Commonwealth legislation

AD/BELL 47/75 Amdt 2 - Control Tubes

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

Requires owners/operators of all Bell Helicopter Textron 47 series helicopters to inspect control tubes for corrosion by one of three methods (external visual check, radiographic inspection, or remove lower end fittings to inspect internally) on set schedules. It affects aircraft operators who must arrange and pay for inspections and any repairs; the action follows manufacturer reports of control-tube failures caused by corrosion.

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AD/BELL 47/75 Amdt 2 - Control Tubes

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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 47 (All Variants) Series Helicopters

AD/BELL 47/75

Amdt 2

Applicability: All models.

Control Tubes 10/86

Requirement: 1. Visually inspect the control tubes referenced in Bell SB 47-11-73-1 and Kawasaki- Bell S.B. KSB-Bell 334 for evidence of corrosion pits, particularly in the lower four (4) inches of each tube assembly; or

2. Inspect the control tubes referenced in Bell SB 47-11-73-1 and Kawasaki-Bell S.B. KSB-Bell 334 for evidence of corrosion using a suitable radiographic technique; or

3. Remove the lower end fittings from the control tubes and visually inspect the internal surface of the tube for evidence of corrosion.

Compliance: 1. Within 25 hours time in service after 31 December 1973 and thereafter at intervals not exceeding 50 hours time in service.

2 & 3. Within 25 hours time in service after 31 December 1973 and thereafter at intervals not exceeding 3 years.

Background: The manufacturer has received reports of failure of fore and aft control tubes caused by corrosion. 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.