Emergency Declaration
After takeoff, while climbing through 10,000 feet MSL, the pilot declared an emergency. The pilot stated he was having vacuum problems and was on partial panel.
Request for Guidance
Salt Lake City ARTCC responded to the pilot's request for guidance, providing instructions for a VFR landing with no gyro vector back to Boise. The pilot then reported a problem with the turn coordinator and that the vacuum pump was not operating.
Loss of Contact
At 0856, the aircraft disappeared from the radar scopes of Salt Lake City ARTCC and Boise Approach Control. No further radio contact was made with the aircraft.
Wreckage Discovery
The wreckage was found 18 miles southeast of Boise. The aircraft had impacted the ground at a near vertical angle, striking the nose and left wing first.
Examination of Vacuum Pump
Examination of the dry air vacuum pump revealed preimpact failure damage.
Probable Cause
The investigation did not state a probable cause.