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FAA adopts new airworthiness directives.

AIRLINE INDUSTRY INFORMATION-(C)1997-2001 M2 COMMUNICATIONS LTD

The US Federal Aviation Administration (FAA) has published in the Federal Register an amendment adopting an airworthiness directive (AD) that was sent previously to all known US owners and operators of Boeing 737-600, -700, -700C and -800 series aircraft. This AD requires inspection of the small jam nut on the elevator tab control rods to detect inspection putty and to determine its condition; a torque check of the small and large jam nuts on the tab control rod, if necessary; and corrective actions as applicable. For certain aircraft, this AD also requires a one time inspection for torque of the small and large jam nuts on the tab control rods and corrective actions if necessary. This AD is effective 18 June 2001.

An AD applicable to certain Boeing 737, 757, and 767 series aircraft has been adopted by the FAA. This AD requires repetitive operational checks of certain motor-operated hydraulic shutoff valves to detect malfunctioning, and replacement with new valves if necessary. It also requires eventual replacement of certain existing valves with new valves, which terminates the repetitive inspections, and is effective 16 July 2001.

An amendment superseding an existing AD applicable to certain Boeing 747-400, 757-200, 767-200 and 767-300 series aircraft has been adopted by the FAA. The existing AD requires repetitive checks to detect certain failures in the warning electronic unit (WEU) or modular avionic warning electronic assembly (MAWEA); repetitive tests to detect any failure of tactile, visual or aural alerts generated by the WEU or MAWEA; and corrective action if necessary. This amendment makes these requirements applicable to other aircraft on which the defective power supplies may be installed, eliminates the repetitive tests for certain aircraft and increases the interval for the repetitive tests for certain other aircraft. It also requires replacing any subject power supply in the WEU or MAWEA with a new, modified or serviceable power supply. This AD is effective 16 July 2001.

The FAA has also adopted an amendment superseding an existing AD applicable to certain Boeing 747-100 series aircraft. The current regulations require repetitive inspections to detect cracking of the outer chord of the body station 1480 upper and lower bulkhead and longeron splice fitting; repair, if necessary; and modification of the skin splice plate, the outer chord splice fitting and the stringer interface of the lower bulkhead, if necessary. This amendment revises the applicability of the existing AD to add additional aircraft, requires accomplishment of previously optional inspections and clarifies those inspections, extends certain compliance times and requires additional work in certain areas. It is also effective 16 July 2001.

Finally, the FAA has adopted a new AD that is applicable to certain Airbus A330 and A340 series aircraft, requiring repetitive inspections to detect discrepancies of the transfer tubes and the collar of the ball nut of the trimmable horizontal stabilizer actuator, and corrective action if necessary. This AD is effective 26 June 2001.

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Publication:Airline Industry Information
Geographic Code:1USA
Date:Jun 13, 2001
Words:503
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