the combustion section, also called the compressor.
false
Smaller transports, turbo props and aircraft like The Lear 31 and 55 have 115v AC systems which require a pneumatic source for engine starting
false
The B767 APU Powers the Left IDG if the Left engine fails
false
The CRJ200 APU Powers the Left integral drive generator (IDG) if the Left engine fails
false
The basic 4 steps for any internal combustion engine are:1. Intake of air (and possibly fuel).2. Compression of the air (and possibly fuel).3. Combustion, where fuel is injected with the intake air and burned to convert the stored energy.4. Expansion cooling is exhausted to water separator
false
The gas turbine is an external combustion engine that uses air as the working fluid to create thrust through the rotation of the compressor.
false
The inverter converts AC to DC power for standby operations
false
The main function of the turbine in the turbofan engine is to create thrust.
false
The primary function of a hydraulic fluid is to provide lubrication in the engine and decrease vibration.
false
The turbocharger is typically housed inside a turbine engine that contains a small turbine connected by shaft to a compressor. Aircraft exhaust is sent directly into the combustion chamber, where the turbine converts it into heat energy which in turn spins the impeller wheel and compresses exhaust air.
false
Transport Hydraulic systems use Skydrol which is a red mineral based fluid.
false
The compressor section of the gas turbine engine has the task of producing usable output shaft power to drive the propeller.
false (the turbine section)
Where does the APU starter receive the power to start?
from a dedicated battery
When starting a turbine engine and the ITT rises rapidly well beyond the start limits. This is called a ...
hot start
During a typical turbine engine engine start when there is no rise in ITT after fuel is added (you see a positive fuel flow) is called a?
hung start(WRONG) n2 stagnation (WRONG) no lightoff
Should all the engines fail in flight the pilot will deploy a propeller-driven electric generator called a Ram Air Turbine (RAT) which is concealed under the fuselage. This provides electrical power for the...
hydraulic pumps and control systems as power is no longer available from the engine driven generator.
Which components are on the N2 spool of a triple spool engine?
intermediate pressure compressor intermediate pressure turbine
The CRJ 200 APU has the exact same generator as the engines which...
is attached to its accessory drive
In the graphic, where is the high pressure air sourced from?
left and right engine
In the graphic, where does the APU get its fuel from?
main tanks
Hydraulic power is generated
mechanically, electrically and pneumatically
Actuators
moving part of the hydraulic system, which converts pressure into a mechanical movement to do work.
The CRJ aircraft's __Nicad battery is the final source of backup power.The battery provides ____________ power.
nickel cadmium, DC
What effect does a failed ignitor have on starting the aircraft turbine engine?
no increase in ITT
In the graphic, what is the position of the APU load control valve.
open
The APU power fuel valve must be _______________to start the APU.
open
Transport aircraft use __________________fuel systems...
pressure Refuel/Defuel
Pressure regulator
prevents damage and helps to keep pressure at limits of system (from required reading in text)
If the free turbine (turbo prop) engine power turbine failed this may cause operational problems associated with the....
prop
quiz 2
quiz 2
Jet B is a a wide cut kerosene (a blend of gasoline and kerosene) and is ...
rarely used except in very cold climates on ferry flights only.
When starting a CRJ200 turbine engine how do we add fuel for starting?
release full cutoff button and move the thrust lever forward
You arrive at the aircraft and you find the automatic pressure controller is inoperative. This item is a category D item in the minimum equipment list (MEL). If you defer the maintenance on the this component on 6/10/18 at 1pm (1300) when will the MEl expire?
shall be repaired within 120 days not including 6/10/18.
You arrive at the aircraft and you find the automatic pressure controller is inoperative. This item is a category A item in the minimum equipment list (MEL). If you defer the maintenance on the this component on 6/10/18 at 1pm (1300) when will the MEl expire?
shall be repaired within the time interval specified in the remarks column of the operator's approved MEL.
You arrive at the aircraft and you find the automatic pressure controller is inoperative. This item is a category A item in the minimum equipment list (MEL. If you defer the maintenance on the this component on 6/18/18 at 1pm (1800) when will the MEl expire?
shall be repaired within the time interval specified in the remarks column of the operator's approved MEL.
Which condition is most likely to cause a fuel imbalance on a transport aircraft.
single engine taxi
On a twin spool engine, The N1 and N2 shafts are connected by a...
they are independent
CRJ 200 How many hydraulic systems are there?
three
26 VAC is also used in some aircraft for lighting
true
A turbine drives the compressor section of a turbine engine.
true
In a turbofan engine, the size and shape such as convergent or divergent, of the ducts through which the air flows affect various changes.
true
In everyday terms (and for fluids only), viscosity is "thickness" or "internal friction".
true
In the image attached, the AC External Power is ON.
true
Main system hydraulic pressure for most Transport Systems is 3000 psi.
true
Most modern transports such as the 777 has transformer rectifiers and Integral Drive Generators.
true
Most transport aircraft can use the APU while in flight as a backup power source,
true
The Low Pressure turbine is connected to the low pressure compressor via a shaft.
true
The air inlet duct must provide clean and unrestricted airflow to the engine.
true
The basic principle of the airplane turbine engine is 1. Intake of air 2. Compression of the air 3. Combustion, where fuel is injected and burned to convert the stored energy.4. Expansion and exhaust, where the converted energy is put to use to drive compressor.
true
The battery bus (Hot Bus) is always powered.
true
The convergent duct operates in reverse of the divergent duct.
true
The gas turbine is an external combustion engine that uses air as the working fluid to create thrust through the rotation of the compressor.
true
The inverter converts DC to AC power for standby operations
true
The main function of the turbine in the turbofan engine is to drive the associated compressor spool.
true
The primary function of a hydraulic fluid is to convey power.
true
The static inverter changes DC to AC
true
The turbine section of the gas turbine engine has the task of producing usable output shaft power to drive the compressor and all engine accessories. It does this by expanding the hightemperature, pressure, and velocity gas and converting the gaseous energy to mechanical energy in the form of shaft power.
true
