Document ID: chunk:federal_register_of_legislation:F2006B03171:body:0:p1
Version: federal_register_of_legislation:F2006B03171
Segment Type: other
Provision Reference: 
Character Range: 3–3193

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (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.

 Boeing 747 Series Aeroplanes

 AD/B747/275 Thrust Reverser Inspections, Modifications and
                                Tests

 7/2002

           Applicability: Model 747 series aeroplanes powered by General Electric CF6-45 or –50 series engines.

                 Requirement: 1. (a) Carry out the applicable detailed visual inspections and tests of the thrust reverser stow/deploy switches, bullnose seals and airmotor brake on each engine, in accordance with Work Package 1 of the Accomplishment Instructions of Boeing Alert Service Bulletin (ASB)747-78A2160, Revision 1, dated 12 April, 2001; OR

                 (b) Install a thrust reverser actuation system (TRAS) lock on each thrust reverser half of each engine, in accordance with Boeing Service Bulletin (SB) 747- 78-2150, Revision 1, dated 2 July, 1998. All of the modifications described in the Service Bulletins listed in paragraphs I.K.1.h. and I.K.1.j. of Boeing SB 747-78-2150, Revision 1, must be accomplished, as applicable, in accordance with those Service Bulletins, prior to, or concurrently with, the accomplishment of the installation of the TRAS lock.

              2.        Repeat applicable detailed visual inspections and tests required by Requirement 1(a).

              3.        Carry out a functional test of the TRAS lock on each thrust reverser half, in accordance with the appropriate approved maintenance data.

4.        (a) Repeat functional test if no discrepancy detected while carrying out Requirement 3.

(b)     Repair in accordance with the procedures specified in the appropriate approved maintenance data if any discrepancy is detected while carrying out Requirement 3; AND

(c)      Repeat Requirement 3.

              5.        Carry out the applicable detailed visual inspections and tests of the overpressure shutoff valve electrical connectors, flexible shafts, directional pilot valve and the micro switch pack for each engine, in accordance with Work Package II of the Accomplishment Instructions of Boeing Alert Service Bulletin 747-78A2160, Revision 1, dated 12 April, 2001.

              6.        Repeat applicable detailed visual inspections and tests required by Requirement 5.

7.        (a) If any of the inspections and tests required by Requirement 1(a) and 5 of this AD cannot be successfully performed, or if any discrepancy is detected during the inspections and tests, repair in accordance with Boeing ASB 747- 78A2160, Revision 1, dated 12 April, 2001; OR

(b)     Operate the aeroplane in