Austin-Robert Mueller

The pilot was established on the localizer portion of the instrument landing system approach outside the final approach fix in visual meteorological conditions above clouds. He was then given vectors away from the localizer course by an air traffic controller. The vectors were close together and included a left 90-degree turn, a descent, and a 180-degree right turn back toward the localizer course. During the right turn and descent, the airplane continued turning with increasing bank and subsequently impacted the ground. According to a pilot weather report and flight path data the pilot entered clouds as he was starting the right turn toward the localizer. The combination of descending turns while entering instrument conditions were conducive to spatial disorientation. Further, the heading changes issued by the air traffic controller were rapid, of large magnitude, and, in combination with a descent clearance, likely contributed to the pilot’s disorientation. Diphenhydramine, a drug that may impair mental and/or physical abilities, was found in the pilot’s toxicological test results. While the exact effect of the drug at the time of the accident could not be determined, it may have contributed to the development of spatial disorientation.

During the landing roll, the nose gear settled onto the runway, and the aircraft veered hard to the right. Application of the left brake had no effect. The airplane skidded, exited the runway, struck a runway marker, and collapsed the nose landing gear. The steering actuator had failed, the hydraulic fluid was lost from the steering actuator, and the fuselage received structural damage. The steering actuator assembly, p/n 1501-4, had accumulated 5,938.0 hours since new and had not been repaired or overhauled. Examination of the nose gear steering actuator cylinder by the metallurgist revealed that the cylinder fracture was the result of fatigue cracking initiated by an abrupt machining transition from the 45 degree thread ring chamfer to the straight wall of the cylinder. The engineering drawings appear to depict the radius at the fatigue origin as a continuation of the 0.03 inch to 0.06 inch radius adjacent to the fracture. However, the drawing is not clear on the specific intent of the transition between the nearby radius and the internal threads for the nut.

The pilot made a fairly long taxi from the ramp to the end of the runway and then started his takeoff roll with the parking brake still partially set. The brakes became very hot and the component parts expanded. After rolling almost 3,000 feet the brakes tightened up to the extent that both main gear tires started leaving black skid marks which continued until the aircraft ran off the end of the runway without obtaining flying speed, a distance of 3,168 feet. It was noted, through a design feature of the aircraft, that the parking brake handle could be placed in the released position without the brake being released. However, this would give the appearance that it had been released. The main gear tires were worn almost slick during this attempted takeoff. Both main gear brakes had been overheated during this time to the extent that they were destroyed. The aircraft was destroyed by collision with trees, rocks and a fire hydrant at the bottom of a hill off the end of the runway. The pilot escaped with serious injuries.

On final approach to Austin-Robert Mueller Airport, the left engine failed. The crew continued the approach but forgot to lower the landing gear. The airplane belly landed and slid for dozen yards before coming to rest. Two occupants, among them the copilot, were seriously injured while 16 other people escaped with minor injuries. The aircraft was written off.

At liftoff, the twin engine rolled to the right and crashed in flames. The aircraft was destroyed by a post crash fire and the pilot, sole on board, was slightly injured.

While approaching Austin-Robert Mueller Airport runway 12R in a cloud base at 500 feet, the twin engine airplane stalled and crashed in flames onto a house located few miles from the airfield. The aircraft was destroyed and all three occupants were killed. There were no casualties on the ground.

En route from Laredo to Dallas, one of the engine lost power due to oil exhaustion. The pilot was cleared to divert to Austin-Robert Mueller Airport but following a wrong approach configuration, the aircraft was not properly aligned. After touchdown on a wet runway, the airplane suffered hydroplaning then veered off runway and came to rest. All three occupants were uninjured while the aircraft was damaged beyond repair.