Commonwealth legislation

AD/F50/52 - Cockpit Window Post Attach Angles

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive orders owners/operators of specified Fokker F50 (F27 Mk 50) aeroplanes (listed serial numbers) to replace the 16 aluminium cockpit window post attach angles with corrosion‑resistant steel in accordance with Fokker Service Bulletin F50‑53‑029. The Civil Aviation Safety Authority requires the modification before the aircraft reach 30,000 flight cycles to address fatigue cracks found in test cycles. Operators arrange and pay for the work; the directive changes maintenance obligations and parts procurement timing.

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AD/F50/52 - Cockpit Window Post Attach Angles

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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 Fokker F50 (F27 Mk 50) Series Aeroplanes

AD/F50/52 Cockpit Window Post Attach Angles 4/92

Applicability: F27 Mk 50 series serial numbers:

20103 to 20108 inclusive;

20110 to 20149 inclusive; and

20151 and 20152.

Requirement: Modify in accordance with Fokker Service Bulletin F50-53-029 dated 1 August 1990.

Note: RLD AD (BLA) 90-084 refers.

Compliance: Required before accumulating 30 000 flight cycles.

Background: During a full scale fatigue test of the forward fuselage, five of the attachment angles at the upper and lower ends of the window posts showed fatigue cracks at 45 000 simulated flight cycles. To extend the fatigue life of the window posts the 16 existing aluminium alloy angles are replaced by corrosion resistant steel angles.

Source text

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