Document ID: chunk:federal_register_of_legislation:F2006B09182:body:0
Version: federal_register_of_legislation:F2006B09182
Segment Type: other
Provision Reference: 
Character Range: 0–2133

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

 Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

 AD/DHC-8/27
 Amdt 1

 Passenger Service Units Printed Circuit Boards 2/94

            Applicability: All DHC-8 aircraft serial number 3 to 369, which have accumulated more than 600 flight hours and which are fitted with Passenger Service Units (PSU) with the following part numbers:

10-1418-1  10-1081-1  10-1081-4  10-1081-7  10-1418-2
10-1081-2  10-1081-5  10-1081-8  10-1081-3  10-1081-6

            Requirement: Action in accordance with Bombardier Regional Aircraft Division Alert Service Bulletin A8-33-30 Revision A dated 18 December 1992.

            Note: Transport Canada CF-93-01R1 dated 3 December 1993 refers.

            Compliance: The original compliance was prior to 1 May 1993, unless already accomplished in the 300 flight hours before 1 April 1993 and thereafter at intervals not to exceed 600 flight hours until Modification No 8/1950 is incorporated.

            The compliance for this amendment is: unless previously accomplished in accordance with the previous issue of this Directive, then prior to 3 March 1994 and thereafter at intervals not to exceed 600 hours time in service, until Modification No 8/1950 is incorporated in accordance with Bombardier Regional Aircraft Division Service Bulletin 8-33-34 dated 10 August 1993.

            Background: Signs of overheating of the PSU printed circuit boards (PCB) and power supply connectors have been reported by DHC-8 operators. An investigation has indicated that this overheat problem was caused by moisture ingress into the PSU connectors which led to corrosion of the PCB pins/connector interfaces. The corroded PCB and/or connectors, if not detected and corrected, may lead to an excessive overheat condition and a potential fire hazard.

            This amendment clarifies the aircraft serial number range, increases the number of affected PSUs and advises the Service Bulletin Number which provides terminating action.