Commonwealth legislation

AD/CESSNA 177/30 Amdt 1 - Wing Main Spar Carry-Through Section

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of all Cessna 177 models to open up and inspect the wing main-spar carry‑through forging (upper and lower surfaces) for corrosion, and to carry out any repairs only under Civil Aviation Safety Authority (CASA)‑approved repair schemes. It sets age‑based initial inspection timing and recurring inspection intervals, with longer intervals allowed where an approved corrosion‑protection scheme has been applied. Owners/operators pay for inspections and repairs; CASA approves repair schemes. The measure responds to reported corrosion that has in some cases affected wing structural integrity.

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AD/CESSNA 177/30 Amdt 1 - Wing Main Spar Carry-Through Section

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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 177 Series Aeroplanes

AD/CESSNA 177/30

Amdt 1

Applicability: All models.

Wing Main Spar Carry-Through Section 10/90

Requirement: 1. Gain access to the upper and lower surfaces of the wing carry through forging.

2. Inspect the whole wing carry-through forging for any indications of corrosion. Repairs to the wing carry- through forging shall be in accordance with Schemes approved by the Authority.

Compliance: Unless already accomplished in accordance with the initial issue of this Directive:

For aircraft over ten years time in service since date of manufacture: forthwith, and

b. For aircraft with less than ten years time in service since date of manufacture: before attaining ten years time in service, and

c. For all aircraft after initial inspection:

i) at periods not exceeding six years time in service, or

ii) where the spar carry-through has been subjected to an approved corrosion protection scheme: at periods not exceeding twelve years.

Background: There have been reports of corrosion in the wing spar carry-through forging on a number of aircraft. In two cases the corrosion was sufficiently advanced to adversely affect the structural integrity of the wing. Amendment 1 reflects the reported results from the initial issue of this Directive. This has enabled a reduction in the initial compliance time and an extension of the repeat inspection period.

Source text

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