Commonwealth legislation

AD/B-2/25 - Tail Rotor Blade - Inspection

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Commonwealth

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legislative instrument

Plain English Summary

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This airworthiness directive requires owners/operators of Brantly B‑2 helicopters (serial numbers 454 and below) to remove each tail‑rotor blade assembly, make a low‑temperature impression and visually inspect a specified shoulder relief radius and circumferential tool marks, and to remove from service any blade that fails the numeric limits. (Requirement paras 1–4.)

The cost and operational burden fall on owners/operators and maintenance staff for disassembly, inspection (wax impression and magnifier) and replacement where required; work must follow the Brantly Model B2B Maintenance Manual and be done forthwith. (Applicability; Requirement 5; Compliance.)

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AD/B-2/25 - Tail Rotor Blade - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Brantly B-2 Series Helicopters

AD/B-2/25 Tail Rotor Blade - Inspection 1/66

Applicability: All model B-2 series S/Nos. 454 and below.

Requirement: 1. Remove and disassemble the tail rotor blade assembly P/N B2-111-11 from hub and thrust bearings in accordance with Brantly Model B2B Maintenance Manual.

2. Using letter sealing wax or any other hard setting low temperature melting (250oF or less) material, make an impression of the thrust bearing shoulder relief radius in the grip at blade station 3.06 and inspect for a radius less than 0.020 inches.

3. Using at least a two power magnifying glass, inspect for sharp circumferential tool marks deeper than 0.010 inches.

4. Remove from service any tail rotor blade with tool marks deeper than 0.010 inches or relief radius less than 0.020 inches, before further flight.

5. Reinstall any tail rotor blade with tool marks not deeper than 0.010 inches or relief radius not less than 0.020 inches in accordance with Brantly Model B2B Maintenance Manual; or

FAA AD 65-28-1.

Compliance: Forthwith.

Source text

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

1 AD/B-2/25 - Tail Rotor Blade - Inspection