COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
DHC-3 (Otter) Series Aeroplanes
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
AD/DHC-3/37 Magneto Cannon Plug 12/2001
Applicability: All Model DHC-3 aeroplanes powered by radial engines.
Requirement: 1. Perform a visual inspection of the firewall ignition plug and receptacle for proper lock wiring and security in accordance with the Accomplishment Instructions of Bombardier Aerospace de Havilland Otter Alert Service Bulletin A3/53, Revision ‘A’ dated 30 August 2001.
2. Replace any damaged parts detected during the Requirement 1 inspection.
3. Incorporate Maintenance Manual PSM 1-3-2 Temporary Revision TR14, dated 24 August 2001, into the periodic inspection of the aircraft approved maintenance schedule.
Note: Transport Canada AD CF-2001-37 refers.
Compliance: For Requirement 1 - Within 3 months or 110 hours time in service after the effective date of this Directive, whichever occurs first.
For Requirement 2 - Before further flight after the Requirement 1 inspection. For Requirement 3 - Within 3 months after the effective date of this Directive, This Airworthiness Directive becomes effective on 29 November 2001.
Background: Transport Canada has advised that a complete loss of both ignition systems occurred on a DHC-3 Otter when the lock wire hole in the ignition connector plug on the firewall broke out, allowing the plug to vibrate loose. A maintenance safety feature grounds out both magneto systems through a spring-loaded safety pin incorporated into the Cannon plug.
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
AD/DHC-3/37 (Continued)
This Directive requires a one time inspection of the ignition connector plug to detect any discrepancies and, if necessary, their rectification. The Directive also requires amendment of the Maintenance Manual.
Eugene Paul Holzapfel
Delegate of the Civil Aviation Safety Authority 17 October 2001
The above AD is notified in the Commonwealth of Australia Gazette on 7 November 2001.