EXAM 2 Flashcards
- Which flight control allows the pilot to counteract main rotor torque and control the helicopter around the yaw axis?
Pedals
- What component transmits the pilot’s flight control movements to the hydraulic actuators?
flex-ball cable
- When pushing right pedal, the thrust/ pitch of the tail rotor thrust is _______ causing the nose of the a/c to turn right.
decreased
- When pushing left pedal, the thrust/ pitch of the tail rotor thrust is ________ causing the nose of the a/c to turn left.
increased
- When pushing right pedal, which direction will the helicopter turn around the yaw axis?
right
- Select the correct button on the cyclic:
SAS ON (Stability Augmentation System On) is a 4-waytoggle used to (re)engage the pitch/roll/yaw backup SAS
left of reset
- Select the correct button on cyclic:
SAS/AP CUT (Stability Augmentation System / Autopilot Cut) disengages the SAS (3-axis backup SAS) and AFCS simultaneously
On the left and you know it!
- Select the correct button on the cyclic:
AP MD DCPL (Autopilot Mode Decouple) cancels all upper modes and reverts to ATT mode when pressed for less than 1 second
:)
- What sub component of the number 2 hydraulic system boosts the control signals from the pedals to reduce pilot workload.
actuator
- Which component drives the hydraulic pumps?
Main Transmission
- What are the CAUTIONS associated with operating the hydraulic test switch?
HYD Test switch ____ _____ ____ operated during flight. Observe _ _ limits during hydraulic test.
must not be, mast moment
- The cyclic controls _______ attitude with fore and aft movement of the cyclic and the left and right tilt of the main rotor with lateral (left and right) movement.
pitch
- Select the correct button on the collective:
Go-Around (GA) mode button, used in case of a missed approach.
left lower button on collective
- Select the correct button on the collective:
4-Way directional control switch that extends and retracts the searchlight.
middle lower 4-way button
- What component acts as the yaw Stability Augmentation System (SAS) for the UH-72A, increasing aircraft stability by damping disturbances due to wind, turbulence.
Smart Electro-Mechanical Actuator
- Which flight control changes the blade pitch equally on all four main rotor blades?
Collective
- The component depicted in the graphic below increases hydraulic fluid pressure to provide the forces to move the actuators.
What is the component.
Hydraulic Pump
- Select the correct button on the collective:
Landing on search light switch (on/off)
Upper Right
- When pushing left pedal, which direction will the helicopter turn around the yaw axis?
left
- Which component transmits flight control signals from the swash plate to the main rotor blades?
Pitch Change Link
- Select the correct button on the collective:
Wiper switch, allowing for a single swipe of the wiper blade.
Wiper button
- Are cyclic and collective control inputs independent of each other?
Yes
- During extended ground operations, and while conducting the Automatic Flight Control System (AFCS) Test during run-up, the collective must be secured with the _________________.
Collective lever lock
- Which flight control allows the pilot to change the pitch and roll (bank angle) of the aircraft?
Cyclic
- The three types of flight controls used to fly the helicopter are the [1] , [2], and the [3].
- cyclic
- collective
- pedals
Order not relevant
- Select the correct button on the cyclic:
RESET pushbutton enables the pilot to acknowledge each caution (CAD indication and master caution light).
Yep. red and long
- Select the correct button on the collective:
4-Way switch used to adjust engine trim when operating in the manual mode (MAN mode) only.
lower right button
- Which component transmits the three amplified main rotor control signals to the swashplate?
Mixing Lever Assembly
- Which hydraulic system boosts the tail rotor controls?
2 System
- Which axis of the helicopter does the cyclic control?
[1] and [2] or [3] and [4]
- pitch
- roll
- lateral
- longitudinal
- Which component provides a constant resistance in the pedals to prevent over-control of the tail rotor?
Yaw Brake
- Select the correct button on the cyclic:
FTR (Force Trim Release) opens both cyclic stick parallel actuator clutches to release stick forces
Think harder. You got this
- The SEMAs provide the actuator input for the _____ to dampen dynamic and atmospheric disturbances? (Abbreviated Answer)
Stability Augmentation System
- What system provides attitude hold in the helicopter?
Autopilot
- Place the 5 levels of AFCS control in the proper sequence
- Unstablized (no AFCS or autopilot on)
- Back-up SAS (SAS actuators on only)
- Digital SAS (autopilot on - trim motors off)
- Autopilot (attitude retention)
- Autopilot (upper modes)
- Pressing the [a] / [b] [c] switch on either cyclic will switch from Level 4 Attitude Hold to Level 1 Unstabilized.
a. SAS
b. AP
c. Cut
- In Level 1 Unstabilized, pressing the SAS ON button on the cyclic will move the system to level 2 Backup SAS.
