Cool Engine Stuff | N2 Knowledge | Emergency Procedures | More Emergency Procedures | I want some more EPs! |
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approximately 2/3
How much total power that the engine produces does the N1 Turbine extract
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Reduction Gearbox on front of the engine, the transmission and the overspeed governor and tachometer drive gearbox on the left side of the engine
The N2 turns the following three systems
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1. COLLECTIVE ADJUST as required to maintain rotor
2. PEDALS ADJUST as required 3. THROTTLE ADJUST as required 4. AIRSPEED ADJUST as required
AUTOROTATE
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transmit May Day call, set the transponder to emergency, jettison external stores and lock the shoulder harness
During an emergency autorotational landing, if time permits the crew should
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1. Collective - Reduce
2. DE-ICE and BLEED AIR switches - off 3. Land as soon as possible
Engine Compressor Stall
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approximately 1/3
How much of the total power from the engine does the N2 Turbine extract
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21090 RPM to 6600 RPM
The reduction gearbox reduces the N2 RPM from what to what
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1. THROTTLE - OFF
2. FUEL switches - OFF 3. BATT switch - OFF
EMERGENCY SHUTDOWN
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Autorotate
Engine malfunction in a hover
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Accomplish an approach and landing to the ground with torque not to exceed the maximum available. If possible, a running landing is recommended
Inlet Guide Vane Actuator Failure - Closed
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Anti-Ice system, Start Fuel System, Oil Cooler Fan, Heater, Bleed Band
Which systems use Bleed Air
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N2 tachometer generator, the power turbine governor and the torquemeter boost pump
The overspeed governor and tachometer drive gearbox drives these N2 accessories
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1. GOV - switch - EMER
2. Throttle - adjust as necessary to control RPM 3. Land as soon as POSSIBLE
EMER GOV OPNS
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1. AUTOROTATE
2. EMER GOV OPNS
Engine malfunction at low altitude/low airspeed or in cruise flight
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due to increasingly lower N1 settings accelration times will correspondingly increase
Inlet Guide Vane Actuator Failure - Open: What happens to the power application of the helicopter
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The Bleed Band
What regulates the air passing through the N1 section to ensure proper operation during various engine RPM settings and helps with avoiding a compressor stall
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Senses the actual N2 RPM, senses the reference RPM selected by the GOV RPM INC/DECR switch and sends the signal to the fuel control thru a rod to maintain reference RPM
What does the Power Turbine Governor do
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Land as soon as POSSIBLE
ENGINE OIL TEMPERATURE HIGH
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1. Throttle - off
2. Starter Gen Switch - START 3. FUEL switches - ON 4. GOV switch - EMER 5. Attempt Start 6. Land as soon as possible
Engine Restart During Flight
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1. Collective - Increase to load the rotor in an attempt to maintain rpm bellow the max operating limit
2. Throttle - reduce until normal operating rpm is attained. Continue with manual throttle control 3. EMER GOV OPNS if reduction of throttle does not reduce rpm as required
Engine Overspeed
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N1 Tachometer Generator, Fuel Control, Engine Driven Fuel Pump, Oil Pump Assembly, Starter Generator
What accessories are driven by the Accessory Gearbox
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Throttle Quadrant position, N2 demand from the Power Turbine Governor Rod, N1 RPM from the geartrain, Outside Air Temperature from the OAT sensor and Pressure Altitude from the Pressure Altitude Bellows
The Automatic Fuel Control Unit schedules fuel flow to the combustor based on data from these 5 systems
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GOV switch may be moved to the EMER position and throttle adjusted in an attempt to correct the surging condition. If flight is not possible close the throttle completely and complete an autorotational landing.
Partial Power Condition with engine surges
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EMER GOV OPNS
Droop Compensator Failure
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1. Land as soon as POSSIBLE
2. EMER SHUTDOWN - After Landing
Transmission oil hot or low pressure
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