AD 2002-23-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McDonnell Douglas | MD-11 and -11F | Airworthiness Directives; McDonnell Douglas Model MD-11 and -11F Airplanes Equipped with Collins LRA-900 Radio Altimeters |
Unsafe Condition
A fault in Collins LRA-900 radio altimeters having a certain part number could result in an incorrect and unbounded output of radio altitude to other airplanes, leading to an undetected anomalous radio altitude signal passed to the flare control law of the flight control computer, which could cause the airplane to flare too high or too low during landing, and consequently result in a hard landing.
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Required Actions
Revise the Limitations Section of the FAA-approved Airplane Flight Manual to prohibit autopilot coupled autoland operations below 100 feet above ground level (AGL). Alternatively, replace both Collins LRA-900 radio altimeters having part number 822-0334-220 with Collins LRA-700 radio altimeters having part number 622-4542-221. Perform a one-time general visual inspection to determine the part number of the radio altimeter receiver/transmitters.
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Compliance Time
Within 90 days after the effective date of this AD.
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Affected Aircraft
McDonnell Douglas Model MD-11 and -11F airplanes equipped with certain Collins LRA-900 radio altimeters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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