Commonwealth legislation

AD/HILLER 12/30 Amdt 2 - Main Rotor Assembly

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Commonwealth

Collection

legislative instrument

Plain English Summary

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This AD requires operators of Hiller UH‑12 series helicopters (and specified STC conversions) fitted with Parsons P/No. 2253‑1101 main rotor blade assemblies to follow Rogerson Hiller SB UH12‑51‑6: add a daily visual inspection (pilot may perform), shorten dye‑penetrant inspections from 100 to 25 hours TIS, add a coin‑tapping check for bond separation/voids, and require overhaul. It targets bond separation that can lead to spar cracking. Operators bear increased inspection, maintenance and recordkeeping costs; one daily check may be delegated to pilots with an entry in the Maintenance Release.

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Current sections

Direct links to the current provisions in AD/HILLER 12/30 Amdt 2 - Main Rotor Assembly.

AD/HILLER 12/30 Amdt 2 - Main Rotor Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Hiller UH-12 Series Helicopters

AD/HILLER 12/30

Amdt 2

Main Rotor Assembly 8/86

Applicability: All models UH-12D, UH-12E, UH-12E4, OH-23F, OH-23G and all models converted by STC SH 178WE and STC SH 177 WE equipped with main rotor blades assembly Parsons P/No. 2253-1101.

Requirement: Action in accordance with Rogerson Hiller SB UH12-51-6 Revision dated 19 December 1985.

Note: FAA AD 80-14-12 Amdt 39-3836 refers.

Compliance: As per Requirement Document.

Note: The Daily Inspection may be accomplished by the pilot in command, in which case an entry and certification for this AD shall be made in Col. 2 Part 3 of the Maintenance Release on each occasion.

Background: The main rotor blade spar may develop bond separation and voids leading to spar cracking. This Amendment introduces a daily visual inspection, reduces the dye penetrant inspection period from 100 hours’ time in service to 25 hours’ time in service, adds a bond separation and void inspection by “coin tapping” and specifies an overhaul requirement.

Source text

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

1 AD/HILLER 12/30 Amdt 2 - Main Rotor Assembly