NTSB Identification: DEN90DTE04
For details, refer to NTSB microfiche number 42459A
Accident occurred JUL-22-90 at FOWLER, CO
Aircraft: OLSEN PURSUIT, registration: N23GG
Injuries: 2 Fatal.
WHILE ON A LOCAL FLT, THE ACFT IMPACTED THE GND ABOUT 3/10 OF A MILE SHORT OF RWY 4.THERE WERE NO KNOWN WITNESS TO THE ACDNT, THOUGH ONE PERSON SAW DUST FROM THE ACDNT SITE& WENT TO INVESTIGATE. THE AIRCRAFT CAME TO REST ON ITS BELLY & BURNED. THERE WASEVIDENCE THAT THE ACFT HAD IMPACTED IN A LEVEL ATTITUDE, BUT THERE WAS NO APPARENT FORWARDMOVEMENT OF THE ACFT AFTER PRINCIPAL IMPACT. NO PREIMPACT PART FAILURE OR MALFUNCTION OFTHE ACFT OR ENG WAS FOUND DURING THE INVESTIGATION. TOXICOLOGY EXAMS OF THE PLT’S &PSGR’S BLOOD SHOWED A CARBOXYHEMOGLOGIN (CARBON MONOXIDE) SATURATION OF 19% & 16%,RESPECTIVELY. THE TOXICOLOGIST NOTED THAT SMOKERS WOULD BE EXPECTED TO HAVE A SATURATIONLEVEL OF 3% TO 10%. ALSO, METABOLITES OF MARIJUANA (CARBOXYLE ACID) WERE FND IN THE PLT’S& PSGR’S BLOOD AT LOW LEVELS OF 9 & 7 NG/ML, RESPECTIVELY. THE SPECIFIC SOURCE OFCARBON MONOXIDE WAS NOT DETERMINED.
Probable Cause
FAILURE OF THE PILOT TO MAINTAIN ADEQUATE AIRSPEED ON FINAL APPROACH TO LAND, WHICHRESULTED IN AN INADVERTENT STALL. A FACTOR RELATE TO THE ACCIDENT WAS: THE PILOT’SPHYSICAL IMPAIRMENT FROM CARBON MONOXIDE.
