MD82 / MD11, Anchorage AK USA, 2002

Summary: 

On 17 March 2002, at Ted Stevens Anchorage Airport, a McDonnell Douglas MD82 operated by Alaska Airlines, on a night pushback in snow conditions collided with an inbound taxiing McDonnell Douglas MD-11. The MD82 suffered substantial rudder damage although the impacting MD11 winglet was undamaged.

Event Details
When: 
17/03/2002
Event Type: 
Day/Night: 
Night
Flight Conditions: 
On Ground - Low Visibility

18896

Flight Details
Operator: 
Type of Flight: 
Public Transport (Passenger)
Flight Origin: 
Intended Destination: 
Take-off Commenced: 
No
Flight Airborne: 
No
Flight Completed: 
No
Phase of Flight: 
Pushback/towing

18897

Flight Details
Operator: 
Type of Flight: 
Public Transport (Cargo)
Intended Destination: 
Take-off Commenced: 
Yes
Flight Airborne: 
Yes
Flight Completed: 
No
Phase of Flight: 
Taxi
Location
Location - Airport
Airport: 
General
Tag(s): 
Aircraft-aircraft collision
HF
Tag(s): 
Distraction, Flight Crew / Ground Crew Co-operation, Ineffective Monitoring, Spatial Disorientation
GND
Tag(s): 
Taxiway collision, Aircraft / Aircraft conflict, Surface Friction, Aircraft Push Back, Wingtip clearance, Accepted ATC clearance not followed
Outcome
Damage or injury: 
No
Aircraft damage: 
Major
Non-aircraft damage: 
No
Non-occupant Casualties: 
No
Off Airport Landing: 
No
Ditching: 
No
Causal Factor Group(s)
Group(s): 
Aircraft Operation, Airport Operation
Safety Recommendation(s)
Group(s): 
None Made
Investigation Type
Type: 
Independent

Description

On 17 March 2002, at Ted Stevens Anchorage Airport, a McDonnell Douglas MD82 operated by Alaska Airlines, on a night pushback in snow conditions collided with an inbound taxiing McDonnell Douglas MD-11. The MD82 suffered substantial rudder damage although the impacting MD11 winglet was undamaged.

Synopsis

The following is an extract from the official Report (ANC02FA023A) on the Accident investigation carried by National Transportation Safety Board (USA) (NTSB):

[…] "as the MD-82 was being pushed back from the gate area, and while the MD-11 was taxiing to parking. The MD-11 was not damaged. There was heavy snowfall with reduced visibility at the time of the accident, and the airport ramp around the gate area had an estimated 8 inches of loose snow. The captain of the MD-82 reported that prior to pushback from the gate, he was advised by the ATCT [air traffic control tower] ground controller to "remain clear of taxiway Kilo during pushback from the gate." The captain informed the tug driver of the ground controller's instructions, and the tug driver acknowledged receipt of the instructions. Taxiway Kilo is adjacent to, and south of, the airport ramp area utilized by the MD-82 operator. As the pushback proceeded, the tug driver noticed the MD-11 moving westbound on Taxiway Kilo, behind the tail of the MD-82, and he stopped the pushback. A ground-marshaling attendant stationed on the east side of the MD-82's wing (right wing), proceeded to the rear of the airplane to ensure adequate clearance between the tail of the MD-82, and the right wing of the MD-11. The tug driver said that he observed the ground-marshaling attendant on his left, closest to the tail of the MD-82, using his (red) flashlight wand, to signal him to move the parked MD-82 away from Taxiway Kilo, towards the gate. The tug driver said that just after observing the ground-marshaling attendant's visual instructions, the taxiing MD-11's right wing struck the tail of the parked MD-82. The captain of the MD-11 stated that while taxiing slowly westbound on Taxiway Kilo, with the recessed green taxiway centerline lights easily visible through the accumulation of snow, he kept the nose wheel over the centerline of the taxiway. As his airplane approached the tail of the stopped MD-82, the relief captain, seated in the right seat, along with an additional (non-flying) first officer, stood up from their seats to attempt to visually assess the clearance between the MD-11's right wingtip and the MD-82's tail. The MD-11 captain added that there was a heavy accumulation of snow covering the right side window, which limited the relief captain's and first officer's views. He said at that point, the MD-11 crew turned their attention to the MD-82's ground handling staff who were outfitted with lighted (red) flashlight wands. The captain reported that he did not see a stop or emergency signal from any of the ground-marshaling attendants. Subsequently, the right winglet of the taxiing MD-11 collided with the upper portion of the MD-82's rudder assembly."

Causal and Contributory Factors

The NTSB determines the probable cause(s) of this accident as follows:

"The failure of the flight crew of the other airplane (MD-11) to maintain clearance while taxiing and the MD-82 ground-marshaling personnel’s failure to follow procedures/directives when they did not display an emergency stop signal to the flight crew of the other airplane. Factors contributing to the accident were heavy snow showers and snow-covered terrain."

The Report produces no Safety Recommendations.

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Further Reading

For further information see The NTSB Reports ANC02FA023A and ANC02FA023B

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