1AD/F50/67 - Main Landing Gear Drag Stay Tubes

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/F50/67 Main Landing Gear Drag Stay Tubes 8/95

Applicability: Fokker F27 Mk050 series aircraft fitted with main landing gear drag stay tube P/N 200684001.

Requirement: 1. Do an ultrasonic inspection of the drag stay tube in accordance with Dowty Aerospace Service Bulletin F50-32-50 to confirm that a straight bore tube is installed.

2. Remove all stepped bore tubes from service.

3. Re-identify all straight bore tubes with P/N 200684004.

Note 1: RLD AD 93-169/2 and Fokker SB F50-32-029 refer.

Compliance: 1. Inspect in accordance with Requirement 1 before 20 September 1995.

Inspect spare tubes before installation on an aircraft.

2. Remove from service in accordance with Requirement 2 or re-identify in accordance with Requirement 3 before further flight.

Background: One instance of a failed drag stay tube has been reported on F27 aircraft, F50 aircraft utilise an identical drag stay tube. The failure caused the landing gear to collapse and was attributed to a crack originating at an incorrectly machined step on the tube interior. This AD will ensure that all such tubes are identified and removed from service.