Airworthiness of Boeing Model 747-400 AMEND

AMENDMENT 396831 (BOEING 747400):

This research assesses, from a public policy perspective, Amendment 396831 to the Airworthiness Directive for Boeing Model 747400 Series Airplanes, issued under Part 39, 14 CFR. The effective date of the Amendment was 26 December 1990.

Objective and Essence of Amendment 396831

The manufacturer of the Model 747400 airplanes observed that, when some versions of Integrated Display Systems software were installed in Model 747400 airplanes, the aural and master systems of the fire detection system on the aircraft becomes inoperative. Left uncorrected, this condition could result in a situation wherein a fire in the airplane's auxiliary power unit, engines, wheel well, or cargo compartment would not be annunciated to the air crew.

The manufacturer developed proposed corrective actions to be effected by the operators of Model 747400 airplanes, and to be incorporated into the Model 747400 airplanes which have yet to be delivered by the manufacturer to purchasers. The manufacturer issued these proposed corrective actions in a Boeing Alert Service Bulletin on 4 October 1990. The manufacturer further submitted the proposed corrective actions to the Federal Aviation Agency (FAA), together with a recommendation that the proposed corrective actions be issued as an amendment to the airworthiness directive pertaining to Model 747400 Series Airplanes

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ne's auxiliary power unit, engines, wheel well, or cargo compartment. Second, the FAA found that the occurrence of such an undetected fire would pose a threat to flight safety. Based upon these two findings, the FAA determine that a need to act existed with respect to the identified problem area. Clearly, a fire on an aircraft poses a threat to flight safety. An undetected fire poses an even greater threat. The aircraft manufacturer notified the FAA of the problem; therefore, there was no dissent with respect to the culpability of the aural and master systems of the fire detection system. The FAA investigation did determine that other systems on board the Model 747400 Series Airplanes might notify air crews of fires undetected by faulty aural and master systems of the aircraft fire detection system. In this context, however, the FAA determined further that any such secondary detection of such fires could result in a delayed reaction time by air crews, and that such delay would pose a threat to flight safety. The FAA, thus, was correct in its determination of a need to act with respect to the identified problem area. Applicability to Multiple Aircraft The manufacturer's notification to the FAA of the problem involvin
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Approximate Word count = 1647
Approximate Pages = 7 (250 words per page)