Commonwealth legislation

AD/DHC-6/8 Amdt 1 - Airspeed Placard Installation and Left Elevator Trim Tab - Inspection

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This airworthiness directive requires owners/operators of DHC‑6 (Twin Otter) aeroplanes (unless fitted with the listed De Havilland mods) to fit a cockpit airspeed placard limiting speed to 125 Kts IAS and to inspect, adjust and monitor the left elevator trim tab for correct free play and skin damage. Operators must have maintenance personnel adjust the push‑rod/bolt relationship and ensure free play does not exceed 0.1 inch (Requirements 1–3: forthwith; Requirement 4: before each flight).

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AD/DHC-6/8 Amdt 1 - Airspeed Placard Installation and Left Elevator Trim Tab - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/8

Amdt 1

Airspeed Placard Installation and Left Elevator Trim Tab - Inspection

1/68

Applicability: All models not incorporating De Havilland of Canada Mod. Bulletins 6/1120, 6/1135 and 6/1142.

Requirement: 1. Install the following placard in fuell view of the pilot: “SPEED SHALL NOT EXCEED 125 KTS, I.A.S.”

2. On the left elevator trim tab assembly remove the bolt between the push rod and the elevator tab operating lever; operate the tab cockpit control until the screw jack in the elevator is fully retracted and adjust the push rod in order that the bolt can be re-inserted in the lowered tab without exerting pressure on the tab.

3. Ascertain that the total free play measured adjacent to the operating lever with the trim tab in the neutral position does not exceed 0.1 inch at the trailing edge of the tab.

4. Visually inspect the elevator trim tab top and bottom skins for diagonal buckling or concavity other than manufactured flutes.

Compliance: For paragraphs 1, 2 and 3 - Forthwith.

For paragraph 4 - Before each flight.

Source text

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

1 AD/DHC-6/8 Amdt 1 - Airspeed Placard Installation and Left Elevator Trim Tab - Inspection