AD 64-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 720 Series | BOEING Model 720 Series Aircraft |
| aircraft | The Boeing Company | 720B Series | BOEING Model 720 Series Aircraft |
Unsafe Condition
Failure of the second and third stage compressor rotor disc spacer assemblies (P/N 359411 and 359412) can cause serious engine damage and possible aircraft damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect spacer assemblies using an American Systoscope Markers Incorporated Model B-175-AS-15 or FAA approved equivalent. Reinspect within specified intervals (50 hours after effective date, then every 250 hours' time in service). Replace cracked spacers and remove engine before flight if cracks are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours' time in service after the effective date of this AD, and within each 250 hours' time in service thereafter (varies based on inspection history).
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Affected Aircraft
Boeing Model 720 Series and 720B Series aircraft with Pratt and Whitney JT3C-7 or JT3C-12 Turbojet Engines installed.
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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