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Homebuilt aircraft has takeoff problem at 6700 ft airport due mixture control problem. Makes adjustment, climbs out.
| Attributes | |
| ACN | 215874 |
| Time | |
| Date | 199207 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jac |
| State Reference | WY |
| Altitude | agl bound lower : 50 agl bound upper : 150 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dvt |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Flight Phase | climbout : initial climbout : takeoff |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 2500 flight time type : 650 |
| ASRS Report | 215874 |
| Person 2 | |
| Affiliation | Other |
| Function | observation : passenger |
| Qualification | pilot : private |
| Events | |
| Anomaly | aircraft equipment problem : critical other spatial deviation |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
During takeoff from jackson, wy (strong crosswind, 6400 ft base el, temperature 70 degrees). My copilot was having difficulty controling both the mixture (not leaned enough) and the direction (torque at crosswind) of my taildragger. I took control of the airplane, adjusted the mixture to peak egt, got it tracking straight down the runway (18) and took off. After taking off I accelerated until about 120 mph and began a left climbing turn to my on course heading of 350 degrees. At about 150 ft AGL and 130 mph the engine started running very rough. As the airspeed and altitude began to bleed away (and fairly quickly at that density altitude), I noticed the egt had climbed past the takeoff setting. I eased the mixture control in and hoped that it wasn't bad gas or vapor lock. After adjusting the mixture in a bit too far, the engine was running rough due to mixture too rich. By the time I got the mixture adjusted I had dished out to 50 ft AGL and down to 90 mph and was thinking about the crash landing. As the engine began producing full power, we leveled off, accelerated a bit, and began an immediate left turn to avoid rising terrain. We then climbed out to the nnw at our best rate of climb.
Original NASA ASRS Text
Title: HOMEBUILT ACFT HAS TKOF PROBLEM AT 6700 FT ARPT DUE MIXTURE CTL PROBLEM. MAKES ADJUSTMENT, CLBS OUT.
Narrative: DURING TKOF FROM JACKSON, WY (STRONG XWIND, 6400 FT BASE EL, TEMP 70 DEGS). MY COPLT WAS HAVING DIFFICULTY CTLING BOTH THE MIXTURE (NOT LEANED ENOUGH) AND THE DIRECTION (TORQUE AT XWIND) OF MY TAILDRAGGER. I TOOK CTL OF THE AIRPLANE, ADJUSTED THE MIXTURE TO PEAK EGT, GOT IT TRACKING STRAIGHT DOWN THE RWY (18) AND TOOK OFF. AFTER TAKING OFF I ACCELERATED UNTIL ABOUT 120 MPH AND BEGAN A L CLBING TURN TO MY ON COURSE HDG OF 350 DEGS. AT ABOUT 150 FT AGL AND 130 MPH THE ENG STARTED RUNNING VERY ROUGH. AS THE AIRSPD AND ALT BEGAN TO BLEED AWAY (AND FAIRLY QUICKLY AT THAT DENSITY ALT), I NOTICED THE EGT HAD CLBED PAST THE TKOF SETTING. I EASED THE MIXTURE CTL IN AND HOPED THAT IT WASN'T BAD GAS OR VAPOR LOCK. AFTER ADJUSTING THE MIXTURE IN A BIT TOO FAR, THE ENG WAS RUNNING ROUGH DUE TO MIXTURE TOO RICH. BY THE TIME I GOT THE MIXTURE ADJUSTED I HAD DISHED OUT TO 50 FT AGL AND DOWN TO 90 MPH AND WAS THINKING ABOUT THE CRASH LNDG. AS THE ENG BEGAN PRODUCING FULL PWR, WE LEVELED OFF, ACCELERATED A BIT, AND BEGAN AN IMMEDIATE L TURN TO AVOID RISING TERRAIN. WE THEN CLBED OUT TO THE NNW AT OUR BEST RATE OF CLB.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.