AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CESSNA 400/112 and issues the following AD under subregulation 39.1 (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 400 Series Aeroplanes AD/CESSNA 400/112 Amdt 1 Fuel Boost Pump Wiring 11/2003 DM Applicability: Model 441 aeroplanes, serial numbers 0001 through 0362 and 0698. Requirement: 1. Inspect part number (P/N) 5718106-1 wire harnesses and fuel boost pump lead wires for chafing or damage in accordance with Cessna Conquest Service Bulletin (SB) CQB02-1 Revision 2, dated 7 October 2002. Note 1: Prior accomplishment of the first or initial Requirement 1 inspection in accordance with SB CQB02-1R1 Revision 1 dated 22 April 2002, as specified in the original issue of AD/CESSNA 400/111, is considered acceptable for the first or initial inspection required by this Directive. 2. If any wire harness P/N 5718106-1 is found chafed or damaged during the Requirement 1 inspections, replace the wire harness with wire harness P/N 5718106-6 in accordance with SB CQB02-1, Revision 2. 3. If any fuel boost pump lead wires are found chafed or damaged during the Requirement 1 inspections either repair and protect the fuel pump leads or replace the fuel boost pump in accordance with SB CQB02-1, Revision 2. 4. Install an improved design fuel boost pump (P/N 1C12-17 or an equivalent FAA approved P/N) or protect the fuel boost pump leads in accordance with SB CQB02-1, Revision 2 and install improved design wire harness P/N 5718106-6 in accordance with SB CQB02-1, Revision 2. Note 2: The FAA defines an improved design fuel boost pump as one that has the pump lead wires protected in accordance with SB CQB02-1, Revision 2. Note 3: Installing an improved design fuel pump and P/N 5718106-6 wire harness in both wing tanks terminates the Requirement 1 repetitive inspections of this Directive. 5. Only fuel boost pumps that have been inspected to ensure that the pump leads have been protected in accordance with SB CQB02-1, Revision 2 and improved design wire harnesses P/N 5718106-6 may be installed on any aeroplane as a replacement part. Note 4: FAA AD 2003-09-09 Amdt 39-13138 and FAA Alternate Method of Compliance Letter (FAA Small Airplane Directorate) dated 13 May 2003 refer. Compliance: For Requirement 1: 1. If not previously accomplished in accordance with AD/CESSNA 400/111 requirement 1 or AD/CESSNA 400/112 Requirement 1 - Within the next 25 hours time in service (TIS) after the effective date of this Directive and thereafter at intervals not exceeding 200 hours TIS until Requirement 3 is accomplished. b. If previously accomplished in accordance with AD/CESSNA 400/111 Requirement 1 or AD/CESSNA 400/112 Requirement 1 - Within the next 200 hours TIS after compliance with AD/CESSNA 400/111 Requirement 1 or AD/CESSNA 400/112 Requirement 1 and thereafter at intervals not exceeding 200 hours TIS until Requirement 3 is accomplished. For Requirements 2 and 3 - Before further flight after completing the Requirement 1 inspection. For Requirement 4 - Within the next 400 hours TIS after the effective date of this Directive. For Requirement 5 - As of the effective date of this Directive. This Amendment becomes effective on 10 September 2003. Background The United States Federal Aviation Administration (FAA) has received evidence of chafing and/or arcing of the electrical wiring leading to the fuel boost pump reservoir. Further investigation confirmed reports of chafing and/or arcing of the fuel boost pump wiring inside the fuel pump reservoir that supplies fuel to each engine. AD/CESSNA 400/111 required a one-time inspection of the fuel boost pump wiring inside and outside the boost pump reservoir, and the repair or replacement of the wiring as necessary. The original issue of this Directive, which superseded AD/CESSNA 400/111, required repetitive inspections until the new design wiring harness are installed and the boost pumps either modified or replaced. These actions were intended to detect and correct chafing and/or arcing of boost pump wiring, which could result in ignition of explosive vapour within the fuel storage system. This amendment clarifies what an improved design fuel pump is and requires pumps to be inspected before installation. This original issue of this Airworthiness Directive became effective on 10 July 2003. Jim Coyne Delegate of the Civil Aviation Safety Authority 3 September 2003 The above AD is notified in the Commonwealth of Australia Gazette on 10 September 2003.