1AD/DHC-6/69 Amdt 1 - Corrosion Prevention and Control

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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DHC-6 (Twin Otter) Series Aeroplanes

AD/DHC-6/69

Amdt 1

Corrosion Prevention and Control 13/99

Applicability: All Model DHC-6 aircraft.

Requirement: To maintain corrosion to Level 1 or better, accomplish the following:

Develop a schedule for accomplishing the Corrosion Tasks in accordance with Requirement 2 of this Directive.

2. In accordance with the following schedule, accomplish all Corrosion Tasks specified in Part 3 of the de Havilland DHC-6 Twin Otter Corrosion Prevention and Control Manual, PSM 1-6-5, Revision 1, dated 16 December 1998 (hereafter referred to as “the Manual”), by performing the seven basic tasks defined at paragraph 3.0 of the Manual.

The final deadline and rate of initial complete aircraft inspections are specified in the following table:

Applicable Aircraft Serial Numbers

Accomplishment Deadline for All Aircraft in Applicable S/N Range

Minimum Rate of Initial Inspections of Aircraft in Applicable S/N Range

001 to 199 31 December 1995 All aircraft

200 to 439 31 December 1996 50% or one (1) aircraft per calendar

year, whichever is greater

440 to 659 31 December 1998 25% or one (1) aircraft per calendar

year, whichever is greater

660 to 819 31 December 1999 20% or one (1) aircraft per calendar

year, whichever is greater

820 to 844 31 December 2002 Commencing 1 January 1999, 25% or

one (1) aircraft per calendar year, whichever is greater

Once the first CT commences, the aircraft is not to be returned to service until all CTs, excluding the float inspections, have been completed and any resulting rework and parts replacement have been completed. Floats that were on an aircraft just prior to the aircraft being inspected in accordance with the Manual do not have to be inspected simultaneously with that same aircraft; however, the aircraft cannot be returned to service with floats that have not had their applicable CTs completed and any resulting rework and parts replacement completed.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

When performing CTs with less than a five year Repeat Interval (R) after the initial inspection of the aircraft, all CTs with the same R interval are to be completed during one maintenance visit and any resulting rework and parts replacement must be performed before returning the aircraft or floats to service.