Commonwealth legislation

AD/CESSNA 550/1 - Wing Main Spar - Inspection and Modification

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legislative instrument

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This airworthiness directive requires owners/operators of certain Cessna 550 (Citation II) aeroplanes (serial numbers listed in the cited Cessna service letter) to inspect the wing main spar at wing station 37 for fatigue cracks and, if a crack reaches 0.30 inches, to carry out a prescribed modification. After modification, the spar must be visually checked at intervals not exceeding 1,200 hours or 1,200 landings. Owners/operators and their maintenance organisations must schedule, perform and pay for the inspections and any modification per the referenced Cessna documents.

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AD/CESSNA 550/1 - Wing Main Spar - Inspection and Modification

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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 Cessna 550 (Citation II) Series Aeroplanes

AD/CESSNA 550/1 Wing Main Spar - Inspection and Modification

Applicability: Model 550 series aeroplanes with S/Nos. as referenced in SL No. 550-57-1. Requirement: 1. Inspect the wing spar upper and lower cap in the area of wing station 37 in

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accordance with Cessna SL No. 550-57-1 Rev. 1 dated 1 May 1979. FAA AD 79-12-06 also refers.

2. Inspect and modify in accordance with Cessna SB No. 550-57-3 Rev. 1 dated 28 March 1980.

3. Visually inspect for further cracks the wing main spar upper and lower caps of aircraft modified in accordance with SB No. 550-57-3 Rev. 1 in the area of the WS 37 modification.

Compliance: For Para. 1 - As detailed in the requirement document.

For Para. 2 - In accordance with the requirement document when any crack monitored under the provisions of Para. 1 reaches or exceeds 0.30 inches in length.

Note: The modification may be carried out at any time (i.e. not necessarily at crack detection) and thus exempt the aircraft from the inspections under Para. 1.

For Para. 3 - At or prior to exceeding 1200 hours after modification and thereafter at intervals not exceeding 1200 hours or 1200 landings whichever occurs first.

Background: The results of full-scale fatigue testing and the inspection of several high time Citation aircraft have revealed small fatigue cracks in the main spar upper and lower caps at WS 37. In service cracks were found in 8 instances in the upper cap and in 1 instance in the lower cap.

Source text

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