Commonwealth legislation

AD/B737/50 - APU - EGT Overtemperature Condition

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires operators of Boeing 737-300 and 737-400 aeroplanes to inspect and modify their auxiliary power unit (APU) installation as specified in FAA AD 90-23-12 (which refers to Boeing Service Bulletin 737-49-1071). It addresses a fault where the APU exhaust gas temperature indication can read “zero” after shutdown, risking undetected overtemperature damage and possible rotor failure; operators must follow the FAA/Boeing instructions to detect and correct the condition.

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AD/B737/50 - APU - EGT Overtemperature Condition

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Boeing 737 Series Aeroplanes

AD/B737/50 APU - EGT Overtemperature Condition 2/91

Applicability: Boeing 737-300 and 737-400 series.

Requirement: Inspect and modify subject airplanes in accordance with FAA AD 90-23-12.

Note: FAA AD 90-23-12 refers to Boeing Service Bulletin 737-49-1071, dated May 10, 1990.

Compliance: As per Requirement Document.

Background: FAA AD action prompted by reports that the APU exhaust gas temperature (EGT) indication incorrectly read “zero” following an APU shut down. This condition, if not corrected, could result in undetected overtemperature damage to the APU rotor structure, which could then result in rotor failure and possible structural damage to the aeroplane.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.