Accident Fairchild SA227-AC Metro III N683AV,

ASN Wikibase Occurrence # 325858

Date:	Friday 1 February 1991
Time:	18:07
Type:	Fairchild SA227-AC Metro III
Owner/operator:	SkyWest Airlines
Registration:	N683AV
MSN:	AC-683
Year of manufacture:	1987
Engine model:	Garrett TPE331
Fatalities:	Fatalities: 12 / Occupants: 12
Other fatalities:	22
Aircraft damage:	Destroyed, written off
Category:	Accident
Location:	Los Angeles International Airport, CA (LAX) - United States of America
Phase:	Take off
Nature:	Passenger - Scheduled
Departure airport:	Los Angeles International Airport, CA (LAX/KLAX)
Destination airport:	Palmdale Airport, CA (PMD/KPMD)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
USAir Flight 1493 left Columbus at 13:17 for a flight to Los Angeles. The Boeing 737-300, N388US, aircraft entered LAX airspace around 17:57 and was cleared for a CIVET Two Profile Descent and ILS runway 24R approach. At 17:59 this was changed to a runway 24L approach clearance.
At about the same time a SkyWest Metro III aircraft (Flight 5569 to Palmdale) taxied out from Terminal 6, Gate 32 to runway 24L. At 18:03 the crew were advised to "taxi up to and hold short of 24L" because of other traffic. At 18:04:49 the flight was cleared to taxi into position and hold. Immediately thereafter the controller became preoccupied with instructing WingsWest Flight 5006 who had unintentionally departed the tower frequency. The WingsWest 5072 reporting ready for takeoff caused some confusion because the controller didn't have a flight progress strip in front of her. The strip appeared to have been misfiled at the clearance delivery position. Meanwhile, Flight 5569 was still on the runway at the intersection with taxiway 45, awaiting takeoff clearance.
At 18:07 Flight 1493 touched down. Simultaneous to the nosegear touchdown, the Boeing 737 collided with the SkyWest Metro. Both aircraft caught fire and slid to the left into an unoccupied fire station.

PROBABLE CAUSE: "The failure of the Los Angeles Air Traffic Facility Management to implement procedures that provided redundancy comparable to the requirements contained in the National Operational Position Standards and the failure of the FAA ATS to provide adequate policy direction and oversight to its ATC facility managers. These failures created an environment in the Los Angeles ATC tower that ultimately led to the failure of the Local Controller 2 (LC2) to maintain awareness of the traffic situation, culminating in the inappropriate clearances and the subsequent collision of the USAir and SkyWest aircraft. Contributing to the cause pf the accident was the failure of the FAA to provide effective quality assurance pf the ATC system."

Accident investigation: