AD/B737/130 Amdt 2 - Rudder PCU - Displacement Tests (Cth)

AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B737/130 Amdt 1 and issues the following AD under subregulation 39.001(1) of CASR 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/B737/130 Amdt 2 Rudder PCU - Displacement Tests 10/2005

Applicability: All Model B737 series aircraft. Requirement: 1. Perform a displacement test on the secondary slide in the dual servo valve in the rudder PCU in accordance with Boeing Alert Service Bulletin 737-27A1221 Revision 1 dated January 28, 1999 (Model 737-100, -200, -300, -400 and -500 series) or in accordance with Boeing Alert Service Bulletin 737-27A1222, Revision 1, dated January 28, 1999 (Model 737-600, -700 and -800 series).

2. Subject to the test in Requirement 1 proving negative (valve fails test), replace the valve assembly in accordance with Boeing Alert Service Bulletin 737-27A1221 Revision 1 dated January 28, 1999 (Model 737-100, -200, -300, -400 and -500 series) or in accordance with Boeing Alert Service Bulletin 737-27A1222, Revision 1, dated January 28, 1999 (Model 737-600, -700 and -800 series), and repeat test.

3. Do not install on any aircraft any main rudder PCU having P/N 65-44861-12 and serial number 3509A or lower or, any PCU having P/N 65C37053-(XX) (Model 737-100, -200, -300, -400 and -500 series) or PCU having P/N 251A301-(XX) and serial number 0299 or lower (Model 737-600, -700 and -800 series) unless the PCU nameplate has been vibro-engraved with the letter "C" following the serial number.