AD 75-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707 and 720 Series Airplanes |
Unsafe Condition
Cracks in the outer surface of the horizontal stabilizer center section rear spar upper chord assembly terminal lugs, initiating in the bushed holes at the terminal fittings.
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Required Actions
Visually inspect the horizontal stabilizer center section upper rear spar for cracks in the terminal lugs every 225 hours time in service, with an initial inspection due within 100 hours after the effective date if not done within the last 125 hours. If cracks are found, replace the assembly or repair by installing a strap per Boeing Drawing No. 65C15785 (replaceable after 3,000 hours) or modify per Boeing Service Bulletin No. 3243.
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Compliance Time
Within 100 hours time in service after the effective date, unless inspected within the last 125 hours time in service, and every 225 hours thereafter.
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Affected Aircraft
Boeing Model 707 and 720 series airplanes delivered after January 28, 1966 (including Serial Numbers 18955 and 18979), modified by Boeing Service Bulletin No. 2243 (Revisions 1-7), or had bushings removed for lug bore inspection/corrosion removal, with specified time-in-service thresholds.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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