Accident Lockheed 18-56-23 Lodestar N33366, Thursday 29 December 1955
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Date:Thursday 29 December 1955
Type:Silhouette image of generic L18 model; specific model in this crash may look slightly different    
Lockheed 18-56-23 Lodestar
Owner/operator:Gulf Oil Corporation
Registration: N33366
MSN: 18-2387
Year of manufacture:1943
Engine model:Wright R-1820-72
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Destroyed, written off
Location:7,5 km NW of Londonderry, OH -   United States of America
Phase: En route
Departure airport:Tulsa International Airport, OK (TUL/KTUL)
Destination airport:Pittsburgh International Airport, PA (PIT/KPIT)
Investigating agency: CAB
Confidence Rating: Accident investigation report completed and information captured
The flight departed Tulsa at 18:10 CST and routine position reports were made until over Dayton, Ohio, at 12:00. Over Dayton the aircraft entered icing conditions at the cruise altitude of 9000 feet. The crew requested permission twice to descend to a lower altitude to evade the icing conditions, but these requests were turned down. Around 12:35 the pilot reported "Difficulty maintaining altitude and airspeed request lower altitude." At 12:37 Columbus CAA cleared the flight to descend to 8,000 feet msl. At approximately 12:40 witnesses observed the aircraft below the overcast; it was on a westerly heading and was descending although it appeared to be in a normal attitude. Several components were seen to separate from the aircraft before it struck the ground in a steep angle.

PROBABLE CAUSE: "The Board determines that the probable cause of this accident was the accumulation of enough ice to result in loss of control and the subsequent shedding of vertical surfaces from the tail group of the aircraft."

Accident investigation:
Investigating agency: CAB
Report number: final report
Status: Investigation completed
Download report: Final report


CAB File No. 2-0061

Revision history:


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