UH60 Systems
Utility Module has a Velocity Fuse that shuts off hydraulic fluid flow to the accumulator if flow rate exceeds ___ gallon per minute (gpm). Normal flow rate is ___ gpm.
1.5 1
The cargo hook can be used to carry external loads of up to how many lbs. in a standard configuration?
8,000
The forces required to break through the clutch are __ pounds maximum in yaw and __ pounds maximum in roll. (Even though its not written, __ pounds for pitch)
80, 13, 20
FUEL PRESS caution appears when pressure drops below __ PSI.
9 PSI
With one engine operating, what *Ng* must be maintained to crossbleed start the other?
90% or greater
The __________ enhances the stability and handling qualities fo the helicopter.
Automatic Flight Control System (AFCS)
STAB: Fault monitoring will not allow reengagement, if ______ are still present.
Faults
A _________ on the inside of the hydraulic pump shears to prevent any damage to the accessory modules In the event of mechanical failure.
Shear Shaft
Is the APU capable of starting both engines simultaneously?
Yes, with certain ambient temp
The oil cooler (liquid to liquid) has 1 primary function and one passive, they are?
primary: oil cooling passive: anti ice
Which light mounted underneath the nose can actually be rotated 360°?
searchlight
The helicopter has a variable angle of incidence _______ to enhance the longitudinal handling qualities of the aircraft.
stabilator
The APU provides pneumatic power for main engine _____ and cabin heating, and electrical power for _____ and __________ electrical operations.
start, ground, emergency in flight
The ice detector senses ice accumulation on a ___________ by change in the probe frequency.
vibrating probe
__________ prevent both primary servo stages from being turned off simultaneously.
Electrical Interlocks (hard wired feature)
3 HYD Malfunction Types
Leaks, Mechanical, Jams
This minimizes inherent control coupling by combining, summing, and coupling cyclic, collective, and yaw inputs.
Mechanical Mixing Unit (MMU)
What are the four modules of the engine can be associated with two sections, *Ng* and *Np*?
Ng Section: Cold, Hot, Accessory Np Section: Power Turbine
What are the two operational sections of the engine?
Ng and Np
Inlet air temperature information from the T2 sensor is also used for _________. Ng section generates power in the form of gas pressure to drive the _________.
Ng limiting Power Turbine (Np)
__ makes power and drives __, which is connected tot he main module via the input modules and mechanically drives the rotor system.
Ng, Np
What are the four components on/within the transfer module?
Pri Shutoff, Sec Shutoff, Transfer Valve, Pump Press Switch
What happens when alternator power to ECU is lost?
loss of % RPM 1 or 2 and % TRQ with corresponding engine increasing to max power (high side)
What happens when Ng signal is lost?
loss of Ng cockpit indication with corresponding ENG OUT warning and audio
Flight Path Stabilization (basic auto pilot) operates by Trim/FPS providing ________ and force gradient with the pitch, the roll and yaw trim actuators.
control positioning
The FPS function below 60 knots is to maintain helicopter pitch and roll attitudes and heading hold. Above 60 knots heading hold will automatically disengaged, and _____________ engaged under these conditions.
coordinated turn feature
HYD Leaks - any component in the respective system. What cautions appear?
#1 RSVR LOW and BACK-UP RSVER LOW
The Pilot's Assist is normally pressurized by what hydraulic system?
#2
All sources of AC power except the #1 GEN, supplies power to what bus?
#2 AC PRI BUS
What component has a conductor that melts at a relatively low temperature when excessive amps flow through it?
current limiter (which is basically a fuse)
Any HYD RSVR LOW indicates?
fluid has dropped below about 60%
The APU's hydraulic accumulator is utilized to start the APU using ______ fluid.
hydraulic
The appearance of the *SAS OFF* caution light indicates a lack of ______ pressure to the SAS actuators.
hydraulic
In reference to the WOW switch, the acronym "WOW" stand for __________.
weight on wheels
What is the *operation times (reserve capacity)* of the *SLAB* assuming 80% capacity?
