USAir Flight 1493
|This article needs additional citations for verification. (February 2013)|
Diagram showing movement of the aircraft involved in the accident.
|Date||February 1, 1991|
|Summary||Runway collision caused by ATC error and negligence|
|Site||Los Angeles International Airport
Los Angeles, California
|Total injuries (non-fatal)||30|
An USAir Boeing 737-3B7, similar to the one involved
|Flight origin||Syracuse Hancock Int'l Airport|
|1st stopover||Washington National Airport|
|2nd stopover||Port Columbus Int'l Airport|
|Last stopover||Los Angeles Int'l Airport|
|Destination||San Francisco Int'l Airport|
|Injuries (non-fatal)||13 serious, 17 minor|
A SkyWest Airlines Fairchild Metroliner, similar to the one involved
|Type||Fairchild Swearingen Metroliner|
|Flight origin||Los Angeles Int'l Airport|
|Destination||LA/Palmdale Regional Airport|
USAir Flight 1493 was a scheduled United States (US) domestic passenger flight from Syracuse Hancock International Airport, New York, to San Francisco International Airport, California, via Washington, D.C., Columbus, Ohio, and Los Angeles, California. In the evening of Friday, February 1, 1991, the aircraft serving the flight accidentally collided with SkyWest Flight 5569 upon landing at Los Angeles.
That evening saw slow to moderate air traffic at Los Angeles airport (LAX), but as the USAir 737 was on final approach, a series of abnormalities distracted the local controller, including an aircraft that inadvertently switched off the tower frequency and a misplaced flight progress strip which resulted in the SkyWest Metroliner being told to taxi into takeoff position while the USAir flight was landing on the same runway without the Metroliner ever being given a takeoff clearance.
Upon landing, the 737 collided with the twin-engine turboprop, continued down the runway with the turboprop crushed beneath it, exited the runway, and caught fire. Twenty-two of 89 people aboard the 737 and all 12 aboard the Metroliner died. Rescue workers were on the scene of the fire within minutes and began the evacuation of the plane. Because of the intense fire, three of the 737's six exits could not be used. Neither of the front exits were usable, which caused the front passengers to try to use the overwing exits. However, only one of the overwing exits was usable, which caused a backlog to form. Most of those aboard the 737 who died in the accident did so from asphyxiation in the post-crash fire.
The National Transportation Safety Board (NTSB) found the probable cause of the accident to be procedures in use at the LAX control tower which provided inadequate redundancy, leading to a loss of situational awareness by the local controller. The crash led directly to the NTSB's recommendation of using different runways for takeoffs and landings at LAX.
USAir flight 1493 was a scheduled service from Syracuse, making stops at Washington, D.C., Columbus, Ohio, and Los Angeles (LAX), before continuing to San Francisco. On February 1, 1991, after a crew change in Washington, it was under the command of Captain Colin Shaw, 48, and First Officer David Kelly, 32. Flying into LAX, the aircraft carried 83 passengers and a crew of six.
LAX consisted of four parallel runways, with the two runways and associated taxiways north of the terminal called the North Complex. Aircraft that landed on the outer runway – 24R – would cross the inboard runway – 24L – in order to reach the terminal.
SkyWest Airlines Flight 5569, a twin-engine Fairchild Metroliner bound for Palmdale, California, with 10 passengers and two crew members on board, was cleared by an Air Traffic Controller in the LAX tower (the 'local controller') to taxi to Runway 24L, moving from gate 32 to the runway via taxiways Kilo, 48, Tango, and 45 (names have been re-designated Charlie, Quebec, Delta, and Delta10 since 1991). The plane was briefly not visible from the tower on taxiway 48 between Kilo and Tango in the area known as no man's land.
Immediately prior to SkyWest 5569 reaching runway 24L, a Wings West aircraft had landed on 24R and was awaiting permission to cross 24L and taxi to the terminal. The local controller attempted to cross the Wings West aircraft but the crew had changed frequencies and did not answer, distracting the local controller as she attempted to reestablish communications. Shortly after 6 PM local time, as USAir 1493 was making its final approach to LAX, SkyWest 5569 was cleared by the local controller to taxi into its takeoff position on 24L at the intersection of taxiway 45, some 2,200 feet (670 m) up from the runway threshold. After four attempts by the local controller, the Wings West aircraft finally responded to the tower and apologized for switching frequencies. The local controller then cleared US1493 to land on 24L, with SkyWest 5569 still holding in takeoff position on the runway.
