Commonwealth legislation

AD/HU 269/94 - Main Rotor Pitch Bearing Snap Ring Lockwasher

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

1/10 complexity

What this is: A mandatory safety inspection order (called an Airworthiness Directive) for specific Schweizer (Hughes) 269C helicopters.

Who it affects: Owners and operators of Model 269C helicopters with serial numbers 1166 through 1336.

What it requires:

Inspect the main rotor pitch bearing assembly for a missing small metal part called a "snap ring lockwasher" (part number SL61W9F)
Use the manufacturer's inspection procedure outlined in Schweizer Service Information Notice No. N-227
Deadline: Complete the inspection within 50 flight hours after 8 November 1989, or before 31 December 1989 — whichever comes first
Exception: Skip this if you've already done the inspection

Why it matters: The manufacturer discovered that this tiny lockwasher might be missing from the bearing assembly. If it's missing, the main rotor pitch bearing housing could separate from the rotor blade during flight — which could cause the helicopter to crash.

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Direct links to the current provisions in AD/HU 269/94 - Main Rotor Pitch Bearing Snap Ring Lockwasher.

AD/HU 269/94 - Main Rotor Pitch Bearing Snap Ring Lockwasher

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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 Schweizer (Hughes) 269 Series Helicopters

AD/HU 269/94 Main Rotor Pitch Bearing Snap Ring Lockwasher 13/89

Applicability: Model 269C series with serial numbers 1166 through 1336.

Requirement: Unless already accomplished; inspect in accordance with Schweizer SIN No. N-227. Compliance: Within 50 hours time in service after 8 November 1989 or prior to 31 December

1989, whichever occurs first.

Background: The manufacturer has determined that there may be a possibility that the main rotor pitch bearing snap ring lockwasher (SL61W9F) is missing from the bearing stackup. This condition could result in separation of the main rotor pitch bearing housing assembly and rotor blade.

Source text

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