*Day - 38 min* *Night - 24 min*
For internal loads what is the cabin floor capacity per square foot?
300lbs
The stabilator is programmed to provide (_____) while in the Auto Mode.
*SCALP* S - Streamline C - Collective Coupling A - Angle of Incidence L - Lateral Sideslip to Pitch P - Pitch Rate Feedback
The *Under Frequency Protection* function of the GCU is provided during _______ _______ only.
*ground operations* It is disabled in flight by the WOW switch.
During preflight for a flight less than 6 hours where must the oil level be?
above the add line
Transfer Modules allows the ________ to take over.
backup pump
The *Np* section can be thought of as a "____________".
"drivetrain component"
The *Ng* section can be thought of as "____________".
"the engine"
HYD Mechanical - Pumps. What cautions appear?
#1 HYD PUMP
What caution appears if the No. 1 hydraulic pump pressure is lost?
#1 HYD PUMP
HYD Jams - Servos. What cautions appear?
#1 PRI SERVO PRESS, #1 TAIL RTR SERVO
Five conditions that trigger Backup HYD PUMP.
#1 Pump, RSVR LOW, Tail RTR Servo #2 Pump APU ACCUM LOW
*What bus is powered simply by plugging in the battery?*
*BATT UTIL*
*With the loss of #1 and #2 converters, what bus(s) do you lose?*
*DC PRI BUS(s)*
What are the three interchangeable dual (two-stage) primary servos that position the main rotor?
1) Forward 2) Aft (middle) 3) Lateral (left)
What are the three separate sets of windings on the alternator for, their functions?
1) Ng signal 2) ECU/DEC power 3) Ignition Power
What are the four functions of the Pressurizing and Overspeed Unit (POU)? (on newer engine its the Overspeed and Drain Valve ODV)
1) Sends fuel to the primer nozzles and main fuel manifold. 2) Uses P3 air to purge primer after light off. 3) Uses P3 air to purge primer and main fuel manifold on shutdown. 4) Controls Np overspeed.
HYD System Leak Sequence
1) Shuts off furthest system If the PUMP fails: 2) Restores system and Backup Pump powers that whole system. If BACKUP RSVR LOW: 3) Shuts off PRI SERVO
The AFCS is comprised of four basic subsystems:
1) Stabilator 2) Stability Augmentation System (SAS) (Dynamic) 3) Trim (Static) 4) Flight Path Stabilization (FPS) (autopilot)
What are the Generator Control Units (GCUs) six functions?
1) Voltage Regulation 2) Over Voltage 3) Under Voltage 4) Current Limiting 5) Under Frequency Protection 6) Feeder Fault
How does engine oil cooling occur?
1) liquid to liquid 2) scroll vanes
The drag beams will absorb energy from landings up to __ feet-pre-second (fps). Above 10 fps the upper stage and lower stage combine to absorb loads up to 39 fps (about ____ Gs).
10 fps, 11.25 Gs
If both cables fail, the TAIL ROTOR QUADRANT caution will appear and no tail rotor control will be available. Centering springs will position the tail rotor servo linkage to provide ___ degrees of pitch.
10.5°
How many G's can the UH-60's main landing gear can absorb without damage to the airframe?
11.25 G's
Maximum capacity for each storage compartment is ________.
125 pounds
Pitch Trim Override = __ lbs of force Yaw = __ lbs of force Pitch Hardover = ___" Yaw Hardover = ___"
13lbs 80lb 1/2" 1/4"
A collective boost hardover will increase force as much as ___ pounds.
150
With engine anti-ice activated how much should Maximum TQ available be reduced?
16% plus 4% for cockpit and gunner
How many indicator buttons are on each hydraulic pump?
2
On the transfer module there are __ shutoff valves.
