1AD/G164/15 Amdt 1 - Rudder Main Spar

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes

AD/G164/15

Amdt 1

Rudder Main Spar 4/94

Applicability: Model G-164 with serial numbers 1 through 400.

Model G-164A with serial numbers 401 through 1674. Model G-164B with serial numbers 1B through 79B.

Requirement: 1. Action in accordance with Grumman Service Bulletin 61.

2. Visually inspect the interior and exterior of the rudder main tubular spar for corrosion.

Note: The hole fabricated through the bottom of the rudder fitting during compliance with SB 61, is required to be sealed after the spar is inspected and corrosion inhibited.

Compliance: 1. Unless already accomplished, prior to 30 June 1994.

2. (a) For aircraft operating in a salt water environment:

Prior to 31 March 1995, and thereafter at intervals not to exceed one calendar year.

2. (b) For all other aircraft:

Prior to 31 March 1995, and thereafter at intervals not to exceed three calendar years.

Background: The manufacturer received reports of significant corrosion on the main tubular spar of the rudder assembly. Amendment 1 is issued to introduce a calendar time compliance in lieu of operating time, a separate compliance for aircraft that are operating in a severe corrosive environment, and an additional internal inspection of the spar for corrosion in response to a local report of a rudder main spar failure that was precipitated by internal corrosion.