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-8/34
Amdt 1
Black Thermal Insulation 4/95
Applicability: DHC-8 aircraft, models and serial numbers as listed in the Requirement Table.
Requirement: Remove all black film thermal insulation blankets from the aircraft fuselage and flight compartment and replace them with AN4C Aluminized (silver) film insulation blankets; in accordance with the Part III Accomplishment Instructions of the Bombardier Inc., de Havilland Dash 8 Service Bulletins listed in the following table:
DHC-8 Models | Serial Numbers | Service Bulletin No | Date |
102, 103, & 106 | 003 to 353 | 8-25-89 Revision E | 6 July 94 |
102, 103, & 106 | 003 to 371 | 8-25-90 Revision C | 5 July 94 |
102, 103, 106, 301, 311, & 314 | 003 to 337, 339, 341 to 347, 349, 350, 351, 353, & 356 | 8-25-91 Revision D | 20 July 94 |
301, 311, & 314 | 100 to 336, 342, 350, & 356 | 8-25-92 Revision E | 20 July 94 |
301, 311, & 314 | 10 to 336, 342, 350, 365, & 370 | 8-25-93 Revision C | 20 July 94 |
Note 1: Transport Canada AD CF-94-08R1 refers.
Note 2: This Directive is not applicable to aircraft that have had all three de Havilland Modifications 8/2004, 8/2006, and 8/2007 incorporated during manufacture.
Compliance: Unless already accomplished in accordance with the previous issue of this Directive, prior to 3 September 1994 or as indicated in Part 1.D of the service bulletins listed in the Requirement Table, whichever occurs later.
The Compliance of the previous issue of this Directive remains unchanged. This Amendment is effective from 30 March 1995.
Background: Operators have reported corrosion forming on areas of the aircraft where black film thermal insulation blankets are being used. De Havilland’s investigation found that the black film, which covers these insulation blankets, contains carbon. If condensation is present, corrosion may occur in places where the black film is in contact with any aluminium structure.
Amendment 1 is issued in response to a revision of the Transport Canada AD which changes the applicability to agree with the applicability of the latest revision of the mandated service bulletins.