Commonwealth legislation

AD/BAe 146/50 - Generator Control Unit

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Commonwealth

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legislative instrument

Plain English Summary

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Owners and operators of British Aerospace BAe 146 aircraft must arrange and pay for a one‑time inspection of generator control units (GCUs) and, if needed, adjust the under‑frequency trip setting per Avro International Aerospace Mandatory Inspection Service Bulletin S.B.24‑103. The measure, to be completed by 30 November 1994, responds to CAA findings that GCUs repaired by non‑GEC–Marconi workshops may have incorrect trip levels and aims to reduce related in‑service failures.

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AD/BAe 146/50 - Generator Control Unit

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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British Aerospace BAe 146 Series Aeroplanes

AD/BAe 146/50 Generator Control Unit 8/94

Applicability: All series BAe 146 aircraft.

Requirement: Action in accordance with Avro International Aerospace Mandatory Inspection Service Bulletin S.B.24-103 dated 24 March 1994.

Note: CAA(UK) AD 014-03-94 refers.

Compliance: Prior to 30 November 1994.

Background: The CAA(UK) have advised that investigation of in-service generator control unit (GCU) failures has highlighted the possibility that GCUs repaired or rectified by workshops other than GEC-Marconi, may have the under-frequency trip level set too high. This Directive requires the one time inspection of GCUs for possible incorrect under-frequency trip level settings and, if necessary, adjustment of the settings. The CAA(UK) compliance time is extended by two calendar months.

Source text

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

1 AD/BAe 146/50 - Generator Control Unit