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Questions and Answers
What is the maximum allowable turbine outlet temperature for startup?
During power changes in flight, what is the permissible temperature range for the gas producer (N1) speed?
What is the maximum transient torque limit specified for the engine during takeoff?
What is the transient overspeed limit for the power turbine (N2) speed?
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During takeoff, what is the maximum allowable turbine outlet temperature for a 5-minute period?
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What is the maximum ground idle speed for the gas producer (N1)?
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What is the limitation on the use of MIL-G-5572E gasolines in the MD 500 Rotorcraft Flight Manual?
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When is the start pump required to be on when using alternate fuel mixtures or emergency fuels?
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What action is required upon completion of a flight in progress in relation to the fuel filter?
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What criterion must fuels meet when operating at 4°C (40°F) or less during cold weather operations?
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When is further flight prohibited until the fuel system is purged?
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What should be done during engine shutdown using the emergency fuel shutoff valve?
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What is the flight operation temperature limit range for the engine oil system?
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At what N1 percent range should the flight operation pressure be between 90 - 130 psig?
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What is the maximum continuous limit for the generator in terms of amperage?
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In what situation is flight following a battery overtemperature of 160°F or above prohibited?
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If ignition is not attained, what is the prescribed procedure according to the text?
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Which of the following fuels is NOT listed as a fuel specification in the text?
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Study Notes
Powerplant Limitations
- Maximum takeoff power: 64.5 psi torque for 5 minutes
- Maximum continuous power: 56.0 psi torque
- Transient torque limits: 72.0 psi for 10 seconds, 80.0 psi for 3 seconds
- Turbine Outlet Temperature limits: 793°C for 5 minutes, 737°C continuously, 150°C for starting
- Transient temperature limits: 793°C to 927°C for 10 seconds during start and shutdown, 793°C to 843°C for 6 seconds during power changes in flight
Engine Speed Limits
- Gas Producer (N1) speed limits: 104% maximum continuous, 61-65% ground idle speed, 104-106% for 15 seconds
- Power Turbine (N2) speed limits: 103-104% normal operation, 113% for 15 seconds at idle power, 108% at 64.5 psi torque
Fuel Limitations
- Approved fuel types: Jet A, Jet A-1, JP-5, JP-8, AVGAS, and alternative mixtures
- Caution: MIL-G-5572E gasolines containing Tri-Cresyl-Phosphate (TCP) additives shall not be used
- Fuel filter: must be serviced after illumination of the FUEL FILTER caution light
- Fuel system purging: required after engine flameout, fuel drainage, or engine shutdown using emergency fuel shutoff valve
Engine Oil System Limits
- Temperature limits: 0°C to 107°C
- Pressure limits: 115-130 psig at 94.2% N1 and above, 90-130 psig at 78.5-94.2% N1, 50-130 psig at 78.5% N1 and below
Electrical System Limitations
- Generator limits: 66 amps maximum continuous, 10 minutes at 66-150 amps, 2 minutes at >150 amps
- Battery limits: flight prohibited after battery overtemperature of 160°F (71°C) or above until inspection
Starter Limitations
- If ignition is not attained: 1 minute on, 1 minute off; 1 minute on, 23 minutes off
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Description
Test your knowledge on the powerplant limitations for the Allison 250-C20 engine in the MD 500 rotorcraft, including torque limits for different scenarios and turbine outlet temperature restrictions.