2
What is the minimum crew for the UH-60 Blackhawk?
2 Pilots
The APU gage should read ____ PSI on preflight for starting of the APU.
2,800 PSI
A pitch boost hardover will increase force by approximately ___ pounds.
20
The tail rotor is canted ___ degrees to improve performance and increase lift capability. The cant provides approximately ___% of the total lifting force for the aircraft.
20°, 2.5%
What is the maximum gross weight for the UH-60A?
22,000 pounds
What is the maximum gross weight of the UH-60A with all current MWO's applied and 14 lug wheels without ESSS?
22,000 pounds
When Np exceeds ______ RPM, output from the protection system activates a solenoid in the POU, reducing fuel flow.
22,200 ±200 RPM
The main rotor blade is __ feet __ inches in length.
24' 4"
A yaw boost hardover will increase force as much as ___ pounds.
250
Main Rotor Speed (RPM R) at 100% RPM R is equal to ____ RPM (actual)
258 RPM
How many first aid kits are installed in the UH-60?
3
There are ___ hydraulic pumps on the UH-60 to service our hydraulics for the flight controls. We refer to these pumps as?
3 #1 Pump, #2 Pump and Backup Pump
*Note* A slight amount of collective friction (approx. __ pounds) should be used to prevent pilot induced collective oscillations.
3 pounds
The engine has 6 bearings located in _______________ that are lubricated by scavenged oil.
3 sumps A, B & C
The backup hydraulic system is operated by a?
3-phase 115 Volt AC motor
The tail wheel swivels ___ degrees on a yoke assembly when unlocked.
360°
Collective/Airspeed to Yaw provides maximum coupling at or below __ knots and no coupling above ___ knots.
40, 100
When ground taxing, the UH-60 requires __ feet __ inches of tail rotor clearance for a ___ degree turn.
41' 7.7" 180°
The compressor is arranged with a __ stage axial compressor and a __ stage centrifugal impeller.
5 stage axial 1 stage centrifugal
SAS I and II have __% control authority for a total of __% control authority.
5%, 10%
The HMU (Hydromechanical Unit) has 9 functions, the two highlighted in class are:
5) Ng limiting and Ng shutdown (max. Ng at 103%, shutdown at 110%) 6) Variable Geometry positioning (IGV, variable vanes, and AISBV)
At what *Ng* should the starter caution disappear?
52-65% Ng
The UH-60 rotor diameter is __ feet __ inches.
53' 8"
When pressure refueling there is a maximum refuel pressure of ___ PSI at a flow rate of ___ GPM.
55 PSI, 300 GPM
When the Ng display on the CDU indicates __% Ng speed, the ENGINE OUT warning and audio will activate.
55% Ng
If flights over ___ hours are made, engine oil level must be at the full line of the sight glass before flight.
6
Pedals release yaw trim at airspeeds less than __ knots.
60
The Stabilator TEST Switch feature is inop above __ KIAS.
60 KIAS
The main transmission has built-in ___ degree forward tilt for a level attitude in cruise flight.
7
The oil tank is integral with the engine and has a __ quart capacity.
7
Where is the oil drawn from for the emergency oil system?
A and b sumps
The ___ is used for normal engine starts.
APU
What powers the auxiliary AC electrical system?
APU
Only the backup pump can supply hydraulic pressure to the ____ and ____.
APU ACCUM and the #2 TAIL RTR SERVO
The stabilator has two muscles or ____ and two brains or ____.
Actuators and Amplifiers (DSC)
STAB Auto Mode: Streamline
Align stabilator and main rotor downwash in low-speed flight to minimize nose-up attitude resulting from rotor downwash.
The amount of electricity that passes through a wire is measured in ______.
Amps
When the APU ACCUM LOW advisory appears, hydraulic logic will bring on the back-up hydraulic pump if the BACK-UP HYD PUMP switch is in which position?
Any Position, regardless of in flight or on the ground.
