Commonwealth legislation

AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires owners/operators of specified Agusta A109A and A109AII helicopters fitted with certain main gearboxes to replace the Gleason crown bolts following Agusta Bollettino Tecnico No 109-77 Rev A. It imposes firm flight‑hour and calendar deadlines for replacement (see Compliance) after discovery of sheared bolts and magnesium flakes in the gearbox (Background). Owners/operators pay for and schedule the replacement; compliance is limited to listed serial‑number ranges and excludes gearboxes already noted as compliant (Applicability/Note).

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AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Agusta A109 Series Helicopters

AD/A109/17

Amdt 1

Main Gearbox Gleason Crown Bolts 4/93

Applicability: All A109A and A109 AII helicopters up to and including aircraft S/N 7437 fitted with main gearbox (MGB) 109-0400-02-1, -3 & -5 up to and including MGB S/N 363.

Note: MGB S/N 173, 176, 187, 207, 211, 267, 345 and 346 already comply.

Requirement: Unless previously carried out replace gleason crown bolts in accordance with mandatory Agusta Bollettino Tecnico No 109-77 Rev A.

Note: RAI AD 92-400 refers.

Compliance: 1. For gearboxes with less than 1100 hours’ time in service, prior to reaching 1200 hours’ time in service or by 31 January 1994, whichever occur first.

For gearboxes with more than 1200 hours’ time in service, within 300 hours’ time in service from 1 April 1993 or by 31 January 1994, whichever occurs first.

Background: During routine maintenance of the MGB oil filter magnesium flakes were noticed.

Disassembly of the gearbox revealed 4 bolts, P/N 109-0406-69-1, had sheared in the Gleason Crown assembly. This amendment raised in sequence to add a calendar time and to include the Italian AD reference.

Source text

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

1 AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts