1H-60(H)G-1 Section 1 Flashcards
When does the impending bypass pop on the fuel filter?
When differential pressure reaches 6 psi
When does the #1 or #2 FUEL PRESS caution light illuminate?
When fuel pressure drops below 9 psi
The HMU pressurizes fuel to ___? The HMU provides __ protection at ___.
832 psi
Ng protection @ 110 +/- 2%
What are the functions of the ODV?
- Provides hot start protection ( TGT > 900°, Nf < 50%, Ng < 60%)
- Provides Nf overspeed protection @ 120 +/- 1%
- Purges fuel nozzles on engine shutdown
What does the engine alternator power?
The DEC, ignition exciter, and provides an Ng signal to the VIDS
What is the 10 minute TGT limiting range?
857-875°C
What is the 2.5 minute TGT limiting range?
881-901°C
When do you have access to 2.5 minute TGT limiting?
- Moving throttle(s) to DEC LOCKOUT
- An engine drops below 50% Ng
- Turning the contingency power switch on
How can the pilot bypass HSP?
By pressing and holding the respective overspeed test button on startup for said engine.
What do the exhaust frame sensors provide?
The left sensor provides Nf signal to the DEC. The right sensor provides information for the torque computation circuit and for the Nf overspeed system.
How many thermocouples are their on an engine?
7
When will a #1 or #2 ENGINE OIL PRESS caution light illuminate?
When pressure drops below 22 psi.
What is the engine oil tank capacity?
7.6 U.S. quarts
When does the #1 or #2 OIL FLTR BYPASS caution light illuminate?
When pressure reaches 60-80 psi
What are the parameters for a cross-bleed start?
The source engine must be at least 90% Ng, 100% Nr, engine anti-ice off, APU off, and AIR/SOURCE HEAT START SWITCH to ENG
When does power turbine speed become governed?
When the throttles are moved to IDLE
What 4 things happen when a t-handle is pulled?
Fuel is shut off, a stop sequence is sent to the ESU, the fire extinguisher system is armed, and the directional control valve is set
The APU fuel pump pressurizes to what psi?
5
Fuel consumption of the APU is rated at _____ and supplied from the _____.
150 lbs. per hour
Left main tank
The APU accumulator must be at least ____ before attempting an APU start.
2,800 psi
How long does it take for the accumulators to recharge?
180 seconds
How much of the main rotor blade has an electro-thermal blanket covering it?
60% of the blades leading edge
How much negative twist is built into the blades?
18°
How far back are the main rotor blades swept back and what purpose does that serve?
20°. Decreases noise, tip vortices, and increases airspeed
How much are the tail rotor blades canted upward? How much lift do they generate?
20° and 2.5% of total lift in a hover
What malfunction illuminates the TAIL ROTOR QUADRANT causation light? What happens to the tail rotor when this happens?
A broken tail rotor cable. The tail rotor assumes full pitch in the direction of the broken cable via pressure from a spring on the rotor head.
The main transmission has a built-in ____ forward tilt.
3°
When does the MAIN XMSN OIL PRESS caution light illuminate?
When pressure drops below 14 +/- 2psi
When does the MAIN XMSN OIL TEMP caution light illuminate?
140°C
Should a chip be detected in the main transmission module, a delaying circuit will allow ____ for it to wash away or burn off before the caution light illuminates.
30 seconds
CHP INPUT MDL-LH, CHP INPUT MDL-RH, CHIP ACCESS MDL-LH, CHP ACCESS MDL-RH, CHP INT XMSN, and CHP TAIL XMSN will illuminate immediately and stayed illuminated for ______ indicated a good circuit. The CHP MAIN MDL SUMP illuminates after a _____ delay and remains illuminated for an additional ____ then extinguish, indicating a good circuit.
45-70 seconds, 30 seconds
When do the INT XMSN OIL TEMP & TAIL XMSN OIL TEMP caution lights illuminate?
When oil temperature reaches 140°C
What are the characteristics of the fuel tanks?
They’re interchangeable, crash worthy, ballistic resistant, and have self-sealing valves.
All engine fuel lines are _______. APU fuel lines are not.
Self-sealing
When does the fuel filter impending bypass pop?
6 psid
When does the PRIME BOOST PUMP advisory light illuminate?
5 psi
Note
With the NO. 1 and NO. 2 starter circuit breakers pulled, the engine will flameout when the Overspeed test is performed.
Note
If Ng increases above 110% +/- 2% due to Nf overspeed protection failure, the HMU will cutoff fuel flow and the engine will flameout with no automatic relight or capability of restart.
What is the capacity of the main fuel tanks?
185 gal. total w/ 170 gal. usable
When do the #1 & #2 FUEL LOW caution lights illuminate?
When remaining fuel in either tank is approximately 172lbs.
When does the NO FUEL XFER caution light illuminate?
When either main tank is below 550 +/- 55 lbs.
When does the OVERFLOW advisory light illuminate?
When the thermistor in the vent line detects an overflow
Caution
Dry running the transfer pumps in the manual mode may cause transfer pump failure.
How fast does fuel get dumped?
800 ppm
When will fuel dumping automatically stop?
When the main tanks refuel down to 172 lbs. in each tank.
What are the main generators rated for?
115/200 VAC
What is the battery rated for?
24 VDC
