AD 99-04-23
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 737-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737-100, -200, and -300 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-100, -200, and -300 Series Airplanes |
Unsafe Condition
Broken bolts that attach the terminal support fittings to the upper part of the Body Station 1088 bulkhead could result in reduced structural integrity of the vertical fin installation and possible loss of the vertical fin.
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Required Actions
Perform an ultrasonic inspection within 18 months after the effective date. Repeat inspections every 18 months if no broken bolts are found. If broken bolts are found, remove H-11 steel alloy bolts, perform eddy current inspections, oversize bolt holes, install new Inconel bolts, or repair corrosion/cracking as specified.
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Compliance Time
Within 18 months after the effective date of this AD, and repeat inspections at intervals not to exceed 18 months. For removal and replacement: prior to the accumulation of 20 years since date of manufacture or within 18 months after the effective date, whichever occurs later.
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Affected Aircraft
Boeing Model 737-100, -200, and -300 series airplanes, line numbers 1 through 1485 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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