Commonwealth legislation

AD/DHC-8/27 Amdt 1 - Passenger Service Units Printed Circuit Boards

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legislative instrument

Plain English Summary

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This directive requires DHC‑8 operators (aircraft s/n 3–369 with specified Passenger Service Units) to carry out recurring inspections of PSU printed circuit boards and to install a terminating modification per Bombardier service bulletins (Requirement; Compliance). It responds to moisture ingress and connector corrosion that can overheat PSUs and create a fire hazard (Background). Operators pay for inspections, repairs and the terminating mod; inspections recur every 600 flight hours until Modification No 8/1950 is incorporated (Compliance).

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AD/DHC-8/27 Amdt 1 - Passenger Service Units Printed Circuit Boards

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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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.

Source text

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

1 AD/DHC-8/27 Amdt 1 - Passenger Service Units Printed Circuit Boards