Commonwealth legislation

AD/HU 269/93 - Tail Rotor Blade Spar

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This AD mandates inspection of specific Schweizer (Hughes) 269 tail rotor blades (parts 269A6035-21 and -23) for hidden spar corrosion per Schweizer Service Information Notice N-212, likely requiring x‑ray or detailed inspection. It applies to operators of affected 269 series helicopters and had to be completed within 600 flight hours or by 31 March 1989. It matters because unseen corrosion in spars can lead to blade failure, loss of tail rotor integrity, and possible crash.

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Current sections

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AD/HU 269/93 - Tail Rotor Blade Spar

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Schweizer (Hughes) 269 Series Helicopters

AD/HU 269/93 Tail Rotor Blade Spar 7/88

Applicability: All 269 series helicopters equipped with P/N 269A6035-21 or P/N 269A6035-23 tail rotor blades having serial numbers as listed in the Requirement document.

Requirement: Action in accordance with Schweizer Service Information Notice No N-212. Compliance: Unless already accomplished, within the next 600 flight hours or prior to 31 March

1989 whichever occurs first.

Background: Recent x-ray inspections of the affected tail rotor blade spars have revealed corrosion pits that were not evident during the periodic visual inspections for corrosion, required by HMI Appendix B. The manufacturer has determined that the pitting was caused by corrosion which occurred prior to the cadmium plate process on the blade spar.

Source text

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

1 AD/HU 269/93 - Tail Rotor Blade Spar