AD 85-01-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 737 Series Airplane |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 737 Series Airplane |
Unsafe Condition
Cracking of the body buttock line (BBL) 70.85 rib upper chord which may lead to failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the BBL 70.85 rib upper chord and repair angles for cracks in accordance with Boeing Service Bulletin 737-57-1087, Revision 4. Repeat inspections at intervals not exceeding 5000 landings. Replace or repair cracked parts and reinspect parts repaired with 'stop drilling' interim action at intervals not exceeding 1500 landings within two years. Incorporate Preventative Modification Part III or Special Modification Part IV to terminate AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the accumulation of 10,000 landings or within 180 days or 2500 flight cycles after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 737 series airplanes certificated in all categories listed in Boeing Service Bulletin 737-57-1087, Revision 4.
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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