With this activity ongoing, another Wings West aircraft, a Metroliner similar to SkyWest 5569, called the tower reporting they were ready for takeoff. The same local controller queried this aircraft about their position, and they told her they were holding on a taxiway short of 24L. The flight progress strip for this flight had not yet been given to the local controller by the clearance delivery controller (another distraction), and the local controller mistakenly thought this taxiway Metroliner was SkyWest 5569 and thus the runway was clear of aircraft. The first officer of USAir 1493 recalled hearing this conversation, but did not remember anyone being cleared to hold on the runway.
USAir 1493 touched down near the runway threshold and as the nose was being lowered, the first officer noticed SkyWest 5569 on the runway and applied maximum braking. USAir 1493 shortly thereafter slammed into Skywest 5569 and both aircraft skidded down the runway with the Metroliner crushed beneath the 737's fuselage. The aircraft veered off the left side of the runway and the wreckage came to rest on the far side of the taxiway against a closed fire station building where it caught fire. Large debris from the Metroliner – including its tail, wings, and right engine – were found on the runway and between the runway and the abandoned fire station.
The accident was witnessed from a plane carrying the Vancouver Canucks, who were arriving for a NHL hockey game against the Los Angeles Kings. The captain of that charter aircraft, having just landed, powered up the engines to get away from the fireball of the accident. The team was unsure if the USAir 737 was going to stop before it collided with their plane. The Canucks were shaken by the experience and lost to the Kings by a score of 9–1, their worst loss of the 1990–91 season.
Fatalities and injuries
The 34 dead included all 12 people (10 passengers and 2 crew – Captain Andrew J. Lucas and First Officer Frank C. Prentice III) on SkyWest 5569 and 22 of the 89 aboard the USAir 1493 (20 passengers and 2 crew members – Captain Collin Shaw and Flight Attendant Deanna Bethea-Kearney). Captain Shaw was killed when the nose of the aircraft struck the abandoned fire station, crushing the section of the cockpit where his seat was located. Of the remaining passengers and crew aboard USAir 1493, two crew members and 11 passengers sustained serious injuries, 2 crew members and 15 passengers sustained minor injuries and 37 passengers received no injuries. Billionaire businessman David H. Koch was among the survivors.
The majority of fatalities aboard USAir 1493 occurred to those seated in the front of the plane, where the post crash fire originated in the forward cargo hold, fed by a combination of fuel from the wreckage of SkyWest 5569 and gaseous oxygen from the 737's damaged crew oxygen system. Everyone seated in row 6 or forward was either killed or sustained major injuries, while everyone aft of row 17 escaped, some with minor injuries. Only 2 passengers and one crew member managed to escape from the forward service (R1) door, while the main cabin (L1) door was inoperable due to damage. Only two passengers used the left over-wing exit before the fire became too intense outside the aircraft. The majority of the survivors exited via the right over-wing exit, with the rest of the surviving cabin occupants escaping through the rear service (R2) door. The rear passenger (L2) door was briefly opened during the course of the accident, but was quickly closed due to the spreading fire on that side of the aircraft. Multiple issues slowed the evacuation from the right over-wing door, including a passenger seated in the exit row who could not open the door, a brief scuffle between two men at the exit, and the seat back of the exit window seat being folded forward, partially obstructing the exit.
From the location of the bodies, only two victims on USAir 1493 were found in their seats, while authorities believe that 17 had unbuckled their seat belts and died from smoke inhalation while making their way to the exits. According to James Burnett, who headed the National Transportation Safety Board (NTSB) investigation team, "I can't think of a recent accident where this many people have been up and out of their seats and didn't make it out." The captain was one of the few people who died of blunt force trauma, a blow to the head when the bulkhead collapsed as the aircraft collided with the firehouse. The first officer was rescued through the cockpit windows by some of the first fire fighters to arrive on the accident scene.
One person who evacuated USAir 1493 died from thermal burns a few days after the accident. One of the 13 seriously injured passengers succumbed to multiple traumatic injuries 31 days after the crash – not listed as a USAir 1493 fatality due to language in the Code of Federal Regulations (49CFR830.2) that defines a fatality as taking place within 30 days of the accident.
