AD 78-11-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Series Airplanes |
Unsafe Condition
Cracks in the horizontal stabilizer jackscrew gimbal support fittings, P/N 65-17435-3 and -4, could result in structural failure of the horizontal stabilizer assembly.
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Required Actions
Inspect the horizontal stabilizer jackscrew gimbal support fittings for cracks using eddy current or low frequency eddy current methods per Boeing Alert Service Bulletin 727-55-A73 or approved procedures. Repeat inspections at intervals of either 1,500 flight hours or 9 months, or 3,000 flight hours or 18 months if reworked. Replace or repair cracked parts before further flight. Terminate with replacement of fittings with 7075-T73 aluminum alloy P/N 65-17435-5/-6.
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Compliance Time
Within the next 750 flight hours time-in-service after the effective date of this AD or prior to November 15, 1978, whichever occurs first, unless accomplished within the last 750 flight hours time-in-service or since January 15, 1978.
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Affected Aircraft
Boeing Model 727 series airplanes with horizontal stabilizer jackscrew gimbal support fittings P/N 65-17435-3 and -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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