Commonwealth legislation

AD/DHC-1/14 - Flap Hinge Arms - Inspection and Modification

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This Act has been repealed and is no longer in force. It is retained for historical reference.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 mandatory Airworthiness Directive requires owners, operators and maintenance engineers of De Havilland DHC‑1 Chipmunk aircraft to inspect flap centre hinge arms for internal corrosion and, where necessary, clean/repair or replace them to ensure airworthiness. It also mandates drilling a small drain hole in each hinge arm immediately to prevent water ingress. Inspections must be repeated yearly. The measure prevents hinge failure that could cause flap loss and loss of control.

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Current sections

Direct links to the current provisions in AD/DHC-1/14 - Flap Hinge Arms - Inspection and Modification.

AD/DHC-1/14 - Flap Hinge Arms - Inspection and Modification

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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De Havilland DHC-1 (Chipmunk) Series Aeroplanes

AD/DHC-1/14 Flap Hinge Arms - Inspection and Modification

8/62

Applicability: All models. Requirement: 1. Inspecting:

(a) Remove the flap centre hinge arms (P/N C1.W.353 and C1.W.354) and inspect internally for the presence of corrosion.

(b) Hinge arms in which small areas of shallow surface corrosion are present shall be cleaned internally by sand blasting (or other effective means) and coated with a suitable protective medium before further flight.

(c) Hinge arms corroded in excess of the limits specified above shall be replaced with serviceable items before further flight.

Note: The internal inspection can be performed readily by inserting a 1/8 inch diameter intrascope or similar optical aid, through on of the 3/8 inch diameter holes in the base plate of the hinge arm. The hole may be elongated slightly to allow the probe of the intrascope to be inserted to the full depth of the hinge arm.

Modification: Drill a 1/8 inch diameter drain hole in the lower surface of the hinge arm at a distance of 0.75 inch from the ball race centreline.

Compliance: Inspection - At intervals not exceeding 12 months. Modification - Forthwith.

Source text

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

1 AD/DHC-1/14 - Flap Hinge Arms - Inspection and Modification