AD 78-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737-100/200/200C/T43A Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737-100/200/200C/T43A Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737-100/200/200C/T43A Series Airplanes |
Unsafe Condition
Loose attach bolts of the horizontal stabilizer hinge outboard fittings could result in failure of the horizontal stabilizer attachment, leading to loss of control.
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Required Actions
Inspect all attach bolts (16 per side) of the horizontal stabilizer hinge outboard fittings for looseness. Tighten loose bolts to 65-80 in.-lbs. or replace bolts per Boeing Service Bulletin No. 737-53-1048. Repeat inspections every 3,000 flight hours time-in-service.
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Compliance Time
Within the next 75 flight hours time-in-service after January 16, 1978, unless accomplished within the last 3,000 flight hours time-in-service.
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Affected Aircraft
Boeing Model 737-100/200/200C/T43A series airplanes listed in Boeing Service Bulletin No. 737-53-1048 that have not had the bolt replacement per figure 1 of that service bulletin.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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