Flight Controls and Hydraulics Flashcards
Where is the pedal adjust handle located?
On the outside of the instrument panel.
Which cockpit control has a telescoping (extend/retract) feature?
Co-pilot’s collective
Outputs from cockpit controls are carried by mechanical linkage through the pilot assist servos to the ____________________.
Mechanical Mixing Unit (MMU)
The MMU is designed to reduce __________________________.
Inherent Control Coupling.
Name the four mechanical mixes provided by the MMU.
Collective to Pitch, Collective to Roll, Collective to Yaw, and Yaw to Pitch.
How does the MMU minimize inherent control coupling?
By combining, summing, and coupling collective, pitch, and yaw inputs.
Why is Collective/Airspeed to Yaw mixing completely phased out when the airspeed is above 100 kts?
Due to the efficiency of the tail rotor and cambered fin.
What has happened if we get the TAIL ROTOR QUAD FAIL caution?
One or both of the tail rotor cables has failed.
If only one of the cables breaks, what kind of aircraft control do the pilots have?
Full aircraft control.
If both cables break how do the pilots control the yaw axis?
Airspeed dependent on the aircraft gross weight.
Moving the SERVO OFF switch from NORM to 1ST STG or 2ND STG will _________________________________.
Turn off that stage (1st or 2nd) of the three primary servos.
What prevents the two stages of the primary servos from being turned off simultaneously?
Electrical interlock
On which panel can you find both the TAIL SERVO and BACKUP HYD PUMP switches?
MISC SWITCH panel
What system will automatically shut off components if a leak is detected?
LDI
The fluid quantity switch on the hydraulic pump module activates the appropriate RSVR LOW caution which indicates ________________.
A loss of hydraulic fluid for that system (Leak) less than 60% of fluid remaining in the pump.
What are the #1 and #2 hydraulic pumps mounted to and driven by?
The Accessory Modules.
What is the Backup Pump driven by?
An electric motor
What five things will activate the backup pump
HYD PUMP 1 FAIL
RSVR 1 LOW
T/R SERVO 1 FAIL
HYD PUMP 2 FAIL
APU ACCUM LOW
What is the purpose of the APU Accumulator?
Provide a hydraulic charge to the APU start motor.
In flight, the backup pump mode automatically sets to?
The AUTO mode even if the switch is in the Off or ON position.
What does the backup pump supply pressure to?
No. 1 and/or No. 2 hydraulic systems, 2nd stage tail rotor servo and APU accumulator.
What component located in the utility module will isolate a leak that occurs in the APU Accumulator?
The Velocity Fuse
The No. 2 hydraulic system supplies pressure through the transfer module to what servos?
The second stage primary servos and the pilot-assist servos.
The failure of the No. 2 hydraulic system illuminates what cautions / advisories if the backup pump fails to come on?
HYD PUMP 2 FAIL, PRI SERVO 2 FAIL, BOOST SERVO OFF, SAS OFF, TRIM FAIL and FPS FAIL.
Appearance of the BOOST SERVO OFF caution indicates what?
Loss of hydraulic pressure to the collective and/or yaw boost servo.
What component inside the transfer modules stops the leak if it is in the HYD Pump?
The Transfer Valve
If the T/R SERVO 1 FAIL caution appears, what should automatically happen?
The backup pump should come on and pressurize the 2nd stage tail rotor servo.
The No. 1 hydraulic system supplies hydraulic fluid through it’s transfer module to what servos?
The 1st stage primary servos and 1st stage tail rotor servo.
The RSVR 1 LOW caution illuminates when?
When there is 60% fluid remaining in the reservoir (leak in the system).
What are the three types of hydraulic malfunctions that we can have?
A leak, a hydraulic pump failure, component jams.
