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CEARF > Fuel System > Flashcards

Fuel System Flashcards

1
Q

How many interconnected fuel cells are on the TH-1H?

A

5 fuel cells

3 across the aft fuselage
2 under cargo floor

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2
Q

What is the fuel capacity in US gallons?

A
  1. 5 gallons usable

208. 5 gallons total

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3
Q

What characteristics make the fuel tank crashworthy?

A

Self sealing breakaway valves, rollover vent valves, frangible fittings designed to fail

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4
Q

Each forward fuel cell is divided into two compartments by a ____ with a ____ valve to allow fuel flow from front to back.

A

Lateral Baffle / Flapper

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5
Q

How many fuel transmitters measure capacitance and relay information through the EDCU to the MFD.

A

Three

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6
Q

This component allow for better sampling of fuel quantity. Changes in the level cause a change in the probe capacitance.

A

Fuel Capacitance Probe

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7
Q

The ____ provides the 26 VAC excitation power for the fuel quantity. It also processes the incoming capacitance readings and feeds digital data to the MFD

A

EDCU

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8
Q

The ____ controls the 20 minute fuel light. The caution light illuminates when fuel is low (between 130 - 240 lbs)

What state does this cause when the light goes off?

A

Low level Float switch / Low fuel state

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9
Q

The Fuel Boost Pump is controlled by the ____.

A

Main Fuel Switch

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10
Q

The Fuel Boost Pump is rated to ___ - ___ PSI.

A

8 - 25 PSI

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11
Q

The Boost Fuel Pump is ____ operated.

A

Electrically

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12
Q

The ____ pumps fuels over the baffles into the rear section of the fuel cell and is operated by the venturi effect

A

Ejector Pumps

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13
Q

The ____ is a positive fuel shutoff that is an electrical motor-operated gate-type valve controlled by the main fuel switch

The manual override handle is behind the aft access panel

A

Main Fuel Shutoff Valve

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14
Q

The Fuel Filter caution light (FUEL FILTER) comes on during what two conditions?

A

External filter has become clogged or impending bypass

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15
Q

The Overspeed Governor is driven at a speed proportional to ___?

A

Nf speed

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16
Q

The Fuel Control Assembly is made up of what three sub-sections?

A

Metering section

Computer Section

Overspeed Governor

17
Q

The metering and computer sections are driven at a speed proportional to ___?

A

Ng speed

18
Q

The Fuel Control Assembly is mounted on the ___ gearbox

A

Ng Accessory gearbox

19
Q

What component delivers high-pressure, metered fuel to the combustion section?

A

Fuel Control Assembly

20
Q

What are the two positions on the Overspeed Governor?

A

AUTO - permits the overspeed governor to automatically control the engine RPM with the throttle in the full open position

EMER - Allows manual control of engine RPM

21
Q

When the GOV switch is placed in the EMER position, power available will be reduced by __ - __%.

A

11 - 15%

22
Q

How many elements are in the engine driven fuel pump?

A

two elements

23
Q

The ____ increases fuel pressure to fuel control metering valve on the engine.

A

Engine-driven fuel pump

24
Q

The engine-driven fuel pump caution light comes on if ____ element(s) fail.

A

either/both

25
Q

The ____ is electrically controlled by the governor switch and permits changeover from automatic to emergency operations.

A

Changeover Solenoid Valve

26
Q

What controls engine RPM and has a twist grip type?

A

Throttle

27
Q

What prevents inadvertent closing of the throttle?

A

Idle Stop

28
Q

The ____ controls the igniter solenoid (engine starting solenoid valve) and the starter generator.

A

Starter Ignition Trigger Switch

29
Q

In conjunction with the start switch, the ____ energizes the starting fuel solenoid valve

A

start fuel switch

30
Q

The start fuel switch must be turned OFF at approx ___ degrees C during engine start

A

500 degrees C

31
Q

When the Main Fuel Switch is in the ON position is does what three things?

A

Opens the shutoff valve, energized the electric boost pumps, energizes igniters.

32
Q

The linear actuator is remotely controlled by a switch on the ____.

what are the limits?

A

Collective head

Increases/Decreases Nf RPM (6000 - 6700)

33
Q

What component transmits movement to the linear actuator and overspeed governor? It stabilizes Nf RPM as engine load fluctuates with pitch change (+/- 1%)

A

Droop Cam Compensator

Design droop as much as 4 - 6% Nf (Flat pitch to full power)

34
Q

This component maintains constant Nf RPM and is mounted above the fuel control on the Nf gearbox. Driven by Nf

A

Overspeed Governor

35
Q

This pin prevents collective from jamming in case of engine control binding

A

Shear Pin

36
Q

The manifold delivers fuel to ___ atomizers

A

22

37
Q

Atomizers are located at the ____ of the combustion chamber and spray fuel into the ____.

A

Combustion Chamber

38
Q

The ____ valve automatically drains any unburned fuel from the combustion chamber

A

Flow Divider/ Dump Valve

CEARF (15 decks)

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