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Performance envelope extension method for a gas turbine engine

  • US 4,854,120 A
  • Filed: 12/14/1987
  • Issued: 08/08/1989
  • Est. Priority Date: 09/26/1986
  • Status: Expired due to Fees
First Claim
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1. A method of uniformly cooling a gas turbine engine having a spool, comprising the steps of:

  • determining when the engine is shutdown;

    turning on an auxiliary motor to rotate the spool after the engine is shutdown;

    determining if an external force in preventing the auxiliary motor form rotating the spool;

    turning off the auxiliary motor if such an external force is detected and allowing the external force to rotate the spool;

    determining when a predetermining time period after turbine shutdown has elapsed; and

    turning the auxiliary motor off after the time period has elapsed if the auxiliary motor is on at that time.

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