Commonwealth legislation

AD/F50/44 - Fuselage - Flight Compartment Window Frames -2

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires operators of specified Fokker F50 serial numbers to modify the outside edges of flight‑compartment window and windshield frames and fit reinforcing plates, following the technical steps in Netherlands AD BLA 90‑002, before accumulating 15,000 pressurisation cycles. The directive responds to full‑scale fatigue tests that found cracks at sharp window‑frame edges and makes the specified structural modifications mandatory to remove local stress concentrations and avoid further cracking.

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Current sections

Direct links to the current provisions in AD/F50/44 - Fuselage - Flight Compartment Window Frames -2.

AD/F50/44 - Fuselage - Flight Compartment Window Frames -2

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F50 (F27 Mk 50) Series Aeroplanes

AD/F50/44 Fuselage - Flight Compartment Window Frames -2 9/91

Applicability: All F50 aircraft serial numbers 20103 to 20108 inclusive; 20110 to 20149 inclusive, 20151 to 20155 inclusive, 20159 and 20160.

Requirement: Action in accordance with the Technical Requirements of Netherlands AD BLA 90-002, dated 10 January 1990.

Compliance: Prior to accumulating 15,000 pressurization cycles.

Background: Full-scale fatigue tests indicated cracks occurring in the edges of the window frames.

These edges are sharp, which creates local stress concentrations. To remove these stress concentrations, AD/F50/43 was issued, calling for outside edges of the flight compartment window frames to be modified around the sliding windows and the direct vision windows.

This AD calls for a similar modification to the outside edges of the windshield frames and reinforcing plates to be installed to the window frames of the sliding windows, direct vision windows and windshields.

Source text

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

1 AD/F50/44 - Fuselage - Flight Compartment Window Frames -2