N910PA

HISTORY OF FLIGHT

On February 25, 2011, about 2005 mountain standard time, a Piper PA-28-181, N910PA, impacted mountainous terrain about 20 miles northeast of Deer Valley Airport (DVT), Phoenix, Arizona. Bird Acquisition LLC., d.b.a. TransPac Aviation Academy, operated the airplane under the provisions of 14 Code of Federal Regulations Part 141, as an instructional flight. The certified flight instructor (CFI) and two students were fatally injured. The airplane was substantially damaged during the impact sequence and subsequent post impact fire. Night visual meteorological conditions prevailed for the night instrument training flight. A company flight plan had been filed for the night flight that had departed DVT about 1907. The flight was scheduled to return to DVT about 2230.

According to the operator, the flight was dispatched at 1847 with a CFI and two students to conduct a training flight. The accident flight was the ninth lesson out of 40 lessons in the instrument rating, Chinese Ab-initio Course syllabus, and was an introduction to VOR (very high frequency omnidirectional range) and GPS (global positioning system) tracking and intercepting.

The airplane was refueled by Cutter Aviation with an addition of 34 gallons 100-low lead aviation fuel, as requested by the CFI, at 1900. The airplane departed shortly thereafter.

At 2230, the operator expected that the airplane would be back at their facility. At 2300, a late alarm sounded notifying the operators' dispatchers of the overdue airplane. At that point, the operator's emergency response plan was initiated, which included notifying the sheriff's department, DPS (Department of Public Safety), ARTCC (Air Route Traffic Control Center), FSS (Flight Service Station), TRACON (Terminal Radar Approach Control), and CAP (Civil Air Patrol). The following morning, search and rescue crews located airplane wreckage north of Carefree, Arizona, near the summit of Bronco Peak.

There were no known witnesses to the accident.

PERSONNEL INFORMATION

The 23-year-old CFI seated in the right front seat, had been hired by TransPac Aviation Academy on September 27, 2010. The CFI's logbook was not made available to the investigation team. The aeronautical experience listed in this report was obtained from her employment application with the flight school, as well as the flight school's "person pilot log." According to flight records, from the time period of September 27, 2010, until February 25, 2011, the CFI had accrued 288.9 hours of flight time in the accident make and model airplane. For the month of February 2011, she had accrued 65.8 hours. The CFI held a first-class medical with no limitations, issued on February 5, 2008. Prior to her CFI position at TransPac Aviation Academy, the CFI had instructed at Alliance Flight Schools in Scottsdale, Arizona.

The 21-year-old private pilot seated in the left front seat received his private pilot certificate with rating for airplane single engine land on February 17, 2011. A review of his flight log from the flight school showed a total time of 97.2 total hours, and in the make/model of the accident airplane. He held a third-class medical issued on September 22, 2010, with no limitations. The pilot had been enrolled at the flight school since September 20, 2010; the FAA approved program he was enrolled under was identified as the Chinese Ab-Initio Program.

METEOROLOGICAL INFORMATION

Reported Aviation Routine Weather Report (METAR) for DVT at 1853 reported calm wind; clear skies; visibility 10 miles; temperature was 14 degrees Celsius; dew point was minus 01 degrees Celsius; altimeter setting was 29.90 inches of Mercury.

Sunset for the day of the accident as calculated by the United Sates Observatory Astronomical Applications Department was determined to be 1822, which was followed by the end of civil twilight at 1847. The phase of the moon for that day was a waning crescent with 41-percent of the moon's visible disk illuminated.

According to the Federal Aviation Administration (FAA), the definition of night flight is the period between 1 hour after sunset and 1 hour before sunrise.

AIRCRAFT INFORMATION

The airplane was a 1999 Piper PA-28-181, serial number 2843300. The airplane had a progressive inspection Event 2 performed on February 15, 2011. The recorded airplane total time was 13,646.3 hours; engine total time was 8,484.3 hours and propeller total time was 212.4 hours. According to the flight school, from February 15 to the date of the accident the airplane had flown a total of 26.3 hours; airframe total time was 13,672.6 hours, engine total time was 8,510.6 hours, and propeller had 238.7 hours, time since new.

