|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : ism.airport|
|Altitude||agl single value : 5500|
|Controlling Facilities||tracon : mco.tracon|
|Operator||general aviation : personal|
|Make Model Name||PA-30 Twin Comanche|
|Operating Under FAR Part||Part 91|
|Flight Phase||descent : intermediate altitude|
|Route In Use||approach : visual|
arrival : on vectors
|Function||flight crew : single pilot|
|Qualification||pilot : multi engine|
pilot : instrument
pilot : private
|Experience||flight time last 90 days : 30|
flight time total : 2000
flight time type : 500
|Affiliation||government : faa|
|Function||controller : approach|
|Anomaly||altitude deviation : excursion from assigned altitude|
non adherence : clearance
|Independent Detector||other controllera|
|Resolutory Action||controller : issued new clearance|
flight crew : returned to assigned altitude
|Problem Areas||Flight Crew Human Performance|
|Primary Problem||Flight Crew Human Performance|
On approach to kissimmee gateway (ism) I requested a lower altitude from 5000 ft. I was cleared to descend to 4000 ft. I programmed the autoplt to descend to 4000 ft. However; I did not activate the information. I then commanded the autoplt to respond. Because I had not entered the information; the autoplt then took the airplane up; rather than down. I did not notice it until ATC called me at 5500 ft. I corrected the altitude error and was cleared to 3000 ft. The remainder of the flight was unremarkable. My error was not using the autoplt correctly and then not monitoring it and stopping the altitude error.
Original NASA ASRS Text
Title: PA30 PLT PROGRAMMED THE AUTOPILOT FOR A DESCENT; BUT FAILED TO ACTIVATE THE COMMAND; RESULTING IN A CLIMB AND ALT DEVIATION.
Narrative: ON APCH TO KISSIMMEE GATEWAY (ISM) I REQUESTED A LOWER ALT FROM 5000 FT. I WAS CLRED TO DSND TO 4000 FT. I PROGRAMMED THE AUTOPLT TO DSND TO 4000 FT. HOWEVER; I DID NOT ACTIVATE THE INFO. I THEN COMMANDED THE AUTOPLT TO RESPOND. BECAUSE I HAD NOT ENTERED THE INFO; THE AUTOPLT THEN TOOK THE AIRPLANE UP; RATHER THAN DOWN. I DID NOT NOTICE IT UNTIL ATC CALLED ME AT 5500 FT. I CORRECTED THE ALTITUDE ERROR AND WAS CLRED TO 3000 FT. THE REMAINDER OF THE FLT WAS UNREMARKABLE. MY ERROR WAS NOT USING THE AUTOPLT CORRECTLY AND THEN NOT MONITORING IT AND STOPPING THE ALTITUDE ERROR.
Data retrieved from NASA's ASRS site as of May 2009 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.