Federal Aviation Administration April 12, 2006 – Federal Register Recent Federal Regulation Documents
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Airworthiness Directives; Short Brothers Model SD3 Airplanes
The FAA is revising an earlier NPRM for an airworthiness directive (AD) that applies to all Short Brothers Model SD3 airplanes. The original NPRM would have required installing additional fuel tank bonding jumpers, performing an in-place resistance check of the float switches, inspecting certain internal components of the fuel tanks, and performing related corrective actions if necessary. The original NPRM would have also required revisions to the Airworthiness Limitations section of the Instructions for Continued Airworthiness, and to the airplane flight manual procedures for operation during icing conditions and fuel system failures. The original NPRM resulted from fuel system reviews conducted by the manufacturer. This action revises the original NPRM by adding service information. We are proposing this supplemental NPRM to prevent ignition sources inside the fuel tanks, which could lead to fire or explosion.
Airworthiness Directives; Boeing Model 747-200C and -200F Series Airplanes
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 747-200C and -200F series airplanes. That AD currently requires repetitive inspections to find fatigue cracking in the upper chord of the upper deck floor beams, and repair if necessary. For certain airplanes, the existing AD also provides an optional repair/modification, which extends certain repetitive inspection intervals. This new AD reduces the compliance time for all initial inspections and reduces the repetitive interval for a certain inspection. This AD results from new reports of cracks in the upper deck floor beams occurring at lower flight cycles. We are issuing this AD to find and fix cracking in certain upper deck floor beams. Such cracking could extend and sever floor beams at a floor panel attachment hole location and could result in rapid decompression and loss of controllability of the airplane.
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