MD 500 Rotorcraft Flight Manual: Powerplant Limitations Quiz
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MD 500 Rotorcraft Flight Manual: Powerplant Limitations Quiz

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Questions and Answers

What is the maximum allowable turbine outlet temperature for startup?

  • 737°C
  • 927°C
  • 793°C
  • 150°C (correct)
  • During power changes in flight, what is the permissible temperature range for the gas producer (N1) speed?

  • 61 - 65%
  • 793°C - 843°C (correct)
  • 104 - 106%
  • 64.5 psi torque
  • What is the maximum transient torque limit specified for the engine during takeoff?

  • 64.5 psi torque
  • 80.0 psi torque (correct)
  • 72.0 psi torque
  • 56.0 psi torque
  • What is the transient overspeed limit for the power turbine (N2) speed?

    <p>113% at idle power</p> Signup and view all the answers

    During takeoff, what is the maximum allowable turbine outlet temperature for a 5-minute period?

    <p>793°C</p> Signup and view all the answers

    What is the maximum ground idle speed for the gas producer (N1)?

    <p>61 - 65%</p> Signup and view all the answers

    What is the limitation on the use of MIL-G-5572E gasolines in the MD 500 Rotorcraft Flight Manual?

    <p>6 hours of operation per engine overhaul period</p> Signup and view all the answers

    When is the start pump required to be on when using alternate fuel mixtures or emergency fuels?

    <p>Until the engine is shutdown</p> Signup and view all the answers

    What action is required upon completion of a flight in progress in relation to the fuel filter?

    <p>It must be serviced following the illumination of the FUEL FILTER caution light</p> Signup and view all the answers

    What criterion must fuels meet when operating at 4°C (40°F) or less during cold weather operations?

    <p>Anti-icing capability of JP-4</p> Signup and view all the answers

    When is further flight prohibited until the fuel system is purged?

    <p>After engine flameout caused by fuel exhaustion</p> Signup and view all the answers

    What should be done during engine shutdown using the emergency fuel shutoff valve?

    <p>Drain fuel from engine compartment fuel drains if installed without start pump on</p> Signup and view all the answers

    What is the flight operation temperature limit range for the engine oil system?

    <p>0°C to 107°C</p> Signup and view all the answers

    At what N1 percent range should the flight operation pressure be between 90 - 130 psig?

    <p>78.5 to 94.2 percent N1</p> Signup and view all the answers

    What is the maximum continuous limit for the generator in terms of amperage?

    <p>66 amps</p> Signup and view all the answers

    In what situation is flight following a battery overtemperature of 160°F or above prohibited?

    <p>During takeoff</p> Signup and view all the answers

    If ignition is not attained, what is the prescribed procedure according to the text?

    <p>1 minute on, 1 minute off; 1 minute on, 23 minutes off;</p> Signup and view all the answers

    Which of the following fuels is NOT listed as a fuel specification in the text?

    <p>JP-7 (MIL-DTL-83133)</p> Signup and view all the answers

    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.

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