1AD/B767/89 Amdt 1 - Thrust Reverser Control System Operational Checks

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AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B767/89 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

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Boeing 767 Series Aeroplanes

AD/B767/89

Amdt 1

Thrust Reverser Control System Operational Checks

11/2002

Applicability: All Boeing 767 series aeroplanes powered by Pratt and Whitney JTD9D-7R4 series engines, or General Electric CF6-80A series engines, incorporating Boeing Service Bulletin 767-78-0061 Revision 4 or 767-78-0060 Revision 4 respectively.

Requirement: 1. Carry out a functional test of the thrust reverser synch- lock system that satisfies the intent of the test specified in FAA AD 94-16-03 paragraph (e).

2. Repeat Requirement 1 functional test.

3. a. If any discrepancy is found during any functional test required by Requirement 1 or 2, correct the discrepancy in accordance with approved maintenance data; OR
b. Operate the aeroplane in accordance with the conditions and limitations of the Minimum Equipment List (MEL), applicable to the registration mark of the aeroplane, provided the MEL only approves dispatch with:

no more than one thrust reverser on the aeroplane inoperative; and

ii. no synch- lock on the aeroplane is in an unlocked position; and

iii. the thrust reverser is deactivated in accordance with approved maintenance data.

c. If the aeroplane is operated in accordance with Requirement 3 (b), correct the discrepancies found as required by Requirement 3(a).

d. Repeat the functional test required by Requirement 1 or 2, as applicable, after correction of the discrepancies under Requirement 3(c).

e. Carry out Requirement 3(a) if any functional test carried out under Requirement 3 (d) was unsuccessful.

Note: FAA AD 94-16-03 Amdt 39-8993 refers and supersedes FAA AD 92-03-03.

Boeing 767 Series Aeroplanes

AD/B767/89 Amdt 1 (continued)

Compliance: For Requirement 1: Unless previously accomplished, within 4000 hours time in service since installation of the thrust reverser synch-lock required by AD/B767/63 amdt 3, or within 4000 hours time in service from the last functional test of the synch- lock system, whichever occurs later.