AD/B737/109 Amdt 2 - Flying Control Power Control Unit Cylinder Bore Replacement (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B737/109 Amdt 1 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.

Boeing 737 Series Aeroplanes

AD/B737/109 Amdt 2

Flying Control Power Control Unit Cylinder Bore Replacement

11/2002

TX

Applicability: Model 737-100, -200, -300, -400, and -500 series aeroplanes, having a main rudder power control unit (PCU) part number P/N 65-44861-( ), P/N 65C37052- ( ) or P/N 65C37053-( ), except those having a serial number of 1252A or greater or having a serial number that contains "ss", or an aileron or elevator PCU having P/N 65-44761-( ), except those having a serial number of 5360A or greater or having a serial number that contains "ss".

Requirement: 1. Perform an inspection of the applicable PCU to determine if repaired or reworked PCU manifold cylinder bores containing chrome plating are installed, in accordance with Boeing Service Letter 737-SL-27-30 dated April 1, 1985.

2. Any PCUs identified with chrome plated manifold cylinder bores are to have the bores replaced in accordance with Boeing Service Letter 737-SL-27-30 dated April 1, 1985.

Note 1: FAA AD 2000-02-18 Amendment 39-11536 refers and supersedes FAA AD 97-09-14 Amendment 39-10010.