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An aircraft climbs above FL180 when the autoplt altitude hold mode disconnects and the flight crew is distracted with training.
| Attributes | |
| ACN | 332692 |
| Time | |
| Date | 199604 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : acr |
| State Reference | TX |
| Altitude | msl bound lower : 17500 msl bound upper : 18600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw tower : sdf |
| Operator | general aviation : corporate |
| Make Model Name | Chancellor 414A & C414 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 35 flight time total : 5800 flight time type : 800 |
| ASRS Report | 332692 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance non adherence : published procedure other anomaly other other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The flight profile was a maintenance test flight and chkout for a new company pilot. I was in right seat explaining test procedures. While VFR level at 17500 ft MSL, the altitude hold function of the autoplt inadvertently disconnected. The plane climbed through FL180. Center advised me of local altimeter setting. I noticed deviation at FL186 and corrected back to 17500 ft. Lesson learned: you must continue to monitor airspeed, altitude and attitude regardless of what your autoplt switch position indicates.
Original NASA ASRS Text
Title: AN ACFT CLBS ABOVE FL180 WHEN THE AUTOPLT ALT HOLD MODE DISCONNECTS AND THE FLC IS DISTRACTED WITH TRAINING.
Narrative: THE FLT PROFILE WAS A MAINT TEST FLT AND CHKOUT FOR A NEW COMPANY PLT. I WAS IN R SEAT EXPLAINING TEST PROCS. WHILE VFR LEVEL AT 17500 FT MSL, THE ALT HOLD FUNCTION OF THE AUTOPLT INADVERTENTLY DISCONNECTED. THE PLANE CLBED THROUGH FL180. CTR ADVISED ME OF LCL ALTIMETER SETTING. I NOTICED DEV AT FL186 AND CORRECTED BACK TO 17500 FT. LESSON LEARNED: YOU MUST CONTINUE TO MONITOR AIRSPD, ALT AND ATTITUDE REGARDLESS OF WHAT YOUR AUTOPLT SWITCH POS INDICATES.
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.