AD 75-09-04 R1
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 rear spar center section fitting at the upper or lower flanges or hinge lugs beyond allowable limits could result in structural failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the horizontal stabilizer rear spar center section fitting within 750 flight hours after the AD's effective date (January 22, 1985) unless done within the last 2250 flight hours. Repeat inspections at intervals not exceeding 3000 flight hours until replaced. Stop drill cracks within allowable limits before further flight, repair hinge lugs as specified, or replace with a new improved fitting if cracks exceed limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 750 flight hours after the effective date of this AD, unless accomplished within the last 2250 flight hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 727 series airplanes listed in Boeing Service Bulletin 727-55-62, including 727-100, 727-100C, 727-200, 727-200F, 727 Series, and 727C Series models, with serial numbers 1 through 641 inclusive.
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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