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AD/APU/18 - Fuel Leaks on Hamilton Sundstrand APU Models T-62T-46C12 and T-62T-40C14
Auxiliary Power UnitsAuxiliary Power Units
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Auxiliary Power Units
| AD/APU/18 | Fuel Leaks on Hamilton Sundstrand APU Models T-62T-46C12 and T-62T-40C14 | 3/2005 |
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| Applicability: | Hamilton Sundstrand Power Systems Models T-62T-46C12 and T-62T-40C14 (APS 500R) auxiliary power units (APUs) with fuel filter housing assemblies, part numbers (P/Ns) 4951627, 4951960, or 4952039 installed.Note 1: These APUs are installed on, but not limited to, Bombardier DHC-8-400 airplanes and Empresa Brasileira de Aeronautica S.A. (EMBRAER) EMB-135 and-145 series aircraft. |
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| Requirement: | APU Model T-62T-46C12Install a bracket onto the fuel filter housing assembly on APU Model T-62T-46C12 as per provisions of Hamilton Sundstrand Alert Service Bulletin (ASB) No. ASB-4503067-49-9 dated 2 December 2003.APU Model T-62T-40C14 (APS 500R)Unless previously installed, install a bracket onto the fuel filter housing assembly on APU Model T-62T-40C14 (APS 500R) as per provisions of Hamilton Sundstrand ASB- 4504112-49-22 Revision 2 dated 4 October 2004.For brackets previously installed using Original Issue of the ASB-4504112-49-22, dated 2 December 2003, perform a one-time inspection for proper gap and if necessary, adjust the gap between the bracket and bypass button. Use paragraph 2.B. and 2.D. (1) of the Accomplishment Instructions of ASB-4504112-49-22 Revision 2 dated 4 October 2004 to inspect and adjust the gap.Note 2: For APU Model T-62T-40C14 (APS 500R), installation of a part number fuel filter assembly that is not listed in this AD constitutes optional terminating action to the requirements of this AD.Note 3: FAA Airworthiness Directive 2004-24-03 Amendment 39-13879 refers. |
| Compliance: | Unless accomplished earlier, within 500 hours time-in-service or 6 months after the effective date of this AD, whichever occurs earlier. |
| This Airworthiness Directive becomes effective on 17 March 2005. |
| Background: | There have been reports of failed / cracked fuel bypass button on the fuel filter housing, protruding beyond internal o-ring seal and causing fuel leak.This AD addresses the identified unsafe condition caused by leaking fuel and resultant fire or explosion. |
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James Coyne
Delegate of the Civil Aviation Safety Authority