AD 86-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 737 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 737 Series Airplanes |
Unsafe Condition
Cracking in the horizontal stabilizer center section rear spar upper chord attach lugs.
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Required Actions
Eddy current inspect the horizontal stabilizer center section rear spar upper chord attach lug for cracks in accordance with Boeing Service Bulletin 737-55-1033. If cracks are found, replace the horizontal stabilizer center section rear spar upper chord. Repeat inspections at intervals not exceeding 5,700 landings.
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Compliance Time
Prior to the accumulation of 40,000 landings; or prior to the accumulation of 40,000 landings after a chord replacement or modification in accordance with Boeing Service Bulletin 737-55-1033, Option I; or within 200 landings after the effective date of this AD; whichever occurs latest, unless accomplished within the last 5,500 landings.
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Affected Aircraft
Boeing Model 737 series airplanes listed in Boeing Service Bulletin 737-55-1033, dated April 12, 1985, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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