Commonwealth legislation

AD/BELL 212/54 - Main Transmission Lower Planetary Spider

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This airworthiness directive requires operators of Bell 212 helicopters fitted with main transmission lower planetary spider P/N 412-040-785-101 to remove (retire) that part from service on a fixed timetable. Compliance requires retirement before 2,500 hours time-in-service or within 100 hours after 2 February 1995, whichever is later. The measure is intended to prevent in-service failures identified in manufacturer fatigue tests; the operator bears the cost and responsibility of replacing the retired item.

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/BELL 212/54 - Main Transmission Lower Planetary Spider.

AD/BELL 212/54 - Main Transmission Lower Planetary Spider

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Bell Helicopter Textron 212 Series Helicopters

AD/BELL 212/54 Main Transmission Lower Planetary Spider 2/95

Applicability: All Bell Helicopter Textron 212 Series Helicopters with main transmission lower planetary spider P/N 412-040-785-101 installed.

Requirement: Retire the spider from service.

Note 1: FAA AD 94-18-09 Amdt 39-9022 and Bell Alert Service Bulletin ASB 212- 93-83 Revision A refer.

Note 2: The life of Spider P/N 412-040-785-103 is not limited by this AD.

Compliance: Retire the spiders before 2500 hours time in service or within 100 hours time in service after 2 February 1995, whichever is the later.

Background: Five failures of the main transmission lower planetary spider have been experienced during the manufacturer’s fatigue tests. Accordingly a fatigue life has been established to prevent in service failures.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source

Source text

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

1 AD/BELL 212/54 - Main Transmission Lower Planetary Spider

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell Helicopter Textron 212 Series Helicopters

AD/BELL 212/54 Main Transmission Lower Planetary Spider 2/95

Applicability: All Bell Helicopter Textron 212 Series Helicopters with main transmission lower planetary spider P/N 412-040-785-101 installed.

Requirement: Retire the spider from service.

Note 1: FAA AD 94-18-09 Amdt 39-9022 and Bell Alert Service Bulletin ASB 212- 93-83 Revision A refer.

Note 2: The life of Spider P/N 412-040-785-103 is not limited by this AD.

Compliance: Retire the spiders before 2500 hours time in service or within 100 hours time in service after 2 February 1995, whichever is the later.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES