COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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.
2. Tests conducted to justify engine cooling shall be carried out in accordance with a Flight Test Schedule approved by the Secretary.
Compliance: Forthwith.