True
- The UH-72 AFCS controls the [a], [b] and [c] making it a 3 axis system.
a. pitch
b. roll
c. yaw
- AFCS Levels [a] and [b] allow for hands off flying?
a. 4
b. 5
- Identify the operational differences between the Stability Augmentation System (SAS) and Trim System (Parallel Actuators) by matching the characteristic to its corresponding system.
a. Has the capacity for full flight control authority
b. Pilot can see and feel flight control inputs
c. Allows for hands-off flight
d. Has limited flight control authority
e. Pilot cannot see or feel flight control inputs
f. Does not allow for hands-off flight
a. Trim
b. Trim
c. Trim
d. SAS
e. SAS
f. SAS
- What system is used for basic stabilization of helicopters?
Stability Augmentation System
- The basic structure of the AFCS consists of three types of components.
A -> B -> C -> A (cycle)
A. sensors
B. computers
C. actuators
- Match the correct term with it associated button or switch
- SAS/AP Cut
- SAS On
- Force Trim Release (FTR)
- Beep Trim
- APP MD DCPL
- GA (Go around)
- -> C (Disengages both, the back-up SAS AND AFCS simultaneously)
- -> D ((Re)engagement of P/R/Y back-up SAS
- -> F (Opens both cyclic stick parallel actuator clutches to release the stick forces and if autopilot is active, sets the new reference for the autopilot’s auto trim function)
- -> E (Modifies the attitude reference ATT MODE. Modifies IAS, ALT, ALTA, HDG, GA or VS reference when the respective upper mode is engaged)
- -> A (Cancels all upper modes and reverts to ATT mode)
- -> B (Used in the event of a missed approach, acquires and holds a vertical speed of 1000 ft/min. After 10 seconds, the mode automatically reverts to the VS mode
- Which switch on the cyclic is a 4-way toggle switch that allows the pilot to modify the attitude reference when operating in ATT (Attitude) mode?
Beep Trim
- Which cyclic switch is used to turn off the backup SAS?
SAS/AP Cut Switch
- The backup SAS is turned on when the [a] switches are turned on or by pressing the [b] switch on the cyclic
a. avionics master
b. SAS On
- What AFCS system makes inputs that cannot be seen in the flight controls?
Stability Augmentation System
- What button on the cyclic must be pressed to move the system from Level 5 Upper Modes to Level 4 Attitude Hold?
AP MD DCPL
- In Primary Phase the UH-72 will be flown in Level 3 with FTR off. To select level 3 the AFCS must first be in Level [a] then press the [b] switches on the APMS followed by the [c] switch located on the [d].
a. 4
b. Trim
c. Force Trim Release
d. Instrument Panel
- Low natural stability of a helicopter requires a _______ _______ of the pilot?
high workload
- Pressing the SAS/AP CUT switch on the cyclic will take you to what Level?
1
- A logbook entry and maintenance action are required to be performed when the mast moment indicator reaches a level greater than [a] %
77
- If the magnetic oil drain plug installed on the intermediate transmission detects metal particles, will a chip light will illuminate in the cockpit to notify the pilot?
No
- The lift and propulsion required for flight are generated by the [a] [b] [c].
a. Main
b. Rotor
c. Blades
- The [a] [b] prevents a reverse power flow from the main transmission to the engines.
a. Freewheeling
b. Unit
- Unlike many Army helicopters that have a fully articulated main rotor system, the UH-72 has what type of rotor system?
Rigid
- The [a] [b] system permits stopping of the main rotor as quickly as possible after the engines have been shut down.
a. Rotor
b. Brake
- When the rotor RPM is below 70%, the mast moment indication is depicted by a [a] scale ; what type of scale?
Linear
- On preflight, the oil level of the main transmission is checked via the [a] [b].
a. sight
b. glass
- Refer to the graphic below to identify the main components of the UH-72A Lifting System. Match the component picture to its name.
A. (4 blades are attached)
B. (generates lift)
C. (Reduces RPM)
D. (Reduces Rotor Speed)
A is 3. Main Rotor Head
B is 4. Main Rotor Blades
C is 1. Main Transmission
D is 2. Rotor Brake System
- If the magnetic oil drain plug installed on the tail rotor transmission detects metal particles, will a chip light will illuminate in the cockpit to notify the pilot?
No
- The primary purpose of the tail rotor is to [a] the torque effect of the [b] rotor
a. counteract
b. Main
- What actions are required of the pilot if the pop-up indicator pin is found “popped” on preflight?
