COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES De Havilland Piston Engines AD/DHE/27 Fuel Control Unit - Boost Capsule - Replacement 2/84 Applicability: All Gipsy Queen Series 70. Document: Hants and Sussex: Gipsy Modification 3014 Issue 2. Compliance: In accordance with requirement document. Background: This directive is issued to require compliance with the quoted modification to preclude boost capsule failure causing loss of engine power.