Commonwealth legislation

AD/ENST 28/32 Amdt 1 - Tail Rotor Gearbox

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Requires immediate and recurring inspections of specified Enstrom F‑28 series tail‑rotor gearboxes for metal particles in the oil. Operators must inspect within 10 hours after 9 February 1990 or by 28 February 1990 (whichever is first) and re‑inspect every 100 flight hours thereafter; operators pay for and carry out the inspections and Civil Aviation Safety Authority enforces compliance. The directive responds to reported chipped/broken teeth and one total gear failure.

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AD/ENST 28/32 Amdt 1 - Tail Rotor Gearbox

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Enstrom F-28 Series Helicopters

AD/ENST 28/32

Amdt 1

Tail Rotor Gearbox 3/90 DM

Applicability: All model F28, F28A, F28C, F28C-2, F28F, 280, 280C, 280F and 280FX with tail rotor gearbox P/N 28-13500-1, 28-13525-1, -3 or -5 installed and containing spiral miter gear-set “Boston Gear XR-137-2YR or XR-137-2YL”.

Requirement: Inspect in accordance with Enstrom Service Directive Bulletin 0078.

Note: FAA AD 90-01-06 Amdt 39-6457 refers.

Compliance: Unless already accomplished, within 10 hours time in service after 9 February 1990 or by 28 February 1990, whichever occurs first. Thereafter, reinspect ALL tail rotor gearboxes in accordance with the requirement document at intervals not exceeding 100 hours time in service.

Background: The manufacturer has received two reported cases of chipped or broken teeth in the tail rotor gearbox, and one case of total gear failure. This AD requires a precautionary inspection of the gearbox oil for particulate metal contamination.

Although not called up in the Requirement document this Amendment extends compliance to the F-28 model and gearbox P/N 28-13500-1 in line with the now referenced FAA AD.

Source text

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

1 AD/ENST 28/32 Amdt 1 - Tail Rotor Gearbox