You must make a [a] and [b].
a. write up
b. notify maintenance
- The main gear is driven by the two engines and drives the main rotor, tail rotor, and accessories. The main transmission reduces the input RPM of the two engines to the required output RPM for the [a] [b] and [c].
a. main rotor
b. tail rotor
c. accessories
- Transmission oil pressure and temperature indications are displayed on [a] of the [b].
a. Lane 2
b. VEMD
- What component changes the power flow coming from the main transmission to the tail rotor gearbox?
Intermediate Gearbox
- To ensure oil circulation in the event of clogging, the oil filter assembly for the main transmission incorporates a [a] with an indicator button.
bypass
- Which of the following design characteristics best describes how blade flap and lead-lag movement are accomplished?
The elasticity of the blades
- Which component reduces the engine output speed and transmits power from the engines to the main and tail rotor systems?
[a] [b]
a. Main
b. Transmission
- Do not operate the rotor brake until both engines are [a] and the rotor RPM (NR) is below [b]%
a. shut down
b. 50
- The caution “MM EXCEED” will illuminate on the Caution and Advisory Display (CAD) if the mast moment exceeds [a].
77%
- Which system measures and indicates any bending moments occurring on the rotor mast?
[a] [b] [c]
a. Mast
b. Moment
c. Indicator
- When the rotor RPM is above 70%, the mast moment indication is depicted by a [a] scale ; what type of scale?
a. Circular
- The operational advantage of having a transmission with a “[a]” type Lubrication System is that the system consists of two identical lubrication circuits; if one circuit fails the other continues to lubricate the entire transmission system.
Redundant
- In forward flight, the Delta hinge system allows for [a].
Flapping
- Which audio warning is the only audio warning that cannot be suppressed by the RESET switch on the cyclic?
a. Rotor
b. Overspeed
- What component changes the direction of the power flow coming from the intermediate gearbox to the tail rotor assembly?
Tail Rotor Gearbox
- If this caution (XMSN CHIP) is displayed on the CAD it means that the [a] oil is contaminated by [b] particles.
a. Main transmission
b. metal
- What are the three main sub-systems of the Electrical System?
Electrical power [a] system.
Electrical power [b] system.
Electrical power [c]
a. Supply
b. Distribution
c. Consumers
- During engine start, if the BAT DISCH caution illuminates on the CAD, what corrective action is required?
- No action is required - it’s normal during engine start.
- Which component converts mechanical energy to electrical energy?
Generator
- Momentarily placing the BAT MSTR switch to the ENGAGE position connects the battery to the [a] and [b].
a. Main Bus 1
b. Main Bus 2
- Which component recharges the battery when the engines are running?
[a]/[b]
a. Starter
b. Generator
- A separate power module (battery) supplies 24 VDC as emergency power for the emergency lighting system and the [a] .
Standby Horizon
- In the event of a dual generator failure both the Non-essential and Shed Buses are disconnected from the electrical system. Which of these buses can be reconnected to electrical power from the battery using an overhead switch?
Shed Bus
- Which components supply electrical power to the UH-72?
- Starter/ Generators
- External Power Unit
- Battery
- Which component converts stored chemical energy to electrical energy?
Battery
- The starter-generator automatically transitions from start mode to generator mode when engine N1 speed exceeds [a]%?
40
- On engine start, the ENG START switch disengages at 40% N1, and the generator is automatically connected to the electrical system when N1 is > ______%?
40
- Electrical power consumers are divided into which 3 busses?
- Shed Bus
- Essential Bus
- Non-Essential Bus
- What is the primary function of the GCU (Generator Control Unit)?
a. Voltage
b. Regulation
- An External Power Unit (EPU) is used for engine start if battery power is less than __________ VDC.
23.5
- When operated by the battery, how many VDC (Volts DC) does the electrical power supply system supply to the airborne electrical system?
24
- To prevent the starter from overheating when using the battery to start the engine, limit starter to [a] seconds of activation.
30
- When operated by the generators, how many VDC (Volts DC) does the electrical power supply system supply to the airborne electrical system?
28.5
- The minimum power required to start the UH-72A is [a] Volts?
23.5
- How many stages of compression in the engine’s N1 Section.
2
- The two sections of the fuel control unit are the [a] control and the hydro-[b] control.
a. manual
b. mechanical
- What is the function of the engine control system?
- To keep the rotor speed constant under all operations
- To allow manual control of the fuel flow for starting and in case of fuel control failure
- Refer to the Engine Module graphic and Components List to match each component labeled on the graphic
A. Axial Compressor
B. Gas Generator
C. Power turbine
D. Transmission Shaft & Accessory Gearbox
E. Reduction Gearbox
- [a] air is used to aid in start injector ventilation, prevent compressor stalls, and provide cabin heat.
Bleed
- When the (4 way beeper) switch is moved to the left the power of enigne #1 is [a] , while the power of engine #2 is [b] , and the [c] RPM remains constant.
a. increased
b. decreased
c. rotor
- What conditions must exist to activate the engine fire extinguishing system?
