United Airlines says it has completed the "majority" of inspections on its 96 Boeing 757s as of Feb. 16, following discovery of a maintenance lapse that led to 15 canceled flights. It expects to run normal operations and does not foresee further disruptions, says spokesman Mike Trevino.
The airline determined Feb. 15 that it needed to perform the inspections, since a modification it carried out on the 757s' air data computers requires further checks per a June 2004 airworthiness directive (AD 2004-10-05, archived at http://www.airweb.faa.gov/Regulatory_and_Guidance_Library.
The AD, which applies to Boeing Model 747-400, 747-400D, 747-400F, 757-200, 757-200PF, 757-200CB, 767-200, 767-300, and 767-300F series aircraft, requires installing certain new circuit breakers, relays and related components and making various wiring changes in and between the flight deck and main equipment center in accordance with Boeing Service Bulletin 757-34A0222, Revision 1, dated July 17, 2003.
Trevino did not have a timeline for completing the inspections, which take up to 90 min. per aircraft.