Airworthiness directives › 98-24-51
AD 98-24-51 Airworthiness Directives; McDonnell Douglas Model MD-11 Series Airplanes Equipped with Certain Collins LRA-900 Radio Altimeters
Models named: MD-11 series. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model MD-11 series airplanes, equipped with certain Collins LRA-900 radio altimeters, having part number 822- 0334-002, 822-0334-020, or 822-0334-220; certificated in any category.
Compliance
Required as indicated, unless accomplished previously. To detect and correct an undetected anomalous radio altitude signal that is passed along 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, accomplish the following: (a) Within 24 hours after the effective date of this AD, accomplish either paragraph (a)(1) or (a)(2) of this AD: (1) Revise the Limitations Section of the FAA-approved Airplane Flight Manual to include the following statement: ``Autopilot coupled autoland operations below 100 feet above ground level (AGL) are prohibited.'' (2) For airplanes on which the LRA-700 radio altimeter installation has been approved in accordance with Type Certificate or Supplemental Type Certificate procedures: Replace both Collins LRA-900 radio altimeters having part number 822-0334-002, 822-0334- 020, or 822-0334-220, with Collins LRA-700 radio altimeters having part number 622-4542-221. (b) As of the effective date of this AD, no person shall install on any airplane a Collins LRA-900 radio altimeter, having part number 822-0334-002, 822-0334-020, or 822-0334-220. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. Note: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (e) This amendment becomes effective on December 7, 1998, to all persons except those persons to whom it was made immediately effective by telegraphic AD T98-24-51, issued on November 19, 1998, which contained the requirements of this amendment. Issued in Renton, Washington, on November 25, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-32100 Filed 12-1-98; 8:45 am] BILLING CODE 4910-13-U
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1