Commonwealth legislation

AD/F27/138 - Wing Lower Skin at Stringers 4 to 7

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Commonwealth

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legislative instrument

Plain English Summary

4/10 complexity

Requires X‑ray inspection of wing lower surface stringers 4–7 at specified wing stations and a modification of the rib‑to‑stringer connections per Fokker Service Bulletin F27/57‑70. Applies to all Fokker F27 aircraft except Mk 050. The directive responds to cracking found when implementing a related service bulletin, so inspections detect existing cracks and the mandated modification aims to prevent recurrence.

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Current sections

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AD/F27/138 - Wing Lower Skin at Stringers 4 to 7

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F27 Series Aeroplanes

AD/F27/138 Wing Lower Skin at Stringers 4 to 7 2/95

Applicability: All F27 aircraft (except Mk 050).

Requirement: 1. Perform an X-ray inspection of the wing lower surface stringers 4 to 7 at Wing Stations (WS) 11260, 11860, 12660, and 13460. Inspect in accordance with Fokker Service Bulletin (SB) F27/57-70 paragraph 2 part 2.

Modify the wing lower surface rib to stringer connections where stringers 4 to 7 join to the ribs at WS 11260, 11860, 12660, and 13460. Modify in accordance with Fokker SB F27/57-70 paragraph 2 part 1.

Note: RLD AD 93-094(A) refers.

Compliance: 1. Inspect in accordance with Requirement 1 before 30000 flights or within 2000 flights after 2 February 1995 whichever is the later. Re-inspect at intervals not to exceed 4000 flights until modified in accordance with Requirement 2.

Modify in accordance with Requirement 2 before 30000 flights or before 31 July 1996 whichever occurs later.

Background: When incorporating SB F27/57-68 (cracking of wing upper surface stringers) some operators discovered cracking in the lower surface stringers. Inspection and modification are required to resolve the problem.

Source text

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

1 AD/F27/138 - Wing Lower Skin at Stringers 4 to 7

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Fokker F27 Series Aeroplanes

AD/F27/138 Wing Lower Skin at Stringers 4 to 7 2/95

Applicability: All F27 aircraft (except Mk 050).

Modify the wing lower surface rib to stringer connections where stringers 4 to 7 join to the ribs at WS 11260, 11860, 12660, and 13460. Modify in accordance with Fokker SB F27/57-70 paragraph 2 part 1.

Note: RLD AD 93-094(A) refers.

Modify in accordance with Requirement 2 before 30000 flights or before 31 July 1996 whichever occurs later.