AD Amdt-39-10929

final rule
Data completeness: 70%

Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes Equipped with Certain Collins LRA-900 Radio Altimeters

AD Number
Amdt-39-10929
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. 98-NM-334-AD
FR Citation
63 FR 66422

Applicability

TypeManufacturerModelDetails
aircraft McDonnell Douglas MD-11 Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes Equipped with Certain Collins LRA-900 Radio Altimeters

Unsafe Condition

A fault in certain Collins LRA-900 radio altimeters could result in an incorrect and unbounded output of radio altitude to other airplane systems.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Revise the Airplane Flight Manual to prohibit autopilot coupled autoland operations in certain conditions. Alternatively, replace certain Collins LRA-900 radio altimeters with Collins LRA-700 radio altimeters.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

McDonnell Douglas Model MD-11 series airplanes equipped with certain Collins LRA-900 radio altimeters.

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for McDonnell Douglas MD-11

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