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:
- 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.