Flight hydraulics Flashcards
What is the purpose of the flight control hydraulic systems?
The No. 1 and No.2 flight control hydraulic systems convert pilot mechanical inputs into hydraulic inputs
Each system can individually provide the fluid pressure to operate…
one of the pistons on each of the four dual upper boost actuators and half of each of the four integrated lower control actuators (ILCAs).
When can the hydraulic fill module be used to add fluid to the hydraulic systems?
can be used on the ground or in flight.
What is the purpose and location of the no.1 and no.2 flight hydraulic reservoir/coolers and fans?
hold and cool fluid, forward and aft pylon
What is the temperature range of the hydraulic fluid when the hydraulic cooling fans will operate?
54-63 degrees celsius
What is the purpose and location of the no.1 and no.2 flight hydraulic power transfer units?
provides hydraulic pressure to respective flight system while blades aren’t turning, forward and aft pylon
What is the purpose and location of the no.1 and no.2 flight hydraulic pumps?
provide hydraulic pressure once blades are turning, on the forward and aft transmissions
What is the purpose and location of the no.1 and no.2 flight hydraulic power control modules?
filters, monitors, and controls pressure fluid for respective systems. fore and aft pylon
The Lower Control Pressure Control Modules reduce pressure from ?????? to ?????, for the ?????? of the ILCA and the ??????? portion of the ILCA.
3,000 to 1,500 PSI, boost and extensible link portion
Which portion of the ILCAs is the no.1 side and which is the no.2 side?
no.1 is upper, and no. 2 is lower
What must be done if a JAM indicator is found extended on pre-flt?
notify maintenance
What is the purpose and location of the upper dual boost actuators?
Each actuator is mounted to the swashplate and will hydraulically move the swashplate based off of inputs received from the pilots and/or the AFCS
Are there any buttons on the upper dual boost actuators that must be checked during pre- flt?
Yes
How can you determine which portion of the reservoir/cooler is the cooler and which part is the reservoir?
the reservoir is the drum and the cooler is the sheave with a fan
What should be checked on pre-flt on the reservoir?
check fluid level and that green band is visible
What is the purpose of the bleed/relief valve on the reservoir?
protects the reservoir from over pressurization
What are the two sides of a PTU and what is the difference in each side?
motor and pump, motor is operated by the utility side and the pump by the flight side
What is the purpose of the PTUs?
provide hydraulic pressure to the flight controls when blades aren’t spinning
When will the flight hydraulic pumps provide hydraulic pressure to the system?
once the engines are started
What are the two drains on the flight hydraulic pumps and the purpose of each?
a seal drain for if the pump starts to leak, a case drain so the condition of the pump can be monitored
What are the buttons on the power control modules that should be checked during pre-flt?
the button indicates if there’s a clog in the filter and should be checked on pre-flight
How can the proper accumulator pressure on the power control module be checked on pre- flt?
you use the chart on the checklist
What is the purpose and proper use of the FLT CONTR switch?
only used on hydraulic and flight control check on runup
What does the HYD 1 FLT CONTR or HYD 2 FLT CONTR caution indicate?
the pressure drops below 1,800 PSI
What controls when the HYD 1 FLT CONTR or HYD 2 FLT CONTR caution will become active and inactive?
pressure switches on the power control module
If the HYD FLT CONTR caution is active, what other caution will also be active?
AFCS 1(2) FAIL caution
What flight hydraulic indications are on the maintenance panel?
pressure, temp, fluid level, filter, and pump fault
What is the temperature caution range for the flight hydraulic systems?
95-120
What is the temperature limit for the flight hydraulic systems?
120
Where (component name on the reservoir) does the maintenance panel receive the reservoir level indication from?
linear variable differential transducer on the reservoir/cooler
What does the pump fault light on the maintenance panel indicate?
The lights indicate an impending failure of the respective pump.
What does the WARNING in the operator’s manual about the PTU’s state?
The power transfer units are only designed for gentle maneuvers. Rapid control
inputs must be avoided. Rapid control inputs could extended the buttons on the
1(2) HYD FLT CONTR caution-
PWR XFER 1 and 2 switches- ON
Land as soon as possible
maintenance panel monitor
No.1 and/or No.2 flight hydraulic PUMP FAULT/FAIL light is on-
The HYD pump fault light alone indicates an IMPENDING FAILURE of the hydraulic pump, not an actual failure.
HYD PUMP FAULT Indicating Light. The HYD PUMP FAULT indicating light for the No. 1 and No. 2 flight control hydraulic pumps, utility hydraulic pump, and APU hydraulic pump can be identified on the MAINTENANCE PANEL. Should the indicator lamp illuminate, perform the following:
Land as soon as practicable, maintenance panel monitor
Can the HYD FLT CONTR caution be is active without the corresponding AFCS FAIL caution?
No
The Power control module belongs to what hydraulic system?
the flight control hydraulic system
What component decreases hydraulic pressure for the ILCA’s?
Lower control pressure control module
