LAX99FA138

The airplane impacted terrain following an uncontrolled descent. The horizontal stabilator and the left wing separated while the airplane was in a descending right turn on the downwind side of a mountain. The pilot received a full preflight weather briefing and updated that with an abbreviated briefing prior to takeoff. The briefings included a forecast for moderate to severe turbulence and icing along the route of flight. While en route, the pilot experienced icing conditions and requested a lower altitude. He received pilot reports while en route that indicated icing conditions were being encountered in the area of his destination. The airplane was not equipped with anti-icing or deicing equipment. A Safety Board weather study identified conditions that were conducive for clouds, turbulence, wind shear, icing, and mountain wave activity.

History of flight

On April 3, 1999, at 1931 Pacific standard time (PST), a Piper PA-32R-301, N9254Q, collided with terrain during an uncontrolled descent near Warner Springs, California. Assist Business Services, Inc., owned the airplane and was operating it under the provisions of 14 CFR Part 91. The personal flight departed Deer Valley Airport (DVT) Phoenix, Arizona, about 1700. The private, instrument rated pilot and his three passengers sustained fatal injuries; the airplane was destroyed. The flight was en route to McClellan/Palomar Field, Carlsbad, California, on an IFR flight plan. Night visual meteorological conditions prevailed at Ramona, California, the nearest reporting station; however, weather conditions at the airplane's cruise altitude and at the impact site are unknown. The main wreckage's location was 33 degrees 09.443 minutes north latitude and 116 degrees 32.976 minutes west longitude. Site elevation, derived from a handheld GPS (global positioning system), was 2,930 feet.

The Safety Board Investigator-in-Charge (IIC) listened to recorded radio transmissions between the pilot and the Prescott, Arizona, Automated Flight Service Station (AFSS). The pilot filed a flight plan with the AFSS for an estimated departure time of 1700 PST. He filed for a cruise altitude of 10,000 feet. The route of flight was Deer Valley to the Buckeye VOR (very high frequency omni-directional radio range), Victor 16 to Blythe, Victor 460 to Julian, and vectors to Palomar.

The IIC listened to recorded radio transmissions between the pilot and the Los Angeles Air Route Traffic Control Center sector 9/10 (ZLA). About 1820, the pilot reported icing conditions and requested a lower altitude. ZLA cleared the pilot to descend to 9,000 feet and indicated 8,000 feet was available. However, ZLA pointed out that the pilot would have to climb to a higher altitude as he progressed along his route due to minimum en route altitude requirements. About 2 minutes later, the pilot requested to continue to 8,000 feet.

The IIC reviewed recorded radar data. About 1820, the airplane's secondary beacon (code 4106) indicated a descent began from a mode C reported altitude of 10,100 feet and continued to 8,200 feet. About 1824, the pilot reported that he was below the clouds, which were at 8,700 feet, and the ice was coming off.

About 1840, ZLA instructed the pilot to climb at his discretion to 9,000 feet. The pilot later requested and received clearance to climb to 10,000 feet. The secondary beacon indicated a climb began about 1840, and a mode C reported altitude of 10,200 feet was attained about 1900.

ZLA later instructed the pilot to descend and maintain 9,000 feet, and then on down to 8,000 feet. At 1924:26, the secondary beacon indicated a southwesterly descent began from a mode C reported altitude of 10,000 feet.

ZLA instructed the pilot to contact SOCAL Approach on frequency 123.2. The IIC reviewed a transcript of recorded radio transmissions between the pilot and Southern California TRACON San Diego North Radar (SDNR). About 1926, SDNR informed the pilot he was 9 miles northeast of the Julian VOR. SDNR instructed the pilot to cross Julian at or above 8,000 feet and cleared him for the ILS (instrument landing system) runway 24 Palomar via the Julian transition. At 1926:26, the pilot acknowledged clearance for the approach. No other transmissions were recorded from the pilot. At 1926:25, the secondary beacon indicated a mode C reported altitude of 9,200 feet.

