Commonwealth legislation

AD/DHC-3/17 - Engine Cooling

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This Act has been repealed and is no longer in force. It is retained for historical reference.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 safety order requires owners/operators of De Havilland DHC‑3 Otter aircraft in Australia to immediately modify the engine cooling system—upgrading augmentor tubes and intercylinder baffles—or, alternatively, demonstrate by flight testing or other means (with the test plan approved by the Secretary) that the engine remains within safe temperatures at Intercontinental Maximum Standard conditions. It’s aimed at preventing catastrophic engine overheating in Australia’s hot climate.

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Current sections

Direct links to the current provisions in AD/DHC-3/17 - Engine Cooling.

AD/DHC-3/17 - Engine Cooling

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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 DHC-3 (Otter) Series Aeroplanes

AD/DHC-3/17 Engine Cooling NK

Applicability: All models.

Requirement: 1. Unless it can be demonstrated, by flight test or otherwise, that adequate engine cooling is already provided, modify the augmentor tubes and intercylinder baffles to ensure that the maximum permissible engine cylinder head temperatures will not be exceeded in flight under Intercontinental Maximum Standard ambient temperature conditions.

Note: De Havilland Australia, TNS DHC-3 Aust. No 1 provides a satisfactory augmentor tube modification.

Tests conducted to justify engine cooling shall be carried out in accordance with a Flight Test Schedule approved by the Secretary.

Compliance: Forthwith.

Source text

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