|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : hec|
|Altitude||msl bound lower : 20000|
msl bound upper : 21300
|Controlling Facilities||artcc : zla|
|Operator||general aviation : corporate|
|Make Model Name||Light Transport, Low Wing, 2 Turbojet Eng|
|Navigation In Use||Other|
|Flight Phase||climbout : intermediate altitude|
|Route In Use||enroute : direct|
|Function||flight crew : single pilot|
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 125|
flight time total : 10000
flight time type : 1000
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Anomaly||altitude deviation : overshoot|
non adherence : clearance
|Independent Detector||other controllera|
other other : unspecified cockpit
|Resolutory Action||flight crew : returned to intended course or assigned course|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
Picked up IFR clearance from lax center 126.35 at 17500 MSL. Was cleared direct hector VOR to maintain FL200. When called by center, climb had continued to approximately 21300. Center did not indicate if there was a traffic conflict. We fly this light transport with a single pilot waiver. I was the sole occupant of the aircraft, returning to las after a drop off. I was using FMS to go direct to hec. Autoplt was on and altitude preselect was set to assigned altitude FL200. Autoplt trim wheel is very sensitive. If touched even slightly it can cancel altitude preselect mode. While my attention was diverted by some paperwork I must have accidently bumped the autoplt trim wheel. There is no aural warning for this. Only when the entire autoplt is disabled is there a warning. Prevention: be more vigilant, monitor autoplt very carefully especially in climb/descent modes. Install a guard to prevent accidental touching of trim wheel.
Original NASA ASRS Text
Title: CORP PLT HAS ALTDEV AT LEVEL OFF TO ASSIGNED ALT.
Narrative: PICKED UP IFR CLRNC FROM LAX CENTER 126.35 AT 17500 MSL. WAS CLRED DIRECT HECTOR VOR TO MAINTAIN FL200. WHEN CALLED BY CENTER, CLB HAD CONTINUED TO APPROX 21300. CENTER DID NOT INDICATE IF THERE WAS A TFC CONFLICT. WE FLY THIS LTT WITH A SINGLE PLT WAIVER. I WAS THE SOLE OCCUPANT OF THE ACFT, RETURNING TO LAS AFTER A DROP OFF. I WAS USING FMS TO GO DIRECT TO HEC. AUTOPLT WAS ON AND ALT PRESELECT WAS SET TO ASSIGNED ALT FL200. AUTOPLT TRIM WHEEL IS VERY SENSITIVE. IF TOUCHED EVEN SLIGHTLY IT CAN CANCEL ALT PRESELECT MODE. WHILE MY ATTN WAS DIVERTED BY SOME PAPERWORK I MUST HAVE ACCIDENTLY BUMPED THE AUTOPLT TRIM WHEEL. THERE IS NO AURAL WARNING FOR THIS. ONLY WHEN THE ENTIRE AUTOPLT IS DISABLED IS THERE A WARNING. PREVENTION: BE MORE VIGILANT, MONITOR AUTOPLT VERY CAREFULLY ESPECIALLY IN CLB/DSCNT MODES. INSTALL A GUARD TO PREVENT ACCIDENTAL TOUCHING OF TRIM WHEEL.
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.