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AD/PW4000/16 - Front Pylon Mount Bolts
Pratt and Whitney Turbine Engines - PW40Pratt and Whitney Turbine Engines - PW4000 Series
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Pratt and Whitney Turbine Engines - PW4000 Series
| AD/PW4000/16 | Front Pylon Mount Bolts | 18/2010 |
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| Applicability: | Pratt & Whitney (PW) PW4164, PW4168, and PW4168A series turbofan engines, with front pylon mount bolts, part number (P/N) 54T670 or 51U615, installed. These engines are installed on, but not limited to, Airbus A330 series airplanes. |
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| Requirement: | Unless previously accomplished, perform the initial torque checks and inspections in accordance with the technical requirements of FAA AD 2006-16-05 Amendment39-14705.Repeat the torque checks and inspections in accordance with the technical requirements of FAA AD 2006-16-05 Amendment 39-14705.Replacement of the forward engine mount bearing housing, P/N 59T794 or P/N 54T659 with P/N 52U420, using SB PW4G-100-71-22, dated 15 January 2002, or later FAA approved revision, constitutes terminating action to the inspection requirements of paragraph (h) of the requirement document, FAA AD 2006-16-05 Amendment 39-14705.Later revisions to PW ASB PW4G-100-A71-9, Revision 1, dated 24 November 1997, PW ASB PW4G-100-A71-18, Revision 2, dated 15 January 2002, and PW ASB PW4G-100-A71-32, dated 15 April 2005, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2006-16-05 Amendment 39-14705, are considered acceptable for compliance with the equivalent Requirements of this AD. |
| Compliance: | As specified in the Requirement Document with a revised effective date of13 September 2010. |
| This Airworthiness Directive becomes effective on 13 September 2010. |
| Background: | This AD results from analysis by the manufacturer that MP159 material pylon bolts do not meet the full life cycle torque check interval requirement, in a bolt-out condition. This AD is issued to prevent front pylon mount bolt and primary mount thrust load path failure, which could result in an engine separating from the airplane. |
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Charles Lenarcic
Delegate of the Civil Aviation Safety Authority
9 September 2010