AD 78-01-08
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
Failure of the automatic throttles due to improper actuation of thrust lever operated switches S197, S784, S553, and S555 below -65 degrees F could result in loss of thrust control.
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Required Actions
Set thrust lever operated switches S197, S784, S553, and S555 to provide actuation down to and including -65 degrees F per Boeing Service Bulletin 727-31-30 or equivalent. Submit proposed modifications for non-Boeing automatic throttles to the FAA Northwest Region.
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Compliance Time
Within 2000 hours time in service after the effective date of this AD
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Affected Aircraft
Boeing Model 727 series airplanes with autospeed brake system or auto wheel brakes with JT8D-17R engines and automatic throttle clutches, except those with EPR activated takeoff warning system.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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