Federal Aviation Administration June 29, 2005 – Federal Register Recent Federal Regulation Documents
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Airworthiness Directives; Boeing Model 747 and 767 Airplanes
The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 747 and 767 airplanes. This proposed AD would require reworking the electrical bonding between the airplane structure and the pump housing of the outboard boost pumps in the main fuel tank of certain Boeing Model 747 airplanes, and between the airplane structure and the pump housing of the override/jettison pumps in the left and right wing center auxiliary fuel tanks of certain Boeing Model 767 airplanes. This proposed AD would also require related investigative actions and corrective actions if necessary. This proposed AD is prompted by the results of fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent insufficient electrical bonding, which could result in a potential of ignition sources inside the fuel tanks, and which, in combination with flammable fuel vapors, could result in fuel tank explosions and consequent loss of the airplane.
Airworthiness Directives; Airbus Model A330 and A340 Series Airplanes
The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Model A330 and A340 series airplanes. This proposed AD would require repetitive borescope inspections of the left and right fuel tanks of the trimmable horizontal stabilizers (trim tanks) for detached or damaged float valves; related investigative/corrective actions if necessary; and the eventual replacement of all float valves in the left and right trim tanks with new, improved float valves, which terminates the need for the repetitive inspections. This proposed AD would also require repetitive replacement of certain new, improved float valves. This proposed AD is prompted by reports of detached and damaged float valves in the trim tanks. We are proposing this AD to prevent, in the event of a lightning strike to the horizontal stabilizer, sparking of metal parts and debris from detached and damaged float valves, or a buildup of static electricity, which could result in ignition of fuel vapors and consequent fire or explosion.
Airworthiness Directives; Fokker Model F27 Mark 200, 400, 500, and 600 Airplanes
The FAA proposes to adopt a new airworthiness directive (AD) for certain Fokker Model F27 Mark 200, 400, 500, and 600 airplanes. This proposed AD would require a general visual inspection of the rotary knobs for the fuel tank isolation valves to determine if the seal wire has been installed correctly and corrective actions if necessary. This proposed AD is prompted by investigation of a recent accident, which found that the rotary knobs controlling the fuel tank isolating valves had been in the shut position. We are proposing this AD to ensure that the rotary knobs are not inadvertently moved to the shut position, which could result in fuel starvation to both engines and consequent inability to maintain controlled flight and landing.
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