1956 XP6M-1, 138821, c/n XP-1
four 13000 lbs Allison J71-A-6
One of two prototypes. The other was 138822. Both broak up during flight testing.
This one crashed into Potomac River near junction of St. Mary's River Dec 7, 1955. 4 killed. Accident caused by malfunction in control system which caused violent pitchdown resulting in aircraft disintegration.
