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Ch-47 academics exam 2 > Flight hydraulics > Flashcards

Flight hydraulics Flashcards

1
Q

What is the purpose of the flight control hydraulic systems?

A

The No. 1 and No.2 flight control hydraulic systems convert pilot mechanical inputs into hydraulic inputs

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2
Q

Each system can individually provide the fluid pressure to operate…

A

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).

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3
Q

When can the hydraulic fill module be used to add fluid to the hydraulic systems?

A

can be used on the ground or in flight.

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4
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic reservoir/coolers and fans?

A

hold and cool fluid, forward and aft pylon

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5
Q

What is the temperature range of the hydraulic fluid when the hydraulic cooling fans will operate?

A

54-63 degrees celsius

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6
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic power transfer units?

A

provides hydraulic pressure to respective flight system while blades aren’t turning, forward and aft pylon

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7
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic pumps?

A

provide hydraulic pressure once blades are turning, on the forward and aft transmissions

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8
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic power control modules?

A

filters, monitors, and controls pressure fluid for respective systems. fore and aft pylon

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9
Q

The Lower Control Pressure Control Modules reduce pressure from ?????? to ?????, for the ?????? of the ILCA and the ??????? portion of the ILCA.

A

3,000 to 1,500 PSI, boost and extensible link portion

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10
Q

Which portion of the ILCAs is the no.1 side and which is the no.2 side?

A

no.1 is upper, and no. 2 is lower

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11
Q

What must be done if a JAM indicator is found extended on pre-flt?

A

notify maintenance

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12
Q

What is the purpose and location of the upper dual boost actuators?

A

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

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13
Q

Are there any buttons on the upper dual boost actuators that must be checked during pre- flt?

A

Yes

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14
Q

How can you determine which portion of the reservoir/cooler is the cooler and which part is the reservoir?

A

the reservoir is the drum and the cooler is the sheave with a fan

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15
Q

What should be checked on pre-flt on the reservoir?

A

check fluid level and that green band is visible

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16
Q

What is the purpose of the bleed/relief valve on the reservoir?

A

protects the reservoir from over pressurization

17
Q

What are the two sides of a PTU and what is the difference in each side?

A

motor and pump, motor is operated by the utility side and the pump by the flight side

18
Q

What is the purpose of the PTUs?

A

provide hydraulic pressure to the flight controls when blades aren’t spinning

19
Q

When will the flight hydraulic pumps provide hydraulic pressure to the system?

A

once the engines are started

20
Q

What are the two drains on the flight hydraulic pumps and the purpose of each?

A

a seal drain for if the pump starts to leak, a case drain so the condition of the pump can be monitored

21
Q

What are the buttons on the power control modules that should be checked during pre-flt?

A

the button indicates if there’s a clog in the filter and should be checked on pre-flight

22
Q

How can the proper accumulator pressure on the power control module be checked on pre- flt?

A

you use the chart on the checklist

23
Q

What is the purpose and proper use of the FLT CONTR switch?

A

only used on hydraulic and flight control check on runup

24
Q

What does the HYD 1 FLT CONTR or HYD 2 FLT CONTR caution indicate?

A

the pressure drops below 1,800 PSI

25
Q

What controls when the HYD 1 FLT CONTR or HYD 2 FLT CONTR caution will become active and inactive?

A

pressure switches on the power control module

26
Q

If the HYD FLT CONTR caution is active, what other caution will also be active?

A

AFCS 1(2) FAIL caution

27
Q

What flight hydraulic indications are on the maintenance panel?

A

pressure, temp, fluid level, filter, and pump fault

28
Q

What is the temperature caution range for the flight hydraulic systems?

A

95-120

29
Q

What is the temperature limit for the flight hydraulic systems?

A

120

30
Q

Where (component name on the reservoir) does the maintenance panel receive the reservoir level indication from?

A

linear variable differential transducer on the reservoir/cooler

31
Q

What does the pump fault light on the maintenance panel indicate?

A

The lights indicate an impending failure of the respective pump.

32
Q

What does the WARNING in the operator’s manual about the PTU’s state?

A

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

33
Q

1(2) HYD FLT CONTR caution-

A

PWR XFER 1 and 2 switches- ON
Land as soon as possible
maintenance panel monitor

34
Q

No.1 and/or No.2 flight hydraulic PUMP FAULT/FAIL light is on-

A

The HYD pump fault light alone indicates an IMPENDING FAILURE of the hydraulic pump, not an actual failure.

35
Q

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:

A

Land as soon as practicable, maintenance panel monitor

36
Q

Can the HYD FLT CONTR caution be is active without the corresponding AFCS FAIL caution?

A

No

37
Q

The Power control module belongs to what hydraulic system?

A

the flight control hydraulic system

38
Q

What component decreases hydraulic pressure for the ILCA’s?

A

Lower control pressure control module

Ch-47 academics exam 2 (6 decks)

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