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N35533 accident description

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Crash location Unknown
Nearest city Hayden, CO
40.491918°N, 107.257558°W

Tail number N35533
Accident date 28 Oct 1998
Aircraft type Piper PA-31-350
Additional details: None

NTSB description


On October 28, 1998, approximately 0858 mountain standard time, a Piper PA-31-350, N35533, was destroyed following impact with terrain during an instrument approach to Hayden-Yampa Valley Airport, Hayden, Colorado. The instrument rated commercial pilot, the sole occupant in the airplane, was fatally injured. The airplane was operated by Sundance Air, Inc., of Denver, Colorado, under Title 14 CFR Part 135. Instrument meteorological conditions prevailed for the cross-country cargo flight which originated from Colorado Springs, Colorado, approximately 67 minutes before the accident. An IFR flight plan had been filed with the destination of Hayden, Colorado.

FAA records indicate that the pilot called Denver Automated Flight Service Station (AFSS) at 0606 and received a standard weather briefing for his flight from Colorado Springs, to Hayden, and to Rock Springs, Wyoming. At 0739, the pilot received his IFR clearance, and at 0751, he departed Colorado Springs for his flight to Hayden. According to FAA transcripts, Denver Air Route Traffic Control Center (ARTCC) cleared Barnacle 696 (N35533's call sign) to climb to 16,000 feet following departure.

As Barnacle 696 approached Hayden, the pilot requested the ILS-DME approach to runway 10 (see Aerodrome information/Aids to Navigation below). Two minutes later, at 0849, he called Denver ARTCC to change his request and asked for the VOR-B approach to runway 28. Denver ARTCC approved this request, and Barnacle 696 was cleared to descend to 12,000. At 0853, Barnacle 696 was cleared the approach. Two minutes later, he was told to contact Hayden CTAF.

According to an airport employee who was operating the Hayden Unicom, the pilot called at 0845 and requested airport advisories. The pilot called again at 0857 and requested ramp personnel be standing by with fuel and oxygen.

Airport personnel reported that the airplane failed to arrive and they subsequently notified local authorities. Search and rescue personnel located the airplane on Chavez Peak, at approximately 1230.


According to FAA records, the pilot received his commercial pilot certificate on May 25, 1994, and his flight instructor certificate on May 11, 1998. The pilot wrote on his last FAA medical application, dated November 3, 1997, that he had accumulated 1,411 hours of flight experience, and that he had flown 225 hours during the last 6 months.

The pilot's employer, Sundance Air, Inc., began training him in February 1998, and he completed his Part 135 qualification check ride on 04/23/98 (his employment start date). Company records indicate that the pilot had flown approximately 400 hours since his employment began.


The airplane was a propeller-driven, cargo configured airplane, which was manufactured by the Piper Aircraft Company in 1979. It was certificated for a maximum gross takeoff weight of 7,000 pounds. The airplane was powered by two Textron Lycoming TIO-540-J2BD, six cylinder, reciprocating, horizontally opposed, fuel injected, turbocharged engines which had a maximum takeoff rating of 350 horsepower. At the time of the last maintenance inspection, on October 9, 1998, the aircraft records indicated that the airframe had accumulated 12,411 hours.

The airplane's instrument panel was setup in such a way that the ILS and VOR displays were separate from the DME display. Only one DME display was provided with a selector switch that selected either Nav 1 or Nav 2 DME.


At 0856, the weather conditions at the Yampa Valley Airport (elevation 6,604 feet), 285 degrees 6 nm from the accident site (elevation 7,900 feet), were as follows: wind 280 degrees at 11 knots; visibility 5 statute miles; cloud condition 1,800 feet overcast; temperature 37 degrees Fahrenheit; dew point 36 degrees Fahrenheit; altimeter 30.05 inches of mercury. A witness at the airport reported that he believed that the weather conditions were worse (falling snow) to the south and east of the airport.

At approximately 1000, rescue personnel got within 300 feet of the airplane (but did not find it), and reported near zero visibility weather conditions with clouds and falling snow. The airplane was located approximately 3.5 hours later, when the weather conditions cleared.


