Commonwealth legislation

AD/AC/56 Amdt 3 - Elevator Control System Bob Weight Installation - Inspection and Modification

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires operators of specified Twin Commander aeroplanes (serials 1–3323 unless already modified) to inspect the elevator bob‑weight side supports within 25 flight hours after 8 February 1982, repeat inspections every 60 hours until a permanent modification is fitted, and complete that modification within 500 hours. It consolidates earlier related ADs and service-bulletin requirements.

Operators and maintenance organisations pay for inspections and the modification; the Civil Aviation Safety Authority mandates compliance and record‑keeping. The rule replaces recurring inspection duplication by requiring one tracked modification deadline.

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Current sections

Direct links to the current provisions in AD/AC/56 Amdt 3 - Elevator Control System Bob Weight Installation - Inspection and Modification.

AD/AC/56 Amdt 3 - Elevator Control System Bob Weight Installation - Inspection and Modification

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes

AD/AC/56

Amdt 3

Elevator Control System Bob Weight Installation - Inspection and Modification

3/82

Applicability: Models 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E,

680F, 680F(P) and 720, S/Nos. 1 to 3323 except those aircraft which have complied with Rockwell International Service Bulletins No. 129 Rev. 4 and No. 136 Rev. 3 dated 26 January 1981 as applicable.

Document: Gulfstream American Service Information No. SI-176.

Note: Rockwell International SB 179 and FAA AD 75-12-09 Amendment 39-4246 refer.

Compliance: 1. Unless already accomplished, initially inspect within the next 25 hours’ time in service after 8 February 1982, and thereafter at intervals not exceeding 60 hours time in service until modified.

Modify within 500 hours’ time in service after 8 February, 1982.

Note: Aircraft certified to comply with AD/AC/56B and AD/AC/58B are deemed to comply with this Directive.

Background: Cracks have been found in the bob weight side supports of six overseas registered aeroplanes. Effectivity has been extended by aircraft serial number and the requirements of AD/AC/56B and AD/AC/58B have been consolidated into this AD.

Source text

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

1 AD/AC/56 Amdt 3 - Elevator Control System Bob Weight Installation - Inspection and Modification