Commonwealth legislation

AD/R22/16 Amdt 4 - Lower Actuator Bearing

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

2/10 complexity

This Airworthiness Directive requires all Robinson R22 owners/operators to inspect the lower actuator bearing and ensure the original ball bearing has been replaced with the safer roller bearing to prevent catastrophic in‑flight engine loss. If the upgraded bearing isn’t present or identification isn’t possible, follow Robinson Service Bulletin 63 to correct it. The initial inspection was required within 25 flight hours of 8 Dec 1994 (or by 31 Jan 1995) and must be repeated at each maintenance‑release thereafter.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/R22/16 Amdt 4 - Lower Actuator Bearing.

AD/R22/16 Amdt 4 - Lower Actuator Bearing

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Robinson R22 Series Helicopters

AD/R22/16

Amdt 4

Lower Actuator Bearing 13/94

Applicability: All series R22 helicopters.

Requirement: Inspect lower bearing assembly P/N A007-3 for fitment of roller bearing assembly P/N A181-4. If the bearing P/N is unknown or if roller bearing assembly P/N A181-4 has not been fitted, action in accordance with Robinson SB 63.

Compliance: Unless previously carried out, within 25 hours time in service from 8 December 1994 or by 31 January 1995, whichever occurs first. Thereafter, reinspect at each maintenance release issue.

Background: Due to the low in-service life of the fan shaft ball bearing the manufacturer has previously introduced a replacement roller bearing. Failure of a fan shaft bearing can resulted in total loss of engine power to the main rotor. This amendment mandates fitment of the roller bearing and a repetitive check to confirm the roller bearing installation after failure of a commercial ball bearing caused a helicopter accident.

Source text

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

1 AD/R22/16 Amdt 4 - Lower Actuator Bearing