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 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. Pratt and Whitney Turbine Engines - JT9D Series AD/JT9D/39 One-Piece Fan Case Shield 4/2004 Applicability: Pratt & Whitney (PW) JT9D-7R4D, -7R4D1, -7R4E, -7R4E1, -7R4E4, - 7R4G2, and -7R4H1 turbofan engines with steel fan cases. Note 1: These engines are installed on, but not limited to, Airbus Industrie A300 and A310, and Boeing 747 and 767 aeroplanes. Requirement: 1. For PW JT9D-7R4D, -7R4D1, -7R4E, -7R4E1, -7R4E4, and -7R4H1 turbofan engines with steel fan cases that have PW Service Bulletin (SB) 72-312 incorporated, replace fan case shield Part Number (P/N) 802095 with the four- piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in PW SB JT9D-7R4- 72-583. 2. For PW JT9D-7R4G2 turbofan engines with steel fan cases that have PW SB 72- 88 and PW SB 72-311 incorporated, replace fan case shield P/N 802094 with the four-piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in Part A of PW SB JT9D-7R4-72-584. 3. For PW JT9D-7R4G2 turbofan engines with steel fan cases that do not have PW SB 72-88 incorporated, but have PW SB 72-311 incorporated, replace fan case shield P/N 802094 with the four-piece fan case shield and install four fan case shield supports. Information on replacing fan case shields and installing fan case shield supports can be found in Part B of PW SB JT9D-7R4-72-584. Note 2: FAA AD 2004-01-08 Amdt 39-13422 refers. Compliance: Unless previously accomplished, at the next shop visit but no later than 31 December 2012. For the purpose of this Directive, a shop visit is defined as separation of the B-flange during in-shop maintenance. Separation of the B-flange in order to replace fan case assemblies for rub strip repairs is not considered a shop visit. This Airworthiness Directive becomes effective on 15 April 2004. Pratt and Whitney Turbine Engines - JT9D Series AD/JT9D/39 (continued) Background: This Directive requires on JT9D-7R4 series turbofan engines with steel fan cases, replacement of the existing one-piece fan case shield with a thicker four-piece fan case shield that will add four fan case shield supports. This Directive is in response to two uncontained full fan blade fracture events that resulted in penetration of the steel fan case and fan case shield. The actions detailed in this Directive are to prevent uncontained fan blade failures, resulting in damage to the aeroplane. James Coyne Delegate of the Civil Aviation Safety Authority 4 March 2004 The above AD is notified in the Commonwealth of Australia Gazette on 24 March 2004.