The Yampa Valley Airport is uncontrolled with a Common Traffic Advisory Frequency (CTAF) of 123.0. The airport is serviced by a Very High Frequency Omnidirectional Radio (VOR) navigation antenna(CHE, 115.6 MHz) which is located 288 degrees at 5.4 nautical miles (nm) from the approach end of runway 28. The VOR antenna is co-located with a Distance Measuring Equipment (DME) signal, which will provides the distance in nm to the antenna. These two signals provide the necessary information for a pilot to fly the VOR DME-B instrument approach to runway 28 (see attached instrument approach plate). The minimum altitude that a pilot may fly on this instrument approach is 7,900 feet. If the pilot can't see the runway by 5.4 nm, he is instructed to execute a missed approach.

The Yampa Valley VOR DME-B instrument approach is designated a "B" approach because its gradient (545 feet per mile) is greater than the 400 feet per mile allowed in the Terminal Instrument Procedures (TERPS). Circle-To-Land criteria is utilized after the 400 feet per mile decent requirement is exceeded on a VOR non-precision instrument approach.

Runway 10 is serviced by an Instrument Landing System (ILS). This precision approach has its own dedicated DME signal which originates at the localizer antenna, located on the departure end of runway 10. If a pilot would fly over this localizer antenna, his ILS-DME would read "0," but, if at the same moment he would select the CHE VOR, his DME would read 5.4 nm.


The airplane was found on a tree covered mountain (Chavez Peak, elevation 8,106 feet) approximately 5.8 nm from the approach end of runway 28 (N40 degrees 25 minutes 43.1 seconds, W107 degrees 05 minutes 35.5 seconds). Tree branches littered the ground on a heading of 285 degrees to the wreckage. A ground scar, wreckage debris, and scattered cargo, extended up-slope (approximately 45 degrees) for approximately 70 feet (see attached diagram). The elevation of the wreckage was determined to be 7,900 feet.

The empennage was separated from the fuselage just aft of the rear cabin door area. The forward cabin section and cockpit area were fragmented by impact damage. The left wing separated form the fuselage and came to rest on top of the right wing. All the instrument panel components were destroyed, including the DME head and its Nav 1/Nav 2 selector switch.

All flight control surfaces were accounted for; control cable continuity could not be established due to impact damage. Both engine's crankshafts were rotated by hand, and thumb compression was observed on all six cylinders of each engine. Valve continuity was visually confirmed, and all accessory gears rotated on both engines. The turbocharger compressor blades were found undamaged and displayed coloration consistent with normal operation on both engines. Both turbocharger shafts rotated freely by hand.

The left engine's 3 propeller blades displayed leading edge gouging, chordwise striations across the cambered surface, and "S" bending. One of the blades separated from the propeller hub, and was located near the initial ground scar. The right 3 propeller blades remained attached to the hub, which was found separated from its crankshaft flange. The 3 propeller blades on the right engine also displayed leading edge gouging, chordwise striations across the cambered surface, and "S" bending.

All major components of the airplane were accounted for at the accident scene. There was no evidence of pre or postimpact fire. No preimpact engine or airframe anomalies, which might have affected the airplane's performance, were identified.


An autopsy was performed on the pilot by Dr. Ben Galloway, a forensic pathologist, with the Routt County Coroner's Office, Steamboat Springs, Colorado, on October 29, 1998.

Toxicology tests were performed on the pilot by the FAA's Civil Aeromedical Institute (CAMI) in Oklahoma City, Oklahoma. According to CAMI's report (#9800299001), the pilot's carbon monoxide and cyanide tests were not performed due to lack of suitable specimens, and the volatiles that were identified were attributed to postmortem production. No drugs were detected in the liver fluid.


The airplane, including all components and logbooks, was released to a representative of the owner's insurance company on January 29, 1999.

(c) 2009-2018 Lee C. Baker / Crosswind Software, LLC. For informational purposes only.