Select all that apply.
- EMER OFF switch released
- N1 RPM of the respective engine less than 50%
- BOT1/BOT2 switch depressed
- FIRE warning on
- The engine trim 4 way beeper switch on the pilot’s and co-pilot’s collective are only active when the [a] is in the manual mode of operation.
VARTOMS (means: Variable Rotor Speed Torque Matching System)
- The [a] [b] turbine drives the compressor.
a. gas
b. generator
- The engine has an independent [a] [b] lubrication system installed on each engine.
a. Dry
b. Sump
- The VAR NR caution on the Caution and Advisory Display (CAD) and MAN pushbutton for the VARTOMS Mode Selector on the main switch panel illuminate in flight if the engines experience a torque split that exceeds [A]%.
15
- The “ENG OIL P” caution on the CAD below indicates that the [a] has lost its [b].
a. #1 engine
b. oil pressure
- If an engine is shutdown by the over-speed protection system the other engines over-speed protection system will be _______________.
disabled
- The symbol on the FLI below indicate the compressor bleed valve is ____________.
Open
- During the start sequence, you must turn on the [a] [b] switches in order to supply fuel to the engines.
a. Prime
b. Pump
- The [a] gear train drives the starter generator and the oil pump.
N1
- The major components of the accessory gearbox are the [a] gear train and the [b] gear train.
a. N1
b. N2
- Match the engine module to its correct purpose / description.
A + 4
B + 1
C + 2
D + 5
E + 6
F + 3
- The “TWIST GRIP” caution light will be illuminated on the CAD until the respective engine twist grip is placed in the “[a]” position.
Flight
- There are __________ fire detectors mounted in each engine compartment used to indicate an external engine fire.
3
- The thermocouples on each engine are used to measure what parameter displayed on the FLI?
Turbine Outlet Temperature
- In the combustion section, both [a] and [b] are mixed together and ignited to create power.
a. Air
b. Fuel
- Using the image below match the letter to its corresponding result on the engines.
(?VARTOM? Manual Button on collective)
Up D. Increases NR
Down A. Decreases NR
Left C.Increases power to engine 1 and decreases power to engine 2
Right B. Decreases power to engine 1 and increases power to engine 2
- In the event of an over-speed, the [a] and [b] valve activates to shut down the engine.
a. overspeed
b. Drain
- The [a] gear train drives the main transmission, which drives the main and tail rotor systems.
N2
- Expand the following abbreviation “VARTOMS”
VA
R
TO
M
S
a. Variable
b. Rotor
c. Torque
d. Matching
e. System
- What engine system has failed?
VAR NR Caution and MAN illuminated
VARTOMS
- Which engine module reduces the power turbine RPM, and transfers power forward to the power output flange?
reduction gearbox
- A fuel sample should be taken prior to the [a] [b] of the day
a. first
b flight
- When you see this display on the CAD the system is alerting you to the fact that your [a] tanks are [b].
F PUMP FWD and AFT on, Main tank: 18, Supply tanks: 100L and 114R
a. main
b. empty
- The purpose of the Fuel Vent System is to keep the fuel tanks [a] under all operating conditions.
unpressurized
- Before attempting an inflight restart, wait for the N1 to equal [a]%.
0
- What are the three additives that are blended into the military’s JP8 fuel?
- Corrosion Inhibitor/ Lubricity enhancer
- Fuel System Icing Inhibitor (FSII)
- Static dissipation additive
- The Fuel Prime Pumps are used during ___________.
engine start
- The prime pumps are located in the [a] tanks while the transfer pumps are located in the [b] tanks
a. suppy
b. main
- There are __________ fuel tanks in the UH-72 located beneath the cabin floor. (give quantity)
4
- The total fuel capacity of the fuel tank systems is [a] pounds. The main tanks hold [b] pounds, the right supply tank (larger) holds [c] pounds and the left supply tank holds [d] pounds. The total fuel quantity in the two supply tanks will always be [e] pounds until the fuel in the main tanks is exhausted.
a. 1530
b. 1308
c. 118
d. 104
e. 222
- The [a] supplies fuel via the jet pump into the [b] , which supplies fuel via the transfer pumps into the [c] for delivery to the engines.
a. aft main tank
b. forward main tank
c. supply tanks
- Name the four fuel tanks in the UH-72
[a] main tank
[b] main tank
[c] supply tank
[d] supply tank
a. forward
b. aft
c. left
d. right
- The FWD main tank is connected to the supply tanks by two overflows which are installed at different heights to achieve different volumes of the supply tanks to avoid simultaneous [a] of both [b].
a. flame out
b. engines
