Mesa-Falcon Field

The private pilot and passenger departed on the 875-nautical-mile cross-country flight and leveled off at a cruise altitude of 24,000 feet mean seal level, which, based on the radar data, was accomplished with the use of the autopilot. About 1 hour 40 minutes after departure, the pilot contacted air traffic control personnel to request that he would “like to leave frequency for a couple of minutes.” No further radio transmissions were made. About 20 seconds after the last transmission, the airplane banked to the right, continued in a spiral while rapidly descending, and subsequently broke apart. At no time during the flight did the pilot indicate that he was experiencing difficulty or request assistance. Just prior to departing from the flight path, the pilot made an entry of the engine parameters in a flight log, which appeared to be consistent with his other entries indicating the airplane was not experiencing any difficulties. Portions of the wings, along with the horizontal stabilizers and elevators, separated during the breakup sequence. Analysis of the fracture surfaces, along with the debris field distribution and radar data, revealed that the rapid descent resulted in an exceedance of the design stress limits of the airplane and led to an in-flight structural failure. The airplane sustained extensive damage after ground impact, and examination of the engine components and surviving primary airframe components did not reveal any mechanical malfunctions or failures that would have precluded normal operation. The airplane was flying on a flight path that the pilot was familiar with over largely unpopulated hilly terrain at the time of the upset. The clouds were well below his cruising altitude, giving the pilot reliable external visual cues should the airplane have experienced a failure of either the flight instruments or autopilot. Further, no turbulence was reported in the area. The airplane was equipped with a supplemental oxygen system, which the pilot likely had his mask plugged into and available in the unstowed position behind his seat; the passenger’s mask was stowed under her seat. The airplane’s autopilot could be disengaged by the pilot by depressing the appropriate mode switch, pushing the autopilot disengage switch on the control wheel, or turning off the autopilot switch on the control head. All autopilot servos were also equipped with a clutch mechanism that allowed the servo to be manually overridden by the pilot at any time. It is likely that the reason the pilot requested to “leave the frequency” was to leave his seat and attend to something in the airplane. While leaving his seat, it is plausible he inadvertently disconnected the autopilot and was unable to recover by the time he realized the deviation had occurred.

The aircraft was destroyed when it impacted terrain in the Superstition Mountains near Apache Junction, Arizona. The commercial pilot and the five passengers were fatally injured. The airplane was registered to Ponderosa Aviation, Inc. (PAI) and operated by PAI under the provisions of 14 Code of Federal Regulations (CFR) Part 91 as a personal flight. Night visual meteorological conditions (VMC) prevailed, and no flight plan was filed. The airplane had departed Falcon Field (FFZ), Mesa, Arizona, about 1825 and was destined for Safford Regional Airport (SAD), Safford, Arizona. PAI’s director of maintenance (DOM) and the director of operations (DO), who were co owners of PAI along with the president, conducted a personal flight from SAD to FFZ. The DO flew the leg from SAD to FFZ under visual flight rules (VFR) in night VMC. After arriving at FFZ and in preparation for the flight back to SAD, the DOM moved to the left front seat to act as the pilot flying. The airplane departed FFZ about 12 minutes after it arrived. According to a witness, engine start and taxi-out appeared normal. Review of the recorded communications between the pilot and the FFZ tower air traffic controllers revealed that when the pilot requested taxi clearance, he advised the ground controller that he was planning an "eastbound departure." The flight was cleared for takeoff on runway 4R, and the pilot was instructed to maintain runway heading until advised, due to an inbound aircraft. About 90 seconds later, when the airplane was about 1.1 miles from the departure end of the runway, the tower local controller issued a "right turn approved" advisory to the flight, which the pilot acknowledged. Radar data revealed that the airplane flew the runway heading for about 1.5 miles then began a right turn toward SAD and climbed through an altitude of about 2,600 feet mean sea level (msl). About 1828, after it momentarily climbed to an altitude of 4,700 feet, the airplane descended to an altitude of 4,500 feet, where it remained and tracked in an essentially straight line until it impacted the mountain. The last radar return was received at 1830:56 and was approximately coincident with the impact location. The impact location was near the top of a steep mountain that projected to over 5,000 feet msl. Witnesses reported seeing a fireball, and law enforcement helicopters were dispatched.

