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CH-47 academics exam 4 > Fuel systems > Flashcards

Fuel systems Flashcards

1
Q

When will the indication for the fuel flow flash?

A

When one engines consumption is greater than 2995 lbs/hr

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2
Q

ERFS restraint ratings

A

The forward, vertical and lateral restraint ratings are 8 gs and the Aft rating is greater than 3 gs (measured with each tank half full)

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3
Q

What happens when all the fuel in an auxiliary tank is pumped to the main tank and consumed?

A

The fuel pump is automatically shut off and a check valve closes to prevent fuel from being pumped back into the auxiliary fuel tank.

TM 1-1520-271-10-1, page 2-39

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4
Q

If an auxiliary fuel pump fails during normal flight, will that fuel still be usable?

A

No

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5
Q

Fuel is delivered to the APU from the _________ main tank and to the heater from the ________main tank.

A

APU: left
Heater: right

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6
Q

What keeps fuel loss and post-crash fires to a minimum by breaking or shearing at predetermined locations and sealing themselves to retain fuel?

A

Breakaway fittings

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7
Q

What is the purpose of the jet pump located at the forward end of each main tank?

A

Evacuate the pressure refueling system (manifold.)

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8
Q

What is installed in each fuel tank to prevent fuel spillage from the vents should the helicopter roll over following a crash landing?

A

Rollover vent system.

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9
Q

Engine fuel valves and crossfeed valves can be operated ________________ or ________________.

A

Electrically or manually

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10
Q

How is an engine fuel valve closed or opened electrically?

A

Fire pull handle

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11
Q

How is an engine fuel valve closed or opened manually?

A

Lever on valve

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12
Q

Can fuel be transferred between tanks through the XFEED system?

A

No

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13
Q

What indicates to crew the operating condition of the XFEED and fuel valves?

A

Warning lights

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14
Q

Name one of three conditions that cause the engine or XFEED fuel valve warning lights to illuminate.

A

Fire pull handle or XFEED switch moved to a new position, a short circuit occurs, valve protection relay fails.

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15
Q

The engine fuel, XFEED, and refuel gate valve warning lights will illuminate under what three conditions?

A

Whenever valve position is moved electrically, a short circuit occurs, valve protection relay fails.

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16
Q

If the engines are running, CAAS will activate a FUEL LVL caution at ________ pounds indicated fuel as a backup in the event the fuel quantity low level warning system has failed.

17
Q

ENG1 FUEL PRESS LO and/or ENG2 FUEL PRESS LO caution(s) will become active when fuel pressure in the respective fuel line is below _______ PSI.

18
Q

An engine FUEL PRESS LO caution active does not represent a possible engine flameout as long as flight is conducted at or below __________ feet PA.

19
Q

During pressure refueling, the maximum fueling rate is _______ gallons per minute at 55 psi.

A

300 Gal/min.

20
Q

How is the jet pump system activated?

A

By turning on the forward main pump in either main tank.

21
Q

How is electrical power supplied to the refuel station?

A

Place the REFUEL STA switch on the cockpit FUEL CONT panel to ON.

22
Q

What two fuel system related switch positions are monitored by the Cockpit Voice and Flight Data Recorder (CVFDR)?

A

Main fuel boost pumps, crossfeed (XFEED.)

23
Q

If a REFUEL VALVE POSN indicating light remains illuminated when power is removed from the refuel station during rapid refuel operations, what will be the mission status of the fuel in the associated AFT AUX fuel tank?

A

The fuel in the tank will be unusable.

24
Q

What should be avoided if both boost pumps fail in either main fuel tank with the crossfeed open and a low fuel condition?

A

Nose low attitude in excess of 5 degrees.

25
Q

You are in flight at an altitude of 3,200 feet PA when a L FUEL LVL and ENG2 FUEL PRESS becomes active simultaneously. What two immediate actions must you perform?

A
  1. XFEED – CLOSE.

2. LAND AS SOON AS POSSIBLE.

26
Q

Number of fuel pumps

A

8, 1 in ea. AUX tank, 2 in ea. main tank

27
Q

number of fuel probes

A

10, 1 in ea. AUX tank, 3 in each main tank

28
Q

What component closes the fuel valves when the fuel level in the tank is near full

A

High level control valve

29
Q

What compoenent allows the engine driven fuel pumps to draw fuel from the main tanks?

A

The bellmouth fitting

30
Q

What component takes an analogue signal from the fuel flow transmitter and turns it into a digital signal?

A

The fuel flow conditioning unit

CH-47 academics exam 4 (5 decks)

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