AD 2019-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives: The Boeing Company Airplanes |
Unsafe Condition
uncommanded fore and aft movement of the Captain's and First Officer's seats during a critical phase of flight, such as takeoff or landing, that could cause a flight control obstruction or unintended flight control input, which could result in the loss of the ability to control the airplane.
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Required Actions
repetitive horizontal actuator identifications, repetitive checks of the HMS, a detailed inspection of the HMS for certain airplanes, and applicable on-condition actions, an inspection to determine the part number and, if applicable, the serial number of the Captain's and First Officer's seats, and applicable on-condition actions, the installation of a serviceable Captain's or First Officer's seat as specified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-25-3653, Revision 1, dated October 19, 2018, or the option to install a power-deactivated seat as specified in the appropriate airplane maintenance manual (AMM) procedure (AMM procedure 25-11-01-01), in lieu of the terminating action or until the horizontal actuator can be serviced in accordance with the appropriate service information.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747-8F, and 747-8 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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