AD 78-26-07
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
Thrust reverser assemblies with specific part numbers (P/N 65-27800-29 through 65-27800-59) and actuator/track assemblies (P/N 65-37920-28, -30, -32, or -34) may fail, leading to potential uncommanded reverse thrust deployment or inadequate reverse thrust capability.
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Required Actions
Install a placard stating 'Idle Reverse Only' above the EPR indicator for each engine position with the specified thrust reverser assemblies, except those inspected and reworked per Boeing SB 727-78-A86 or equivalent. Affected operators must obtain documents from Boeing or FAA Northwest Region if not already received.
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Compliance Time
Within ten (10) days from the effective date of this AD
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Affected Aircraft
Boeing Model 727 Series airplanes equipped with operative thrust reverser assemblies P/N 65-27800-29 through 65-27800-59 and actuator/track assemblies P/N 65-37920-28, -30, -32, or -34.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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