N635AW

1.1 HISTORY OF FLIGHT

On August 28, 2002, at 1844 mountain standard time, an Airbus Industrie A320-231, N635AW, operating as America West Airlines flight number 794, landed on runway 08 at the Phoenix Sky Harbor International Airport, Phoenix, Arizona. While decelerating about midfield, the airplane veered right and exited off the side of the runway. Thereafter, the airplane crossed the apron area east of intersection B8 and experienced the separation of its nose gear strut assembly upon traversing the dirt infield area south of the runway, where it slid to a stop on its nose. The airplane was substantially damaged. On board the airplane there were 2 flight crewmembers, 3 flight attendants, and 154 passengers (including 4 lap children), for a total of 159 occupants. Of the 10 persons injured, 1 of the crewmembers (the captain) sustained a minor injury, 7 passengers and 1 lap child sustained minor injuries, and 1 passenger was seriously injured. The daytime flight was performed under the provisions of 14 CFR Part 121. Visual meteorological conditions prevailed. The 2 hour 41 minute flight departed from Houston, Texas, at 1803 central daylight time.

Days earlier, the airplane's #1 thrust reverser had been rendered inoperative (MEL'd). The #1 thrust reverser system had been mechanically locked out by maintenance personnel thereby precluding its usage.

The captain of the accident airplane reported to National Transportation Safety Board investigators he had been informed by the captain of the preceding flight, following its arrival in Houston, that the #1 thrust reverser was inoperative and had been MEL'd.

At 1840, while approaching Phoenix during the accident flight, a Federal Aviation Administration (FAA) air traffic local controller issued the airplane (call sign Cactus 794) a clearance to land on runway 08. The crew acknowledged the clearance and continued their straight-in visual approach to the runway.

FAA recorded radar data indicates that the airplane descended at an approximate 3-degree descent angle from at least 7 miles west of the airport until arriving in the vicinity of the runway threshold.

The airplane's captain indicated to the Safety Board's Operations Group Chairman that he was the pilot flying (handling the flight controls). The captain indicated that the airplane's touchdown and his derotation on the runway's centerline was normal. The touchdown occurred about 1,200 feet beyond the threshold, and he initially maintained directional control of the airplane.

At 1843:40, the air traffic controller stated to the crew of Cactus 794, "I appreciate the first right turn you can make then a left turn on Bravo and contact ground."

In the captain's written statement he reported, in part, that after retarding both thrust levers to the idle position, he engaged the #2 (right side) thrust reverser. Shortly thereafter, the airplane started slowly diverging to the right. The captain reported that he reached down to ensure that the #1 (left side) thrust lever was in idle, and he reduced thrust on #2 while feeding in left rudder steering. The airplane did not respond to the steering input, so he added more pressure to the left brake, which did not correct the airplane's course. The airplane exited off the right side of the runway, and the nose wheel dropped into a ditch. (See the "Airplane Information" section of this report and the "Safety Board Operations Group Chairman's Factual Report" for a description of thrust reverser operation and procedures.)

The air traffic controller observed the airplane veer off the runway and traverse the infield. The controller stated to the flight crew, at 1844:35, "there doesn't appear to be any fire coming out of your wings." At 1845:00, the controller said, "ah theres we see no fire or smoke coming out the vehicles are on their way out right now." The crew responded and stated, at 1845:04, "we're going to evacuate the aircraft."

1.2 INJURIES TO PERSONS

Fire department personnel reported having evaluated 150 occupants. Five of the occupants were transported to medical facilities; the others were treated locally, as needed. The injuries generally consisted of head, neck, shoulder, and back trauma.

1.3 DAMAGE TO AIRPLANE

In pertinent part, the external examination of the airplane revealed lateral skin panel buckling on the sides of the airplane from the aft nosecone area near frame #1, through frame #12, located about 9.5 feet aft. The bottom surface of the airplane's nose was crushed upward a maximum of 12 inches.

Regarding interior structure in the vicinity of the nose gear wheel well, the forward pressure bulkhead was found bent and cracked. The rear pressure bulkhead was bent.

1.4 PERSONNEL INFORMATION, FLIGHT CREW

The accident occurred on the second day of the flight crew's scheduled 3-day flight sequence, which began on August 27 with a flight from Phoenix, Arizona, to San Diego, California, to Phoenix, and then to Houston, Texas. On August 28, the flight to Phoenix blocked out of the gate about 1744 central daylight time.

