AD 88-11-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | Airworthiness Directives; BOEING Model 737 Series Airplanes |
Unsafe Condition
Cracks in the forward side of the wing front spar upper chord structure from FSS 90 to FSS 225, which could lead to structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 100 flight hours after the effective date, visually inspect for cracks in the specified spar area. Repeat inspections every 1,000 flight hours. Apply corrosion inhibitor after each inspection. Stop drill or repair cracks based on length; repair must be done before further flight for cracks ≥2 inches. Install improved upper chord segments as terminating action if replaced.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 flight hours after the effective date of this AD, unless previously accomplished within the last 900 flight hours.
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Affected Aircraft
Boeing Model 737 series airplanes listed in Boeing Alert Service Bulletin 737-57A1081, Revision 10, dated July 16, 1987.
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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