Document ID: chunk:federal_register_of_legislation:F2006B03174:body:0:p3
Version: federal_register_of_legislation:F2006B03174
Segment Type: other
Provision Reference: 
Character Range: 5879–9093

Prior to further flight, after the Requirement 12 functional test. This Airworthiness Directive becomes effective on 3 October 2002.
           Background: This Directive requires inspections, tests, and modifications of the thrust reverser control and indication system and wiring on each engine, together with any necessary corrective action. This Directive also requires installation of a terminating modification, together with repetitive functional tests of that installation to detect discrepancies and, if necessary, any repairs.

           The issue of the Directive is prompted by the results of a safety review conducted by the Federal Aviation Administration, which revealed that in- flight deployment of a thrust reverser could result in significant reduction in aeroplane controllability.
           Compliance with this Directive is intended to ensure the integrity of the fail-safe features of the thrust reverser system by preventing possible failure modes, which could result in inadvertent deployment of a thrust reverser during flight and consequent reduced controllability of the aeroplane.

 James Coyne
 Delegate of the Civil Aviation Safety Authority 20 August 2002

 The above AD is notified in the Commonwealth of Australia Gazette on 11 September 2002.

Page 3 of 3

 AD/B747/278
 Appendix 1

 Thrust Reverser Sync-Lock Integrity Test 10/2002

               1. General

                  1. Equipment and Materials

                     1. Thrust reverser flex drive adapter - 196K8004-1 or 196K8004-3; Rohr Industries, Inc., Chula Vista, California 92012.

              2.        Thrust Reverser Sync-Lock Integrity Test

                 B.       Prepare for the thrust reverser sync lock test.

                     1. Open applicable T/R CONT & BLEED SYS circuit breaker on P12 circuit breaker panel.

                     2. Open fan cowl doors (Ref 71-11-02, Maintenance Practices).

3.        Check that forward and aft circumferential latches and all tension latches are engaged and locked.

4.        Depress drive unit latch operating arm and retain by engaging latch arm (detail C).

5.        Disengage stow latch hook on left and right thrust reversers (detail D).

6.        On either lower slave actuator (detail B), either remove coverplate from forward drive pad or remove locking plug from lower drive pad.

7.        Move left-hand sync- lock lever to the unlocked position.

8.        Using appropriate drive adapter (196K8004-1 at forward drive pad or 196K8004-3 at lower drive pad), attempt to manually deploy sleeves.

                   CAUTION : DO NOT APPLY A TORQUE LOAD OF MORE THAN 75 POUND-INCHES TO THE ACTUATOR; A GREATER TORQUE LOAD CAN CAUSE DAMAGE TO THE MECHANISM.

9.        If sleeves move, replace the right- hand sync- lock.

10.    Move left-hand sync- lock lever to the locked position.

11.    Move right-hand sync- lock lever to the unlocked position.

12.    Repeat step 8 above.

13.    If sleeves move, replace the left-hand sync- lock.

14.    Move left-hand sync- lock lever to the unlocked position.

15.    Rotate actuator gearshaft to fully stow the sleeves.

16.    When translating sleeves reach stowed position, check that