AD 79-11-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Airplanes |
Unsafe Condition
The auto-speedbrake system may not function properly at outside air temperatures below 25 degrees F, potentially causing the takeoff warning system to malfunction.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Deactivate the auto-speedbrake system by pulling and collaring circuit breakers and placarding handles inoperative for Group I airplanes. Advise flight crews of potential takeoff warning system malfunction for all affected groups. Perform a one-time check and adjustment of throttle lever auto-speedbrake/takeoff warning switches within 1,000 hours time-in-service or 6 months, whichever comes first.
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Compliance Time
Within 50 hours time-in-service after the effective date, and within 1,000 hours time-in-service or 6 months after the effective date, whichever comes first.
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Affected Aircraft
Boeing Model 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, and specific serial numbers listed in Groups I, II, and III as detailed in the source.
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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