Systems review Flashcards
What three characteristics make the fuel tank crash worthy?
Self-sealing breakaway valves, rollover vent valves, frangible fittings designed to fail
What pumps fuel over the baffles in the fuel tanks to the rear section of the cell?
Ejector pumps (operated by induced flow/venturi effect)
What does the 20 minute fuel light indicate?
A low fuel state
What do you do during a fuel boost pump failure?
If one boost pump fails it will indicate a drop in pressure, and a FUEL BOOST light will illuminate.
Land as soon as practical.
If the fuel pressure gauge indicates zero pressure and/or both FUEL BOOST caution lights illuminate, descend to 4,600’ Pressure Altitude and land as soon as possible
How many fuel capacitance probes are there?
What powers them?
3
VAC
What does VAC power on the TH-1H?
Fuel pressure indicator and Fuel Quantity indicator (EDCU)
What three components make up the Fuel Control Assembly?
Overspeed Gov (Nf), Computer section (Ng), Metering section (Ng)
What happens when the main fuel switch is in the ON position?
The fuel shutoff valve opens and the fuel boost pumps are energized. Fuel flows to the engine.
What does the start fuel switch do?
Energizes the start fuel solenoid, allowing fuel flow from the fuel regulator into the combustion chamber (fuel nozzles).
What does the start ignition trigger “start switch” control?
Controls the igniter solenoid valve and controls the starter generator.
What are the two fuel quantities?
- 5 Gal - Usable
208. 5 - Max total
What are the applicable shaft horsepowers of the T-53-L-703 engine?
Thermodynamic limit?
Power reduced by fuel control?
Take off power?
Max continuous power?
Thermodynamic limit: 1800 SHP
Power reduced by max fuel flow: 1500 SHP
TOP: 1290 SHP
MCP: 1134 SHP
What does the piggyback (bleed air reservoir) control?
Oil cooler fan, Engine De-ice, Cabin heat/defrost, improved particle separator
What controls/operates the bleed band actuator?
FCU
Bleed Air
What controls/operates the Variable Inlet Guide Vanes?
FCU
Fuel Pressure
Cabin heat uses ___% fuel flow at a rate of ___lbs/hr
2%
14lbs per hour
De-Ice uses ___% fuel flow at a rate of ___lbs/hr
3%
21lbs per hour
Ng rates:
10% 15% 40% 68% 68-72% 80% 91% 93-95% 105.8%
10% - Bat at least 16V 15% - Blades turning 40% - Let go of trigger start (or 35 sec) 68% - engine stabilized 68-72% - engine idle 80% - VIGV begin to open 91% - Start of Ng green band 93-95% - VIGV fully open 105.8% - Max Ng
How many chip detectors are in the aircraft?
In the powertrain?
6 in AC
5 in powertrain
Which chip detectors have ODDS?
90 gearbox, 42 gearbox, sump case, engine
Define land As Soon As Possible/Practical
Possible - Minimal damage to equipment/injury to personnel
Practical - No damage, no injury, accessible to MX
When does the HYD PRESS LO light come on?
When does it go back off?
1,000 +/- 100 PSI light on
1,200 +/- PSI light off
What reduces feedback during hydraulic failure or hydraulics off?
Irreversible valve
How many quadrants do hardovers take place in?
1 of 4
How many quadrants do hydraulic stiffness take place in?
2 of 4
When does the hydraulic system relief valve open/close?
Relief valve opens at 1,725 PSI
Closes at 1,530 PSI
Where is the hydraulic reservoir?
The right center edge of the roof
What are both the main DC generator and the standby starter generator rated for?
30 V / 300 AMP
What is the battery rated for?
24 V / 42 AMP
What is the standby generator adjusted to in relation to the main generator?
1 V less
When does the EXT PWR light come on?
When ext pwr door is open
What are the 4 sources of DC power for the aircraft?
Main gen, standby starter gen, battery, external power (ground power)
The voltage regulator keeps the main generator at ___ - ___ volts
27 - 28.5V
What relay automatically connects/disconnects generator to electrical systems?
reverse current relay
When does the overvoltage relay trip the field relay?
at 31 - 33 V
What do the synchronized elevators do?
Extend CG and increase controllability
What does the stabilizer bar on the main rotor head do?
Keeps the rotorblades in the same plane of rotation
T/F: Electrical power is required to turn the hydraulic system off.
TRUE
How many first aid kits are in the aicraft?
4
