4 fatalities

Mid-Air Collision Between Two Boeing KB-29P Superfortresses Near Morigny (44-83906)

Morigny, FranceFlight

On February 2, 1957, a Boeing B-29 Superfortress (registration 44-83906) operated by United States Air Force - USAF (since 1947) was involved in an aviation accident near Morigny, France in flight. 4 people were killed. Investigators recorded the probable cause as: In-flight collision following a loss of speed of the first aircraft for undetermined reason. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

Two USAF Boeing KB-29P Superfortresses collided in low visibility near Morigny, France. One aircraft lost speed for undetermined reasons, leading to a fatal crash with multiple casualties.

Incident Overview and Aircraft Details On a training mission departing from RAF Sculthorpe, a Boeing KB-29P Superfortress encountered another USAF Boeing KB-29P Superfortress while cruising at 15,000 feet in low visibility due to poor weather. The first aircraft, registered 44-69846, was carrying a crew of ten and lost speed for an undetermined reason. The second aircraft, registered 44-83906, was flying in front of the first when the collision occurred. Following the mid-air collision, both airplanes went out of control, dove into the ground, and crashed in a field located in Morigny, approximately 25 km south of Saint-Lô. ## Casualties and Survival Outcomes The collision resulted in significant loss of life. On the ten crew members aboard 44-69846, one person survived. On board 44-83906, five crew members survived while four others were killed. It appears that some of the survivors were able to bail out prior to impact. Among those killed were M/Sgt. Lawrence M. Grigory, A2c Arthur B. Kosier, and A3c Franklin D. Schweigert.

Probable cause

In-flight collision following a loss of speed of the first aircraft for undetermined reason.