Dallas-Executive (Redbird)

The Boeing B-17 was taking part to an airshow at Dallas-Executive (Redbird) Airport, carrying five people. While passing over the airfield at a relative low altitude, it collided with a Bell P-63 Kingcobra that was engaged in the same manoeuvre and coming from its left. The B-17 was cut in two, entered an uncontrolled descent and crashed in a field, bursting into flames. The P-63 was also destroyed. All six people in both aircraft were killed. At the time of the collision, the B-17 was following a straight-in course while the P-63 was supposed to cut its trajectory behind. Obviously, the pilot of the P-63 misjudged the situation.

Witnesses reported observing the airplane flying slowly toward the airport at a low altitude. The left engine was at a low rpm; "sputtering," "knocking," or making a "banging" noise; and trailing black smoke. One witness said that, as the airplane passed over his location, he saw the tail "kick" horizontally to the right and the airplane bank slightly left. The airplane subsequently collided with trees and impacted a field 1/2 mile north of the airport. Disassembly of the right engine revealed no anomalies, and signatures on the right propeller blades were consistent with power and rotation on impact. The left propeller was found feathered. Disassembly of the left engine revealed that the spark plugs were black and heavily carbonized, consistent with a rich fuel-air mixture; the exhaust tubing also exhibited dark sooting. The rubber boot that connected the intercooler to the fuel injector servo was found dislodged and partially sucked in toward the servo. The clamp used to secure the hose was loose but remained around the servo, the safety wire on the clamp was in place, and the clamp was not impact damaged or bent. The condition of the boot and the clamp were consistent with improper installation. The time since the last overhaul of the left engine was about 1,050 hours. The last 100-hour inspection occurred 3 months before the accident, and the airplane had been flown only 0.8 hour since then. It could not be determined when the rubber boot was improperly installed. Although the left engine had failed, the pilot should have been able to fly the airplane and maintain altitude on the operable right engine, particularly since he had appropriately feathered the left engine.

The right engine of the aircraft failed three times in flight. After the last failure near the middle marker the pilot feathered the propeller. The aircraft collided with power lines and the ground about 400 yards short of runway 31 at the Redbird Airport. The right fuel selector was positioned to the left rear tank and the left selector was positioned to the off position. The left wing tanks were intact and empty. Both engines had failed due to fuel exhaustion. Two airports were overflown that were adequate for landing and that had fuel available. This was the co-pilot's first flight.

Airplane crashed during a uncontrolled descent, following a turbulence upset at FL370. The upset occurred as a result of clear air turbulences associated with a vip level 6 thunderstorm located within 7 miles of the last position of the airplane. After the upset, the airplane penetrated and descended thru the cell which contained lightning, extreme turbulences and severe icing. During the upset/descent both engines flamed out and the crew's attempts to recover the airplane were unsuccessful due to conditions in the cell. Crew received an improper briefing from FSS and reported their radar was malfunctioning to the deputy controller. Sigmet and AWW info was not given during the briefing. As the airplane came out of the bottom of the cell at 4,000 feet, the crew overstressed the airplane causing the left main landing door to separate and hit the left horizontal stab which subsequently separated in overload. Impact was 82° nose down. Nature of the airplane radar malfunction could not be determined. All seven occupants were killed.

Upon touchdown at San Angelo-Mathis Field Airport, the twin engine airplane swerved then nosed over and came to rest in flames. All four occupants escaped with minor injuries while the aircraft was destroyed.