AD 85-19-51 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Model JT8D-15, -17, and -17R Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Model JT8D-15, -17, and -17R Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY AIRCRAFT Model JT8D-15, -17, and -17R Engines |
Unsafe Condition
Failure of the second stage turbine disk due to wear and cracking of the snap diameter and at the bottom of the disk airseal groove.
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Required Actions
Inspect second stage turbine disks with specified part numbers for wear and cracking, repair the disk, modify the mating third stage turbine inner airseal per PWA SB 5541, Rev 1, and PWA SB 5510, Rev 1, or FAA-approved equivalents. Disks exceeding repair limits must be removed from service.
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Compliance Time
Compliance schedule varies: For unrepaired disks, inspect by 14,000 hours time in service since new or within next 2,000 hours, whichever is later; or if over 14,000 hours, by 17,000 hours or within next 2,000 hours, whichever comes first. For repaired disks, inspect within next 400 hours if over 2,000 hours since repair, or by 2,000 hours since repair or within next 400 hours, whichever is later.
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-15, -17, and -17R engines with second stage turbine disks having Part Numbers 676802, 770602, 780502, 786802, 787302 (details) and 676822, 769722, 769832, 786822, 787232 (assemblies).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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