Fuel System

Question 1

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

Answer 1

5 fuel cells

3 across the aft fuselage
2 under cargo floor

Question 2

What is the fuel capacity in US gallons?

Answer 2

206. 5 gallons usable

208. 5 gallons total

Question 3

What characteristics make the fuel tank crashworthy?

Answer 3

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

Question 4

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

Answer 4

Lateral Baffle / Flapper

Question 5

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

Answer 5

Three

Question 6

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

Answer 6

Fuel Capacitance Probe

Question 7

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

Answer 7

EDCU

Question 8

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?

Answer 8

Low level Float switch / Low fuel state

Question 9

The Fuel Boost Pump is controlled by the ____.

Answer 9

Main Fuel Switch

Question 10

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

Answer 10

8 - 25 PSI

Question 11

The Boost Fuel Pump is ____ operated.

Answer 11

Electrically

Question 12

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

Answer 12

Ejector Pumps

Question 13

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

Answer 13

Main Fuel Shutoff Valve

Question 14

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

Answer 14

External filter has become clogged or impending bypass

Question 15

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

Answer 15

Nf speed

Question 16

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

Answer 16

Metering section

Computer Section

Overspeed Governor

Question 17

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

Answer 17

Ng speed

Question 18

The Fuel Control Assembly is mounted on the ___ gearbox

Answer 18

Ng Accessory gearbox

Question 19

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

Answer 19

Fuel Control Assembly

Question 20

What are the two positions on the Overspeed Governor?

Answer 20

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

Question 21

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

Answer 21

11 - 15%

Question 22

How many elements are in the engine driven fuel pump?

Answer 22

two elements

Question 23

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

Answer 23

Engine-driven fuel pump

Question 24

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

Answer 24

either/both

Question 25

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

Answer 25

Changeover Solenoid Valve

Question 26

What controls engine RPM and has a twist grip type?

Answer 26

Throttle

Question 27

What prevents inadvertent closing of the throttle?

Answer 27

Idle Stop

Question 28

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

Answer 28

Starter Ignition Trigger Switch

Question 29

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

Answer 29

start fuel switch

Question 30

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

Answer 30

500 degrees C

Question 31

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

Answer 31

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

Question 32

The linear actuator is remotely controlled by a switch on the ____. what are the limits?

Answer 32

Collective head Increases/Decreases Nf RPM (6000 - 6700)

Question 33

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

Answer 33

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

Question 34

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

Answer 34

Overspeed Governor

Question 35

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

Answer 35

Shear Pin

Question 36

The manifold delivers fuel to ___ atomizers

Answer 36

22

Question 37

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

Answer 37

Combustion Chamber

Question 38

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

Answer 38

Flow Divider/ Dump Valve