What provides electrical power for the aircraft startup and secondary or emergency DC power?
BATT
What hydraulic system's provides pressure to the 2nd stage TAIL RTR SERVO?
Backup Pump
The collective and yaw boost servos are turned on and off by pressing the switch marked ______ on the AFCS panel.
Boost
Which doors can be jettisoned as an emergency exit?
Cockpit Doors only
The brains (amplifiers) of the stabiliator miscompare what four signals? (*CLAP*)
Collective Stick Position Transducers Lateral Accelerometers Airspeed/Air Data Transducers Pitch Rate Gyros
Main types of mixing provided by MMU.
Collective to Pitch Collective to Roll Collective to Yaw Yaw To Pitch
The mixing unit provides forward input to the main rotor as collective is increased and aft as its decreased. This is an example of?
Collective to Pitch (mixing)
The mixing unit provides left lateral input to the main rotor system as collective is increased and right lateral input as collective is decreased. This is an example of?
Collective to Roll (mixing)
The mixing unit increases tail rotor pitch as collective is increased and decreases tail rotor pitch as collective is decreased. This is an example of?
Collective to Yaw (mixing)
This mixing is in addition to collective to yaw mechanical mixing. It helps compensate for the torque effect caused by changes in collective position. This is an example of?
Collective/Airspeed to Yaw (electronic coupling)
Where is the Servo shut off switch located?
Cyclic
What DC busses are not powered by the battery?
DC PRI BUS
STAB Auto Mode: Angle of Incidence
Decrease angle of incidence as airspeed increases to improve static stability.
What does the FLT PATH STAB advisory indicate?
FPS is inop in one or more axis
What device converts mechanical energy into electrical energy? And vise versa?
Generator, Motor
It controls fuel to the combustion system. It is mounted on the rear center of the accessory gear box. It contains a high pressure pump that delivers fuel to the Pressurizing and Overspeed Unit.
Hydromechanical Unit (HMU)
The ___ removes sand, dust, and other foreign material from the engine inlet air. It does NOT do a good job during IDLE, Startup or Shutdown (low RPM).
Inlet Particle Separator (IPS)
The engine inlet anti-ice automatically activates between what temperature ranges?
Less the 4° On 4-13° may or may not
The ___ is connected to the aircraft COLLECTIVE linkage on the Mechanical Mixing Unit (MMU)
Load Demand Spindle (LDS)
#1 and #2 HYD PUMPs are driven by?
Main Rotor % RPM R
Where is the TAIL SERVO switch located?
Misc Panel
The Engine Driven Fuel Boost Pump is designed to suction fuel from the selected fuel cell and feed fuel to the HMU, this suction is known as __________.
Negative Pressure
Is the *Ng* section mechanically connected to the *Np* section?
No
Blue harness is dedicated to the __________________.
Np Overspeed and torque indication systems
If alternator power is lost to the engine, will the ECU still remain functional?
Np overspeed an history recorder will (work off AF power)
What are the four positions of the PCLs?
OFF, IDLE, FLY, LOCKOUT
What are the three positions of the BACKUP HYD PUMP switch?
OFF, ON, AUTO
What does the HSP automatically prevent?
Over temp during start
What is the final caution/advisory to appear for a primary servo jam?
PRI SERVO PRESS
The _____ boost servo is turned on and off by pressing one or both SAS buttons marked SAS 1 or SAS 2 on the AFCS panel.
Pitch
The stabilator works only on the longitudinal axes which is can also be reffered to as?
Pitch
The tail servo moves the __________ change shaft that extends through the tail gear box to the pitch change links, to the tail rotor blade paddles.
Pitch, Pitch Beam
SAS enhances dynamic stability and provides short-term rate damping in the ____, ____, and ____ axis.
Pitch, Roll, Yaw
The ___ is connected by cable to the ENG POWER CONT lever in the cockpit.
