AD/CESSNA 750/2 Amdt 1 - Chafing of APU Fuel Tube Assembly (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/CESSNA 750/2 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.

Cessna 750 (Citation X) Series Aeroplanes AD/CESSNA 750/2 Amdt 1 Chafing of APU Fuel Tube Assembly 3/2007

Applicability: Cessna Model 750 Aircraft, Serial Numbers -0001 through -0256 inclusive. Requirement: 1. Perform a detailed inspection to verify the clearance and detect chafing of one of the Auxiliary Power Unit (APU) fuel tube assemblies in the tail cone area of the airplane due to the interference between the APU fuel tube and elevator flight control cables, hydraulic lines, and high temperature bleed air couplings as per provisions of Cessna Alert Service Letter (ASL) ASL750-49-09 Revision 2, dated 10 March 2005 or later FAA approved revisions.

2. If chafing is detected, carry out corrective action per ASL750-49-09 Revision 2 or later FAA approved revisions.

3. For airplanes having serial numbers -0001 through -0031 inclusive and -0033 through -0107 inclusive, replace the APU fuel tube in the tail cone area of the airplane with a new fuel tube Part Number 6756605-23, in accordance with Cessna Service Bulletin (SB) 750-49-05 Revision 1, dated 17 January 2000 or later FAA approved revision.