AD Amdt-39-10512
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | MD-11 | Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes |
Unsafe Condition
Incorrect multiplexers installed in the flight management computer system (FMC's) during production caused simultaneous failure of certain data busses during a ground test, leading to potential loss of airspeed and altitude indications on both primary flight displays and loss or degradation of autopilot functionality.
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Required Actions
Revise the Airplane Flight Manual to require both flight management computers (FMCs) to be installed and operational. Inspect FMCs to determine their serial numbers and perform follow-on corrective actions if necessary.
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Compliance Time
Before further flight
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Affected Aircraft
McDonnell Douglas Model MD-11 series airplanes with incorrect multiplexers installed in the FMC system during production.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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