Among the dead on SkyWest 5569 were Skywest's Palmdale station manager as well as an FAA Air Traffic controller who worked in Palmdale.
The first officer, who was flying the USAir 1493 during the accident leg, reported that he did not see SkyWest 5569 until he lowered the nose of his aircraft onto the runway after landing. He also said that he applied the brakes, but did not have enough time for evasive action. Statements made by passengers who survived the crash were consistent with this testimony.
The local controller, Robin Lee Wascher (38), who cleared both aircraft to use the same runway testified before the NTSB and accepted blame for causing the crash. She said she originally thought the landing USAir plane had been hit by a bomb, then "realized something went wrong... I went to the supervisor and I said, 'I think this (the SkyWest plane) is what USAir hit.'" She testified that rooftop lights in her line of sight caused glare in the tower, making it difficult to see small planes at the intersection where the SkyWest plane was positioned. Just before the accident, she confused the Skywest plane with another commuter airliner that was on a taxiway near the end of the runway. Making matters more difficult, the ground radar at LAX was not working on the day of the accident.
The NTSB's investigation of the crash revealed that the cockpit crew of the landing USAir jet could not see the commuter plane, which blended in with other airport lights. The NTSB cited LAX's procedures which placed much of the responsibility for runways on the local controllers, which directly led to the loss of situational awareness by the local controller. The NTSB also noted that during the previous performance review a supervisor had noted four deficiencies in the local controller who ultimately worked the accident aircraft. These deficiencies were not addressed prior to the accident, and two of the deficiencies were apparent in the accident sequence—her loss of situational awareness and aircraft misidentification.
The NTSB's investigation of the crash revealed a failing system in the air and ground traffic control facilities at LAX: the ground radar system worked intermittently, and was not functioning at the time of the incident; the blind spot, from the control tower, when looking at the spot where SkyWest 5569 was waiting on the runway; the system for ground controllers in the tower to pass flight progress strips to the local controller did not support the local controller's workload; aircraft on runways were not required to turn on all their external lights until rolling for takeoff. All these issues were rectified at LAX following this incident.
At the time of the accident, air traffic controllers at LAX used all four runways (North Complex runways 24L and 24R, South Complex runways 25L and 25R) for mixed takeoffs and landings. One of the NTSB recommendations was that the runways be segregated with only landings or departures taking place on an individual runway. This recommendation was implemented, but not until after another incident, when on 19 Aug 2004 a Boeing 747 landing on 24L passed only 200 feet (61 m) above a 737 holding on the same runway. LAX now uses the outboard runways (24R and 25L) for landings and the inboard runways (24L and 25R) for departures.
Before this accident, the Federal Aviation Administration (FAA) issued a ruling that required airlines to upgrade the flammability standards of materials on board, but the USAir plane had been built before the effective date of those requirements and had not yet been modernized. It was scheduled to be upgraded within the next year. By 2009, all aircraft operating in the United States were compliant.
- Linate Airport disaster
- Madrid runway disaster
- Tenerife Airport disaster
- Lists of accidents and incidents on commercial airliners
- "NTSB Report AAR91-08"
- Kilroy, Chris. AirDisaster.Com: Special Report: USAir Flight 1493. Retrieved on 2009-12-16.
- Mike Beamish (December 9, 2006). "Flights, fate and football: Remembering Flight 180". Canadian Football League.
- Steve Springer (February 4, 1991). "Canucks Had Close-Up View of Fatal Airline Crash at LAX". Los Angeles Times.
- klein, Dan. "Cockpit voice recorder of USAir 1493". Retrieved 17 July 2013.
- "The Fire This Time." people.com, 25 February 1991. Retrieved on 2009-12-16.
- "LAX Runway Collision". Retrieved on 2009-12-16.
- "United in Death"
- Malnic, Eric and Connell, Rich. "Controller Says Her Error Caused Runway Collision." latimes.com, 8 May 1991. Retrieved on 2009-12-17.
- Carroll, James. "FAA releases tower tapes of crash on L.A. runway". Baltimore Sun, 26 March 1991. Retrieved on 2009-12-16.
- NTSB report LAX04IA302
- "Surviving Crashes: How Airlines Prepare for the Worst." time.com, 26 February 2009. Retrieved on 2009-12-16.