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FAA issues new airworthiness directives.

AIRLINE INDUSTRY INFORMATION-(C)1997-2000 M2 COMMUNICATIONS LTD

The US Federal Aviation Administration (FAA) has proposed the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-400 and 767 series aircraft. This AD would require modification of the core cowl assemblies of the engine and is necessary to prevent failure of the core cowl latches during an engine fire and associated effects. Comments are due by 19 January 2001.

The FAA has adopted an amendment that supersedes an existing AD applicable to certain Airbus Model A319, A320 and A321 series aircraft. The current AD requires repetitive inspections to detect wear of the inboard flap trunnions and wear or debonding of the protective half-shells, and corrective actions if necessary. The amendment requires accomplishment of the previously optional terminating action and is effective 8 January 2001. Also applicable on this date and to the above Airbus Model aircraft is a new AD that requires revision of the Airplane Flight Manual, inspection to detect damage of the wiring and adjacent structure along the length of the fairing of the fuel boost pump, and corrective actions if necessary. The AD also requires modification of the fuel pump wire and fairing.

The FAA has adopted a new AD applicable to certain Airbus Model A300 B2 and B4 series aircraft and Model A300-600 series aircraft. This AD requires repetitive inspections to detect chafing and the existence of repairs of the harness of the high-level sensor of the fuel surge tanks, and to detect chafe marks on the support canisters of the magnetic level indicators, and follow-on corrective actions if necessary. It also requires modification of the harness for the high-level sensor of the outer wing fuel tanks, which terminates certain repetitive inspections.

A new AD applicable to all Boeing Model 737-300, -400 and -500 series aircraft has been adopted that requires replacement of the existing autothrottle computer with a new, improved autothrottle computer.

Applicable to all Boeing Model 707 and 720 series aircraft is a new AD that requires repetitive inspections of certain stringers and around certain fastener holes of the lower skin of the wings to detect fatigue cracking, and repair if necessary.

The above three ADs are all effective 8 January 2001.

Also effective on 8 January 2001 is an AD that is applicable to certain Boeing Model 747 series aircraft. This AD requires inspections to detect cracking of the frame web, doubler and inner chord of the forward edge frame of main entry door number 1, and various follow-on actions.

The FAA has proposed the supersedure of an existing AD that is applicable to all British Aerospace (Jetstream) Model 4101 aircraft. The existing AD requires repetitive inspections to detect loose or migrated levers of the elevator cable tension regulators, and replacement of the regulator assembly with a new assembly if necessary. This amendment would require modification of the elevator cable tension regulator lever assembly, terminating the repetitive inspections. Comments are due by 4 January 2001.

Finally, the FAA has proposed the adoption of an AD that is applicable to certain Airbus Model A330 and A340 series aircraft. This AD would require identification of the part and serial numbers of the pressure reducing valve on each air pressurisation unit; the testing of pressure reducing valves and air pressurisation units with affected serials numbers, and the replacement of faulty valves or units with new parts. Comments must be received by 4 January 2001.

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Publication:Airline Industry Information
Date:Dec 6, 2000
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