AD 78-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707-300/400/300B/300C Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707-300/400/300B/300C Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707-300/400/300B/300C Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707-300/400/300B/300C Series Airplanes |
Unsafe Condition
Cracks between terminal fittings in the horizontal stabilizer center section rear spar upper chord.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the horizontal stabilizer center section rear spar upper chord for cracks between terminal fittings using methods specified in Boeing Service Bulletin 3331 or paragraph B. If cracks are found, rework using an FAA-approved repair provided by Boeing or an approved method, or replace the chord with the same part number before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 375 landings after the effective date of this AD and thereafter at intervals not to exceed 375 landings.
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Affected Aircraft
Boeing Model 707-300/400/300B/300C series airplanes upon the accumulation of, or with more than 8,000 landings.
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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