Ch. 2 - Hydraulic Flashcards
All components of the hydraulics system receive __________ with the exception of _________ which receives ___________.
3000 psi
Pitch and roll trim actuators
1000 psi
The backup Hyd pump is________ driven.
Electric motor
If there is a BACKUP PUMP PWR circuit breaker out and a condition exsists that requires the pump to operate then ________
The system must be configured so that the backup pump will not come on when you reset the CB or
AC power must be secured prior to resetting the the CB.
Backup pump initiation with AFCS heading hold engaged may cause?
Heading hold failure. Can be reset by pressing the cubes.
FLIR may fail if ___________
Backup hyd pump is turned on with FLIR operating.
The Backup HYD pump will turn on in _______ if on ________ or ____ if on ________.
4 seconds, APU or EXT power
.5 seconds, if either main generator is running.
With WOW and Backup HYD Pump in OFF, ON, and AUTO?
OFF- pump is off.
ON- pump recirculates fluid to and from each transfer module and maintains pressure in the APU accumulator and rescue hoist systems, as required.
AUTO- pump automatically maintains Hyd pressure to the No. 1 and/or No. 2 Hyd systems, including the second stage of the tail rotor servo (as required for hyd system pressure and/or fluid losses detected by the LDI)
Without the WOW and the back up pump in OFF/AUTO, and ON?
OFF/AUTO- pump automatically maintains Hyd pressure to the No. 1 and/or No. 2 Hyd systems, including the second stage of the tail rotor servo (as required for hyd system pressure and/or fluid losses detected by the LDI)
ON- pump recirculates fluid to and from each transfer module and maintains pressure in the APU accumulator and rescue hoist systems, as required.
When APU accum px is low and Backup is activated the pump will run for_____
90 seconds (180 seconds w/winterization kit), regardless of switch position.
Conditions that cause automatic backup pump module operation to be initiated:
- # 1 HYD PUMP
- # 2 HYD PUMP
- # 1 RSVR LOW
- # 1 TAIL RTR SERVO
Utility module routes backup Hyd fluid to the _________
No. 1 and 2 transfer modules
2nd stage of the tail rotor servo
Rescue hoist
APU accum
The priority valve will do what?
Will restrict hydraulic fluid to the rescue hoist in the event that back up hydraulic pressure decreases below a prescribed value.
It’s located between the utility module and the rescue hoist
The velocity fuse will?
Secure hydraulic fluid to APU accumulator if the flow rate exceeds a prescribed limit.
It’s located between the utility module and the APU
How do you reset the LDI logic?
Cycling the HYD LEAK TEST switch
What 5 thing do you need for the HYD LEAK TEST?
RAAWR
- Rotors engaged
- AC power
- AUTO position for BACKUP PUMP switch
- WOW
- Reservoirs full