AD 76-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY AIRCRAFT Model JT8D-9, -11, -15 and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Model JT8D-9, -11, -15 and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Model JT8D-9, -11, -15 and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-9 | PRATT & WHITNEY AIRCRAFT Model JT8D-9, -11, -15 and -17 Engines |
Unsafe Condition
Liberation of second stage fan blades due to loss of head on blade pin rivet (P/N 520457) or missing bushing (P/N 520458).
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Required Actions
Inspect blade pin rivet P/N 520457 for loss of head or missing bushing P/N 520458 per P&WA Service Bulletin 4577 or equivalent method. Replace with pin P/N 758242 and rivet P/N 760187 or FAA parts by January 1, 1979.
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Compliance Time
Before the accumulation of 1200 hours time in service since new blade pin rivets were installed or within the next 300 hours time in service after the effective date of this AD, whichever is later. Thereafter, inspections must occur at intervals not exceeding 600 hours time in service since the last inspection. Replacement must be completed prior to January 1, 1979.
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-9, -11, -15, and -17 engines containing second stage fan blade pin P/N 520456, rivet P/N 520457, and bushing P/N 520458.
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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