Commonwealth legislation

AD/BELL 47/32 Amdt 2 - Main Rotor Mast Thrust Bearing

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legislative instrument

Plain English Summary

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Mandates recurring inspections of engine oil filters (and scavenge filter if fitted) for metal particles on all Bell 47 series helicopters fitted with main rotor mast thrust bearing P/N 47-130-110-1. If contamination is found, operators must locate the source, inspect/overhaul affected engine and transmission components per the Bell maintenance manual, and replace the thrust bearing if unserviceable.

Inspections are required every 25 flight hours and any required corrective action must be completed before further flight; the amendment extends applicability to Kawasaki-Bell helicopters.

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AD/BELL 47/32 Amdt 2 - Main Rotor Mast Thrust Bearing

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bell Helicopter Textron 47 (All Variants) Series Helicopters

AD/BELL 47/32

Amdt 2

Main Rotor Mast Thrust Bearing 10/86

Applicability: All model 47 series equipped with main rotor mast thrust bearing P/N 47-130-110-1.

Requirement: 1. Inspect the engine oil filter for evidence of metal particles. If the installation incorporates a scavenge oil filter, this filter shall also be inspected for metal particles.

If metal particles are found during any inspection of the oil filter(s) the source of the contaminant shall be located and eliminated and other components of the engine and transmission which may have been damaged by metal particles shall be inspected and overhauled as prescribed by the appropriate Bell maintenance manual. The main rotor mast thrust bearing P/N 47-130-110-1 shall be thoroughly inspected and replaced with a like component if found to be unserviceable.

Note: FAA AD 62-23-2 and Japan AD TCD 282-2 refers.

Compliance: Paragraph 1 - Every 25 hours time in service.

Paragraph 2 - Before further flight.

Background: Excessive wear and failure of the main rotor mast thrust bearing have occurred. This Directive has been amended to include Kawasaki-Bell Helicopters.

Source text

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

1 AD/BELL 47/32 Amdt 2 - Main Rotor Mast Thrust Bearing