Commonwealth legislation

AD/WRI/1 - Accessory Drive Gear - Modification

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

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What it changes: Requires owners/operators of Wright GR1820-200 engines to either replace accessory drive gear P/N 62336 with modified P/N 62336J, convert a two‑speed supercharger to single‑speed, or have new gears reworked and crack‑tested; in‑service unmodified gears must be rejected. (Reqs 1–3.)

Who it affects and why it matters: This directly affects aircraft operators and maintenance providers of GR1820‑200 engines, who must pay for parts, rework, inspections and immediate compliance to meet airworthiness standards.

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Current sections

Direct links to the current provisions in AD/WRI/1 - Accessory Drive Gear - Modification.

AD/WRI/1 - Accessory Drive Gear - Modification

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Wright Piston Engines

AD/WRI/1 Accessory Drive Gear - Modification NK

Applicability: GR1820-200 series.

Requirement: 1. Modify engines fitted with a two speed supercharger drive in accordance with either of the following sub-paragraphs:

(a) Replace accessory drive gear P/N 62336 with modified gear P/N 62336J; or

(b) Modify the supercharger drive for single speed operation only.

2. Modify engines fitted with a single speed supercharger drive in accordance with either of the following sub-paragraphs:

(a) Replace accessory drive gear P/N 62336 with modified gear P/N 62336J; or

(b) Replace existing gear P/N 62336 with a new gear P/N 62336 which has been reworked in accordance with paragraph 3 of this Order.

3. Rework gears P/N 62336 to remove all signs of grinding marks in the fillets at the roots of the gear teeth. Great care must be taken during the rework and the polishing operation must be confined to the radius of each fillet and must NOT extend up the flank of the tooth. The gear shall be checked with the aid of an approved crack detecting apparatus prior to installation in the engine. New gears only shall be reworked and unmodified gears which have been in service shall be rejected; or

ANO 106.1.17.4.5.1

Compliance: Forthwith.

Source text

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

1 AD/WRI/1 - Accessory Drive Gear - Modification