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Emb 120 maintaining FL180 with clearance to descend 11000 ft pilot's discretion. First officer copied altimeter setting 30 pt 54. Through the autoplt climb button, first officer attempted to correct the altitude discrepancy. Aircraft began a climb which he was unable to stop before he was off altitude 250 ft high. Advised center they were leaving FL180 for 11000 ft. Not familiar with the autoplt system.
| Attributes | |
| ACN | 352580 |
| Time | |
| Date | 199611 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rid |
| State Reference | IN |
| Altitude | msl bound lower : 18000 msl bound upper : 18250 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Xingu EMB-121 All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 2500 flight time type : 300 |
| ASRS Report | 352580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far |
| Independent Detector | other flight crewa |
| 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:
In cruise flight with pilot's discretion to 11000 ft, we were given an altimeter setting of 30.54. I dialed it into my side and tried to correct the altimeter discrepancy by engaging the climb button on and off. This started a climb that wouldn't stop (as I thought it would). I corrected the climb (250 ft) by disengaging the autoplt and manually descending. We were queried by ATC. We then called our descent (pilot's discretion) to 11000 ft. No apparent conflict. I blame my lack of total understanding of the autoplt system and slight loss of situational awareness. Fatigue not a factor.
Original NASA ASRS Text
Title: EMB 120 MAINTAINING FL180 WITH CLRNC TO DSND 11000 FT PLT'S DISCRETION. FO COPIED ALTIMETER SETTING 30 PT 54. THROUGH THE AUTOPLT CLB BUTTON, FO ATTEMPTED TO CORRECT THE ALT DISCREPANCY. ACFT BEGAN A CLB WHICH HE WAS UNABLE TO STOP BEFORE HE WAS OFF ALT 250 FT HIGH. ADVISED CTR THEY WERE LEAVING FL180 FOR 11000 FT. NOT FAMILIAR WITH THE AUTOPLT SYS.
Narrative: IN CRUISE FLT WITH PLT'S DISCRETION TO 11000 FT, WE WERE GIVEN AN ALTIMETER SETTING OF 30.54. I DIALED IT INTO MY SIDE AND TRIED TO CORRECT THE ALTIMETER DISCREPANCY BY ENGAGING THE CLB BUTTON ON AND OFF. THIS STARTED A CLB THAT WOULDN'T STOP (AS I THOUGHT IT WOULD). I CORRECTED THE CLB (250 FT) BY DISENGAGING THE AUTOPLT AND MANUALLY DSNDING. WE WERE QUERIED BY ATC. WE THEN CALLED OUR DSCNT (PLT'S DISCRETION) TO 11000 FT. NO APPARENT CONFLICT. I BLAME MY LACK OF TOTAL UNDERSTANDING OF THE AUTOPLT SYS AND SLIGHT LOSS OF SITUATIONAL AWARENESS. FATIGUE NOT A FACTOR.
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.