Commonwealth legislation

AD/F27/90 Amdt 1 - Pneumatic Isolating Valves - Inspection

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This AD requires owners/operators of Fokker F27s fitted with specified Dunlop pneumatic isolating valves to inspect valve bodies (using an inspection method approved by the Secretary) for internal cracks and to replace any valve body with a crack through more than one‑third of wall thickness before further flight. First inspection within 250 flight hours after 31 Mar 1977, then every 2400 hours. Operators bear inspection, replacement and downtime costs.

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AD/F27/90 Amdt 1 - Pneumatic Isolating Valves - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F27 Series Aeroplanes

AD/F27/90

Amdt 1

Pneumatic Isolating Valves - Inspection 7/77

Applicability: All models fitted with pneumatic isolating valves, Dunlop Aviation Division P/N ACM 17892 or ACM 26214.

Requirement: Inspect using a method approved by the Secretary, pneumatic isolating valves, Dunlops Aviation Division P/N ACM 17892 or ACM 26214, for presence of cracks around internal circumference of body, P/N ACM 16724, ACO 22631 or ACM 26573 in area of undercut in main body chamber. Valve bodies showing crack indications extending through more than one third of the wall thickness must be replaced before further flight.

Compliance: Within 250 hours time in service after 31 March 1977 and thereafter at intervals not exceeding 2400 hours time in service.

Source text

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

1 AD/F27/90 Amdt 1 - Pneumatic Isolating Valves - Inspection