Fuel System Flashcards
How many interconnected fuel cells are on the TH-1H?
5 fuel cells
3 across the aft fuselage
2 under cargo floor
What is the fuel capacity in US gallons?
- 5 gallons usable
208. 5 gallons total
What characteristics make the fuel tank crashworthy?
Self sealing breakaway valves, rollover vent valves, frangible fittings designed to fail
Each forward fuel cell is divided into two compartments by a ____ with a ____ valve to allow fuel flow from front to back.
Lateral Baffle / Flapper
How many fuel transmitters measure capacitance and relay information through the EDCU to the MFD.
Three
This component allow for better sampling of fuel quantity. Changes in the level cause a change in the probe capacitance.
Fuel Capacitance Probe
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
EDCU
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?
Low level Float switch / Low fuel state
The Fuel Boost Pump is controlled by the ____.
Main Fuel Switch
The Fuel Boost Pump is rated to ___ - ___ PSI.
8 - 25 PSI
The Boost Fuel Pump is ____ operated.
Electrically
The ____ pumps fuels over the baffles into the rear section of the fuel cell and is operated by the venturi effect
Ejector Pumps
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
Main Fuel Shutoff Valve
The Fuel Filter caution light (FUEL FILTER) comes on during what two conditions?
External filter has become clogged or impending bypass
The Overspeed Governor is driven at a speed proportional to ___?
Nf speed
The Fuel Control Assembly is made up of what three sub-sections?
Metering section
Computer Section
Overspeed Governor
The metering and computer sections are driven at a speed proportional to ___?
Ng speed
The Fuel Control Assembly is mounted on the ___ gearbox
Ng Accessory gearbox
What component delivers high-pressure, metered fuel to the combustion section?
Fuel Control Assembly
What are the two positions on the Overspeed Governor?
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
When the GOV switch is placed in the EMER position, power available will be reduced by __ - __%.
11 - 15%
How many elements are in the engine driven fuel pump?
two elements
The ____ increases fuel pressure to fuel control metering valve on the engine.
Engine-driven fuel pump
The engine-driven fuel pump caution light comes on if ____ element(s) fail.
either/both
The ____ is electrically controlled by the governor switch and permits changeover from automatic to emergency operations.
Changeover Solenoid Valve
What controls engine RPM and has a twist grip type?
Throttle
What prevents inadvertent closing of the throttle?
Idle Stop
The ____ controls the igniter solenoid (engine starting solenoid valve) and the starter generator.
Starter Ignition Trigger Switch
In conjunction with the start switch, the ____ energizes the starting fuel solenoid valve
start fuel switch
The start fuel switch must be turned OFF at approx ___ degrees C during engine start
500 degrees C
When the Main Fuel Switch is in the ON position is does what three things?
Opens the shutoff valve, energized the electric boost pumps, energizes igniters.
The linear actuator is remotely controlled by a switch on the ____.
what are the limits?
Collective head
Increases/Decreases Nf RPM (6000 - 6700)
What component transmits movement to the linear actuator and overspeed governor? It stabilizes Nf RPM as engine load fluctuates with pitch change (+/- 1%)
Droop Cam Compensator
Design droop as much as 4 - 6% Nf (Flat pitch to full power)
This component maintains constant Nf RPM and is mounted above the fuel control on the Nf gearbox. Driven by Nf
Overspeed Governor
This pin prevents collective from jamming in case of engine control binding
Shear Pin
The manifold delivers fuel to ___ atomizers
22
Atomizers are located at the ____ of the combustion chamber and spray fuel into the ____.
Combustion Chamber
The ____ valve automatically drains any unburned fuel from the combustion chamber
Flow Divider/ Dump Valve
