1AD/DHC-8/55 - Horizontal Stabiliser Skin Disbonding Follow-up

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-8/55 Horizontal Stabiliser Skin Disbonding Follow-up 12/98

Applicability: All DHC-8, Series 100 and 300 aircraft which have horizontal stabilisers, serial numbers CAP 003 through CAP 214 fitted.

Requirement: 1. For Horizontal Stabilisers, Serial Numbers CAP 003 through CAP 050:

Perform an Ultrasonic Bond Inspection of the upper and lower skin panels (part number 85510025 and 85510026) for disbonding as outlined in de Havilland Non Destructive Testing Manual, PSM 1-8-7A, Part 5, Section 55-00-01.

2. For Horizontal Stabilisers, Serial Numbers CAP 003 through CAP 214:

The inspection interval in the Airworthiness Limitations List (AWL) is reduced from 3 years to 2 years in accordance with Temporary Revision (TR) No. AWL 63 of the AWL in the Maintenance Program Manual PSM 1-8-7 (for Series 100 aircraft) and TR No. AWL 3-70 of the AWL in the Maintenance Program Manual PSM 1-83-7 (for Series 300 aircraft). These inspections are to be phased in as specified in Compliance paragraph 2.

Disbonds beyond the local disbond limits defined in de Havilland document PSM 1- 8-7A, Part 5, Section 55-00-01 shall be repaired before further flight.

Note: Transport Canada AD CF-98-24 refers.

Compliance: 1 Unless already accomplished within the last 3 months, before 5 December 1998; repeat between 12 and 14 months after the initial inspection.

2. a. For Horizontal Stabilisers Serial Number CAP 003 through CAP 050:

Following the Compliance 1 repeat inspection, inspect within the next 2 years and thereafter at intervals not to exceed 2 years.

2. b. For Horizontal Stabilisers Serial Numbers CAP 051 through CAP 214:

Where the next inspection falls due in 1998, unless already accomplished, perform the inspection as scheduled and repeat thereafter at intervals not to exceed 2 years.

ii. Where the next inspection falls due in 1999, unless already accomplished, perform the inspection no later than 31 December 1998 and repeat thereafter at intervals not to exceed 2 years.

iii. Where the next inspection falls due after 1 January 2001, perform the inspection 1 year earlier and repeat thereafter at intervals not to exceed 2 years.

This Airworthiness Directive becomes effective on 5 November 1998.

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