1AD/SF340/41 - Elevator and Aileron Coves

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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SAAB SF340 Series Aeroplanes

AD/SF340/41 Elevator and Aileron Coves 2/94

Applicability: Model SF340A with serial numbers 004 through 159 Model 340B with serial numbers 160 through 260.

Requirement: Action in accordance with SAAB Service Bulletin 340-51-012.

Note: LFV AD 1-060 refers.

Compliance: As specified in the Requirement Document with the initial detailed inspection to be performed within 500 hours time in service after 3 February 1994.

Background: A report was received of the elevators of an aircraft requiring more control force than normal. An investigation revealed that water ingress had occurred between the composite structure and the aluminium foil of the cove, and contact was made between the foil and the elevator when the water froze. This condition may ultimately lead to jamming of the control surface.