The pilot executed the VOR approach to runway 21. He was heard to report passing the VORTAC outbound for the procedure turn, and crossing the VORTAC (final approach fix) inbound. Witnesses said they saw the airplane emerge from the overcast slightly high and fast. They said the airplane entered a steep left bank and turned about 90 degrees before disappearing in a snow shower northeast of the airport. They heard no unusual engine noises. Another witness near the accident site saw the airplane in a steep bank and at low altitude, "just above the power lines." Based on the witness location, the airplane had turned about 270 degrees. The witness said the wings "wobbled" and the nose "dipped," then the left wing dropped and the airplane descended to the ground "almost vertically." Members of the County Sheriff's Posse, who were at a gunnery range just north of the airport, reported hearing an airplane pass over at low altitude. One posse member said he heard "an engine pitch change." He did not see the airplane because it was "snowing heavily," nor did he hear the impact. An examination of the airplane revealed no anomalies. At the time of the accident, the weather at the destination airport was few clouds 300 feet, 900 feet broken, 3,200 feet overcast; visibility, 1/2 statute and snow; temperature, 32 degrees F.; dew point, 32 degrees F.; wind, 290 degrees at 10 knots, gusting to 15 knots; altimeter, 29.71 inches.

Pilot took off from Scottsdale at 1934 mst for a 13 nm flight to reposition the aircraft to home base. Within minutes the pilot advised ATC that he was 6 miles out with minimum fuel and requested no delay. He then asked for clearance to runway 22R and was cleared to land on runway 22R, at 1943 mst the pilot advised the tower that he was not going to make the runway. Both engines had stopped due to fuel exhaustion and the pilot made a forced landing 1/4 mile from the approach end of runway 22R in a level dirt area. The pilot reported the aircraft contained 120 lbs of fuel upon departure from Scottsdale and no low fuel warning was received. The pilot's operating handbook states the low fuel warning light should illuminate when there is less than 60 gallons of fuel in either tank or when there is less than 120 gallons total fuel on board. The manual also stated the aircraft burns 170 gph at 70 percent power. The pilot, sole on board, was seriously injured.

Following a dual engine change, the pilot test flew the aircraft. On initial climb, at about 500 feet agl, both engines began backfiring violently and lost power. According to the pilot, power sufficient for flight could not be obtained, and a forced landing was made about 0.75 miles from the airport. The landing occurred in open desert terrain and the aircraft was substantially damaged. The pilot acknowledged that he did not check the position of the control handles for the superchargers during either his preflight or pre-takeoff inspections. And the blowers had been inadvertently left set to the high blower position. According to the pilot, the checklist which he was using for the aircraft did not address the position of the blowers because for the past 15 years it had been company policy to 'wire the blowers to the low blower position.' Both occupants escaped uninjured.

A popping or backfiring sound was heard by several people who later observed the aircraft flying at low altitude on what appeared to be a final approach to runway 13 at Jennings Airport (located about 75 miles southwest of the departure point.) No radios were onboard the aircraft so no distress calls were made. Because of the wind this would have been a downwind landing. The aircraft then aborted the approach due to an aircraft landing from the opposite direction and appeared to start a left turn onto abase leg when it stalled, pitched nose down and impacted the ground with its landing gear and flaps extended. Wreckage examination revealed that all 3 blades of the right prop were bent smoothly and symmetrically rearward. However, no preimpact failure or malfunction of the right engine was found. There were no entries in the aircraft's logbook from 7/1/78 until 4/3/84 when the aircraft was inspected for the ferry flight. The pilot was not multi-engine rated and had not flown this type aircraft in about 10 years. The pilot's commercial certificate was revoked on 11/21/81. The pilot, sole on board, was killed.

During the takeoff roll at Mesa-Falcon Field Airport, the crew started the rotation but the aircraft did not liftoff. It overran, struck a 10 feet high dirt bank, crossed a road where it hit a truck and eventually came to rest in flames in an orange grove. Both pilots, en route to Chandler-Stellar Airpark on a test flight, were seriously injured and the aircraft was destroyed by fire.

Just after liftoff, while in initial climb, all four engines lost power. The captain attempted an emergency landing in a desert area when the airplane struck trees and crashed in flames few miles from the airport. The aircraft was totally destroyed by a post crash fire and all six occupants were killed. They were on their way to Kansas City to deliver the aircraft.