Power Available Spindle (PAS)
STAB Auto Mode: Lateral Sideslip to Pitch
Provide (lateral)sideslip to pitch coupling to reduce susceptibility to gusts.
STAB Auto Mode: Collective Coupling
Provides collective coupling to minimize pitch attitude excursions due to collective inputs from the pilot.
Pictured (on answer side) is a good blade inspection method (BIM) indication. What color would a bad BIM indication be?
Red
The Flight Path Stabilization (FPS) system provides basic autopilot functions: < 60 kts FPS Axis > 60 kts
Refer to Image (chart) *must know*
Malfunction of the _______ system may be detected by the pilot as an erratic motion in the helicopter without a corresponding failure advisory indication.
SAS I
The _____ computer provides fault monitoring for SAS II.
SAS/FPS
AFCS is a basic computer system comprised of ____, ____, and ____.
Sensors, Processors, Actuators
AFCS is comprised of four basic subsystems:
Stabilator, SAS, Trim, FPS
What does AFCS provide the UH-60 helicopter?
Stability and Handling
Flight Path Stabilization (FPS) uses ____ actuators to provide control positioning / basic autopilot functions.
Trim
When the _____ switch is "on", the system provides gradient and detent holding force for pitch, roll, and yaw.
Trim
How many independent generating systems provide *primary* AC power?
Two
What landing gear component causes the back-up pump to come on automatically even when the BACKUP HYD PUMP switch is off?
WOW switch
The mixing unit provides aft input to the main rotor system as tail rotor pitch is increased and forward input as tail rotor pitch is decreased. This is an example of?
Yaw to Pitch (mixing)
The FLT PATH STAB caution/advisory will remain on until the pilot does a?
power on reset
Amount of oil between the ADD and FULL indicators is?
about 2 qrts
What is the maximum weight on the service platform located on the inside of the engine cowlings?
at least 250lbs and up to 400lbs as placarded on the aircraft
The gust lock prevents the _____ from rotating when the helicopter is parked.
blades
If acceleration is continued or collective is ______ with the stabilator in a trailing edge down position, longitudinal control will be lost.
decreased
Yellow harness connects circuits that are dedicated solely to ____________.
engine electrical functions
The black harness id dedicated to ___________.
engine ignition
The green harness functions as an ________________.
engine to airframe interface
The ___________ located inside of the input module allows engine disengagement from the rotor system during an autorotation.
freewheel unit
What drives the accessory gear box?
gas generator at variable speeds
Each accessory module provides mounting and drive for a _______ and ___________.
generator and hydraulic pump
What are the three methods of refuel for the UH-60 Blackhawk?
gravity, pressure and closed circuit
Trimmed flight is available at 25 kias to 145 kias. (This speed will vary depending on ____________).
gross weight
The backup hydraulic pump provides hydraulic pressure in case of failure of the #1 and/or #2 hydraulic pumps and for _____________.
ground operations checks
*Warning* To prevent _______ to personnel, do not release either the normal or emergency vertical adjust levers unless someone is sitting in the seat.
injury
The ______ takes the power from the engines and transmits it to the main transmission while changing drive angle and reducing RPMs.
input module
How does the oil system overcome high pressure during cold starts?
oil filter bypass and oil cooler bypass
*Caution* Landing and searchlight have less than _____ ground clearance when extended. Use caution when taxiing over rough terrain when landing light and/or searchlight are extended.
one foot
The transfer valve allows ____ one ____ to provide hydraulic pressure to the system at a time.
only, pump
SAS provides *dynamic* stability in the ____, ____, ____ axes.
pitch, roll, and yaw
The flight path stabilization (FPS) provides *static* stability in the ____, ____, ____ axes.
pitch, roll, and yaw
The TEST button on STAB CONT does what?
tests the fault monitor system (you manually test the STAB, that is not what the TEST button does)
Pulling the emergency release handle on the cargo door will release what?
the cargo door windows