Following is summary of the last radio exchanges of Alaska Airlines Flight 261, as described by John Hammerschmidt of the National Transportation Safety Board. These are not direct quotes from pilots and controllers, but are based on what the NTSB called a rough transcript. Times are Pacific Standard.
3:55 p.m.
Last routine transmission before problems are reported. Los Angeles ATC (air traffic control center located in Palmdale, Calif.) clears Flight 261 to head for San Francisco at 31,000 feet.
4:10 p.m.
Flight 261 advises it is having control difficulties and descends to 26,000 feet.
Seconds later
Flight 261 reports it is at 23,700 feet. Discussion about pilots having trouble controlling the plane.
10 second later
ATC asks Flight 261 what altitude it wants to maintain.
4:11 p.m.
ATC asks Flight 261 its condition. Flight 261 advises it is "kind of stabilized," in Hammerschmidt's words, and is going to do some troubleshooting. Flight 261 asks for clearance to fly between 20,000 and 25,000 feet. ATC gives clearance.
4:14 p.m.
ATC asks if Flight 261 needs anything. Flight 261 responds that pilots are still working on the problem.
Seconds later
Discussion between air traffic controllers about handing off control of plane from one sector to the next.
4:15 p.m.
ATC traffic control hands off to a new controller who was aware of its problems.
Seconds later
Flight 261 advises it has a jammed stabilizer and difficulty maintaining altitude. Pilots think they can maintain altitude and land at Los Angeles International Airport.
4:16 p.m.
Flight 261 cleared to land at LAX. ATC asks if flight needs a lower altitude. Flight 261 says it needs to get to 10,000 feet and change configuration -- set the wing flaps to slow the plane down -- while over water. ATC issues clearance to 17,000 feet. Flight 261 says OK and advises it needs a block of altitudes. Last known transmission of Flight 261.
4:17 p.m.
ATC advises Flight 261 to contact another sector on a different frequency. Transmission not acknowledged.
4:21 p.m.
Flight 261 is lost off radar.
Source: Associated Press