A Lycoming normally aspirated O-360-A4M engine, serial number L-27382-26A, powered the accident airplane. The recorded engine total time at the last condition inspection was 8,510.6 hours since new, with 238.7 hours flown since overhaul.

WRECKAGE AND IMPACT INFORMATION

The accident site was located in the Tonto National Forest, identified as Bronco Peak, at an elevation of 4,600 feet. The wreckage came to rest on a 10-degree slope with the debris path oriented along a magnetic heading of 020 degrees. The first identified point of impact (FIPC) was on the north-facing side of the Bronco Peak summit, which consisted of pieces of the left wing, and was about 900 feet south of the main wreckage.

On the north face was a vertical rock outcropping that was oriented along a north and south heading. A section of the left wing with the aileron attached, was located about halfway down the rock outcropping. The height of the rock outcropping was estimated to be about 15 feet in height. At the top of the rock outcropping were paint chips, as well as aluminum transfer. An inspection of this section of wing revealed that the bell crank remained in the wing along with the attached aileron cables; the cables had separated and exhibited overload signatures. About 20 feet upslope of the outboard left wing was the left wing center section. Both of these pieces were located on the southeast side of the rock outcropping.

On the northwest side of the rock outcropping, about 50 feet upslope from the FIPC, the left inboard wing section with flap and fuel tank was located with the fuel cap, which remained secured in its normal location. Approximately 30 feet upslope of the left inboard wing section was the left main landing gear. No debris from the left landing gear was located at the top of the saddle.

Another debris field was identified on the south side of the summit approximately 750 feet away from the FIPC. This area consisted of shards of Plexiglas, as well as desert vegetation with pulled up roots. The main wreckage came to rest about 150 feet downslope of the second debris path; there were no other major components from the FIPC's debris path to the second debris path.

The main wreckage consisted of the fuselage, empennage and tail section, and the engine. The fuselage section was inverted and mostly consumed by the post-crash fire. The empennage section exhibited fire damage. The tail section came to rest inverted, and all flight control surfaces remained attached. Due to terrain and environmental conditions, partial control continuity was verified from the tail to cabin area. All major flight control surfaces were identified on-scene.

In the cabin area (forward cockpit controls), both horizontal stabilator cables remained attached to the T-bar assembly; however, the T-bar assembly was not attached to any structure in the forward cockpit area. The left rudder cable remained attached to the rudder pedal bar by its link. The link remained attached to the rudder tube. During the on-site investigation the right rudder cable and the aileron cables or chains were not located.

At the tail section both rudder cables remained attached to the rudder horn. The trim drum assembly was displaced from the tail cone section due to fire damage. Five exposed threads on the top of the trim drum jack screw were measured, which correlated to a neutral trim position. All tail section control surfaces were present, but fire damaged.

The right wing with landing gear separated from the fuselage and came to rest about 25 feet upslope of the main wreckage. The wing was complete with control surfaces attached; there was no evidence of fire noted on the wing.

The engine came to rest inverted facing downhill on a 020-degree heading, which was in line with the airplane's direction of travel when it struck the rock outcropping at the FIPC. It remained attached to the firewall by wires and cables. The propeller remained attached via the propeller assembly and crankshaft. There were no obvious holes in the crankcase, but a crack in the crankcase in between the Nos. 2 and 4 cylinders was noted. The accessory section sustained thermal damage.

Once at the staging area the left wing was laid out in its entirety for further examination, as it had been fragmented into several pieces at the accident site. At the wing tip section leading to trailing edge accordion crush damage was observed. The crush damage angle was consistent with straight-and-level flight.

Radar Data

Radar data obtained from the Phoenix Terminal Radar Approach Control (TRACON) facility, identified the accident airplane departing DVT and proceeding toward the Carefree Sky Ranch Airport (18AZ) passing over the airport at 5,000 feet at 1943. The radar target continued on a north-northeast heading following Victor 327 airway and climbing to 6,100 feet. At 1951, the radar target turned back to follow Victor 327 toward Phoenix at 6,000 feet. At 1958, the radar target passed over the east side of 18AZ along Victor 327 at 5,000 feet. At 2000, the radar target was positioned southeast of 18AZ at 4,500 feet, it then showed a 180-degree left turn to a northwest heading, followed by a turn to the north, and maintained altitude at 4,500 feet. At 2004, the radar target was at 4,500 feet on ...