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

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

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:

1. 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.