Commonwealth legislation

AD/DHC-1/9 - Rudder Torque Tube Flange - Inspection

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

Owners/operators of De Havilland DHC‑1 Chipmunk aircraft in Australia must inspect the torque‑tube flange (P/N C1‑TR‑91) every 250 flight hours: remove the rudder, clean the flange, and check the curved shoulder and rivets by dye‑penetrant or with a 10x magnifier.

If any cracks are found the flange must be replaced before further flight — a fatigue‑detection rule to prevent rudder control failure.

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Current sections

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AD/DHC-1/9 - Rudder Torque Tube Flange - Inspection

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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 De Havilland DHC-1 (Chipmunk) Series Aeroplanes

AD/DHC-1/9 Rudder Torque Tube Flange - Inspection 9/57

Applicability: All models.

Requirement: 1. Remove the rudder, clean the Rudder Torque Flange P/N C1-TR-91, and inspect for cracks in the area of the shoulders on the semi- circular flange and the rivets securing the flange to the rudder torque tube. This inspection shall be made by either the dye penetrant method or visually with the aid of a 10X lens.

If cracking has occurred replace the flange before further flight; or 3. ANO 105.1.14.15.6.3.

Compliance: At intervals not exceeding 250 hours time in service.

Source text

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