1.4.1 The Captain.

The captain, age 59, held an airline transport pilot certificate, with an airplane single and multiengine land and rotorcraft helicopter ratings. He held type ratings in the Airbus A320 and the DHC-8. He possessed a first-class aviation medical certificate with the limitation that he must have available glasses for near vision.

A review of the captain's FAA records indicated that he had no history of prior accidents, incidents, or enforcement actions. The captain's total flight time was reported at 19,500 hours, of which 7,000 hours were as captain flying an A320. During the preceding 24 hours, 30, and 90 days the captain had flown for 4, 76, and 232 hours, respectively. The captain's last A320 proficiency check was accomplished in July 2002.

The captain reported that following his arrival in Houston on August 27, he had a 15-hour layover. He stated that he had sufficient sleep in Houston. On August 28, he had lunch with his first officer prior to reporting for duty.

1.4.2 The First Officer.

The first officer, age 40, held an airline transport pilot certificate, with airplane single and multiengine land ratings. He held type ratings in the B-737, BA3100, and SF-340. He possessed a first-class aviation medical certificate with the limitation that he must wear corrective lenses.

A review of the first officer's FAA records indicated that he had no history of prior accidents, incidents, or enforcement actions. His total flight time was reported at over 11,000 hours, of which 800 hours were acquired flying an A320. During the preceding 24 hours, 30, and 90 days the first officer had flown for 4, 53, and 173 hours, respectively. The first officer's last A320 proficiency check was accomplished in February 2002.

The first officer reported that following his arrival in Houston on August 27, he likewise had a 15-hour layover. He stated that he had sufficient sleep in Houston. He stated that his rest the night before was adequate, sleep was sufficient and normal, and his fatigue level was insignificant.

1.5 AIRCRAFT INFORMATION

1.5.1 Maintenance, General.

The airplane, serial number 092, was manufactured in 1990. America West Airlines maintained the airplane on a continuous airworthiness basis following the Airbus maintenance inspection program. The program was reviewed for accomplishment of the prescribed Through-Flight Checks, 4- and 8-Day Checks, A & C Checks, and for compliance with airworthiness directives. According to the FAA participant, the program audit revealed that America West Airlines had followed the approved maintenance program. The last "C" check and "A" checks were accomplished as scheduled on September 27, 2001, and on July 22, 2002, respectively. By the accident date, the airplane had 40,084 total hours and 18,530 cycles.

1.5.2 Landing Gear.

The airplane's nose and main landing gear overhaul records indicated that all three gears were last overhauled in October 1999. All three gears were installed on the accident airplane in November 1999. All three gears have 18,262 cycles since new and 3,863 cycles since the last overhaul. No sub-components of the nose landing gear assembly have been replaced since installation.

1.5.3 Thrust Reverser Operation and Service History.

The "Landing" section of the America West Airlines "Flight Crew Operations Manual" (FCOM) states the following: "After main gear touchdown, immediately raise the reverse thrust levers to the full reverse position and adjust reverse thrust as necessary. The "Powerplant Controls and Indicators" section of the FCOM provides a description of the airplane's reverser latching levers and thrust levers. In part, the manual indicates that a thrust lever is placed into the reverse position by first pulling up the reverser latching lever that is located on the front of the thrust lever. Thereafter, the thrust lever may be retarded in an aft direction thereby placing it into the reverse thrust position. (See the Safety Board Operations Group Chairman's Factual Report, Attachment 9, for drawings and additional information.)

The thrust reverser systems for the two engines function independently of each other. Pursuant to America West Airlines procedures, N635AW could be dispatched with an inoperative (MEL'd) thrust reverser.

On August 17, 2002, the #1 thrust reverser failed to deploy on landing in Phoenix. The system was repaired, operationally checked, and was found serviceable. Later on August 17, the #1 thrust reverser failed to deploy again. Maintenance personnel deactivated the reverser and deferred maintenance pursuant to MEL 78-30-01. On August 18, the #1 thrust reverser underwent maintenance. It was satisfactorily operationally checked, and the MEL placard was removed.

On August 20, the #1 thrust reverser did not deploy. It was deactivate...