Commonwealth legislation

AD/G164/15 Amdt 1 - Rudder Main Spar

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This directive requires owners/operators of Schweizer (Grumman) Ag‑Cat G‑164/G‑164A/G‑164B aircraft to follow Grumman Service Bulletin 61 to access, visually inspect, and treat corrosion in the rudder’s main spar (including drilling and later sealing an access hole). The initial work and inspection have specific calendar deadlines and must be repeated annually for salt‑water operations or every three years otherwise. It responds to discovered hidden, severe corrosion that once caused a spar failure, replacing flight‑hour limits with time‑based inspections.

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AD/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.

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.

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

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

(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.

Source text

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

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