The flight path and descent progressed toward the Julian VOR. The following mode C altitudes were recorded: at 1928:49, 9,000; at 1929:13, 8,900; at 1929:37, 8,800; and at 1930:01, 8,600. This computed to an average descent rate of 333 feet per minute (fpm) over this 72-second time frame. At 1930:25,the mode C reported altitude was 8,200 feet, which was a location less than 2 miles from the VOR. This computed to an average descent rate of over 1,700 fpm during this 24-second time frame. The secondary beacon indicated the descent continued, but the track began a turn to the right. The last secondary beacon target at 1930:37, indicated a mode C reported altitude of 7,900 feet. During this 12-second span, the descent rate computed to 1,500 feet per minute. The data indicated two more primary targets that continued turning to the right. The last apparent target occurred at 1931:01, at coordinates 33 degrees 09 minutes 45 seconds north latitude and 116 degrees 33 minutes 23 seconds west longitude.

About 1935, SDNR reported a loss of radio and radar contact with the airplane and issued an alert notice. A civil air patrol unit working another mission in the area received an ELT (emergency locator transmitter) signal and discovered the wreckage about 0225 Pacific daylight time on April 4th.

Personnel information

A review of Federal Aviation Administration (FAA) records revealed the pilot held a private pilot certificate with airplane single engine land and instrument ratings. A review of the pilot's logbook revealed his first flight was on February 3, 1997, and he received the private certificate on May 28, 1997. Total time at the private pilot check ride was 65.7 hours. The first flight logged in the accident airplane was May 14, 1997. He received the instrument rating on December 6, 1997. The last flight recorded in the logbook was on March 16, 1999, and as of that entry, total flight time was about 565 hours. He had about 520 hours in this make and model; about 35 hours were logged in the last 90 days. He received a third-class medical certificate with no limitations or waivers on March 6, 1997.

Aircraft information

The airplane was a New Piper Aircraft Corporation PA-32R-301, serial number 3246001. A maintenance facility completed an annual inspection on June 12, 1998, at a total time of 505.3 hours. The engine was a Textron Lycoming IO-540-K1G5, serial number L-25593-48A. Total time on the engine was 675.5 hours. The tachometer read 675.5 at the accident scene.

Meteorological information

The pilot obtained a weather briefing from the Prescott Automated Flight Service Station (AFSS) between 1536 and 1541 PST. The different segments of the brief follow.

An AFSS specialist advised him of current in-flight weather advisories. An AIRMET (Airman's Meteorological Information) existed for occasional moderate turbulence below flight level 180 and mountain obscuration. The specialist also advised that the Palomar, California, area would be just south of a SIGMET (Significant Meteorological Information) for severe turbulence below 14,000 feet with low-level wind shear potential.

The area forecast called for broken ceilings between 8,000 to 10,000 feet in the southern California desert areas. In the San Diego area ceilings could be between 3,000 and 5,000 feet with visibility unrestricted.

The terminal forecast into the southern California area called for ceilings of 4,000 feet broken, 15,000 feet broken, unrestricted visibility, surface winds from 160 degrees at 5 knots, with a 30 per cent chance of ceilings 3,000 feet broken and rain shower activity.

The AFSS specialist briefed Pilot Reports (PIREPS), which included two reports of up and down drafts between 1,000 and 1,500 feet per minute over Thermal, California. Another PIREP reported light rime ice over POGI VOR (195 degrees and 37 nautical miles from Julian).

The pilot asked for the freezing level over the mountains in southern California. The AFSS specialist responded that it was about 6,000 feet, and asked if the pilot had deicing equipment installed. The pilot replied he did not, and the AFSS specialist said that would be the pilot's main concern. The pilot asked for confirmation of only the one icing report and if a front that was moving south was in the San Diego area. The FSS specialist confirmed the lone icing report and said the front was not over San Diego