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Aircraft engine cycle logging unit

  • US 5,552,987 A
  • Filed: 07/20/1994
  • Issued: 09/03/1996
  • Est. Priority Date: 07/20/1994
  • Status: Expired due to Fees
First Claim
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1. In an aircraft monitoring system comprising a microprocessor operatively connected to a non-volatile memory containing as a record therein a current flight cycle count, to a buffer memory, to an altitude transducer, to an acoustic transducer, to an airframe power supply voltage input, and to a timekeeping means, a method of determining an occurrence of a flight cycle, said method comprising the steps of:

  • a) determining a first time at which said voltage input exceeds a predetermined voltage value, and storing at said first time in said buffer memory a first value representative of an output of said altitude transducer,b) determining a second time, after said first time, at which said acoustic output exceeds a predetermined acoustic value,c) determining a third time, after said second time, at which said output from said altitude transducer differs from said first output by a predetermined altitude value and storing said third time in said buffer memory,d) determining a fourth time, after said third time, at which said output from said acoustic transducer falls below said predetermined acoustic value, ande) incrementing said flight cycle count responsive to said determination of said fourth time.

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