Serious incident Boeing 737-890 N516AS, Wednesday 24 December 2008
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Date:Wednesday 24 December 2008
Time:07:00 LT
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different    
Boeing 737-890
Owner/operator:Alaska Airlines
Registration: N516AS
MSN: 39044/2751
Year of manufacture:2008
Engine model:CFM 56-7B27/3
Fatalities:Fatalities: 0 / Occupants: 141
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:Seattle/Tacoma International Airport, WA (SEA/KSEA) -   United States of America
Phase: Pushback / towing
Nature:Passenger - Scheduled
Departure airport:Seattle/Tacoma International Airport, WA (SEA/KSEA)
Destination airport:Hollywood Burbank Airport, CA (BUR/KBUR)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Airline personnel reported that the airplane pushed back from the gate with the auxiliary power unit running. As the push back sequence was completed, two deicing vehicles began deicing operations prior to the flight crew configuring the airplane for deicing. Shortly after, the cabin and flight crew noticed fumes within the cabin and cockpit area. The flight crew instructed the deice crew to discontinue deicing operations and the flight crew performed the smoke removal checklist as the deicing operation stopped. The flight crew started both engines and taxied back to gate N14 where the passengers and flight crew exited the airplane via the jet way. The captain reported that he did not clear the ground deicing crew to start their deicing operations. The driver of the primary deicing vehicle reported that he informed the flight crew of the fluid types, freeze points, and concentrations. He added that there was a lot of "radio chatter" and the bucket operator began deicing operations "after we received no objections" from the flight crew. Company deicing procedures state, in part, "prior to fluid application, Ground Deicing Crew member shall confirm with Flight Crew that the aircraft is configured for deicing." The flight crew gate deicing checklist states that the APU and engine bleed air switches are to be turned off prior to deicing. At the time, the APU and engine bleed air switches were still in the ON position when deicing fluid was sprayed on the airplane. This allowed the fluid to be introduced into the air supply lines leading to the cabin and cockpit.

Probable Cause: The failure of the deicing crew to follow company procedures by not receiving confirmation from the flight crew before beginning to deice the airplane.

Accident investigation:
Investigating agency: NTSB
Report number: WPR09IA065
Status: Investigation completed
Duration: 11 months
Download report: Final report


FAA register: 2. FAA:

History of this aircraft

Other occurrences involving this aircraft

20 August 2023 N516AS Alaska Airlines 0 Santa Ana-John Wayne International Airport (SNA/KSNA), Santa Ana, CA sub
Gear collapse


Revision history:

27-Dec-2008 23:55 FISA Added
20-Jul-2016 15:16 Dr.John Smith Updated [Registration, Cn, Location, Departure airport, Destination airport, Source, Damage]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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