Commonwealth legislation

AD/BEECH 77/6 - Engine Mount Assembly to Firewall Attach Bolts

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires owners/operators of specified Beechcraft 77 (Skipper) serial numbers to inspect/repair engine‑mount attachment bolts and barrel nuts—following Beechcraft Service Instruction No. 1153—because threads may have been damaged at factory installation.

The mandated work must be completed within 25 hours’ time in service after 30 October 1980, is at the owner’s expense, and will require qualified maintenance, parts, and short downtime.

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AD/BEECH 77/6 - Engine Mount Assembly to Firewall Attach Bolts

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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 Beechcraft 77 (Skipper) Series Aeroplanes

AD/BEECH 77/6 Engine Mount Assembly to Firewall Attach Bolts 12/80

Applicability: All model 77 with S/Nos. WA-1 to WA-156, WA-158 to WA-161, WA-163 to WA- 171, WA-173, WA-174, WA-177 and WA-178.

Requirement: Action in accordance with Beechcraft SI No. 1153.

Note: FAA AD 80-21-10 refers.

Compliance: Within 25 hours’ time in service after 30 October 1980.

Background: The engine mount assembly attachment bolts and barrel nuts may have threads which were damaged at initial factory installations.

Source text

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