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AD/JT8D/18 Amdt 2 - Second Stage Turbine Disc
Pratt and Whitney Turbine Engines - JT8DPratt and Whitney Turbine Engines - JT8D Series
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Pratt and Whitney Turbine Engines - JT8D Series
| AD/JT8D/18 Amdt 2 | Second Stage Turbine Disc | 7/2005 |
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| Applicability: | Pratt and Whitney Aircraft JT8D-15, -17, and -17R turbofan engines. |
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| Requirement: | To prevent possible failure of the second stage turbine disk, inspect second stage turbine disk, Part Numbers 676802, 770602, 780502, 786802, and 787302 details, and Part Numbers 676822, 769722, 769832, 786822, and 787232 assemblies for wear and cracking of the snap diameter and at the bottom of the disk air seal groove, repair the disk, and modify the mating third stage turbine inner air seal in accordance with the requirement of FAA Airworthiness Directive (AD) 85-19-51 R1.Note: FAA AD 85-19-51 R1 Amendment 39-5168 refers. |
| Compliance: | Unless previously accomplished, as per compliance schedule of the FAA AD85-19-51 R1. |
| This Amendment becomes effective on 7 July 2005. | |
| Background: | There have been reports of cracking of snap diameter and cracking at the bottom of the disk air seal groove for 2nd stage turbine disks. The inspection and repair requirements of this AD are aimed at prevention of 2nd stage turbine disk failure.The current amendment deletes reference to the manufacturer’s document and refers to the FAA AD as part of the harmonisation with the engine certificating Authority requirements.Amendment 1 of this Directive became effective on 26 December 1985. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
25 May 2005