AD 62-14-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Model JT3D-1, JT3D-1-MC6, JT3D-1-MC7 and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Model JT3D-1, JT3D-1-MC6, JT3D-1-MC7 and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Model JT3D-1, JT3D-1-MC6, JT3D-1-MC7 and JT3D-3 Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Model JT3D-1, JT3D-1-MC6, JT3D-1-MC7 and JT3D-3 Engines |
Unsafe Condition
Fourth stage turbine rotor blade failures due to insufficient tip shroud lock angle and improper blade root serration rework on P/N 395304 Change H or earlier and P/N 434104 Change C or earlier blades.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Rework blades to incorporate a 55 degree tip shroud lock angle per P&WA telegraphic message dated August 17, 1961. Rework first serration of blade root and trailing edge per Service Bulletin No. 387 and March 15, 1962 telegraphic message, including fluorescent penetrant inspections before and after. Stress relieve blades at 1500°F±25°F for 4 hours and glass bead peen per AMS-2430.
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Compliance Time
at first engine overhaul after the effective date of this AD unless already accomplished
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Affected Aircraft
Pratt & Whitney JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 engines equipped with fourth stage turbine rotor blades P/N 395304 Change H or earlier or P/N 434104 Change C or earlier
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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