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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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The PF (first officer) was researching in his flight bag for the appropriate slc arrival charts. The captain (PNF) was getting the ATIS. No one was watching the autoplt descend 500 ft. The first officer saw the deviation occurring, disconnected the autoplt and returned the aircraft to the assigned FL220. No mention was made of a controller comment.
| Attributes | |
| ACN | 329740 |
| Time | |
| Date | 199603 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zlc |
| State Reference | UT |
| Altitude | msl bound lower : 21500 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc tracon : mia |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 10000 flight time type : 1200 |
| ASRS Report | 329740 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 8000 flight time type : 3000 |
| ASRS Report | 329912 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft at cruise 'B' autoplt on, LNAV on, VNAV on, copilot flying. Captain copying ATIS, copilot looking into flight kit for plates. Autoplt lost approximately 400-500 ft. First officer brought aircraft back to 22000 ft. This could have been prevented if at least one pilot was monitoring the autoplt at all times.
Original NASA ASRS Text
Title: THE PF (FO) WAS RESEARCHING IN HIS FLT BAG FOR THE APPROPRIATE SLC ARR CHARTS. THE CAPT (PNF) WAS GETTING THE ATIS. NO ONE WAS WATCHING THE AUTOPLT DSND 500 FT. THE FO SAW THE DEV OCCURRING, DISCONNECTED THE AUTOPLT AND RETURNED THE ACFT TO THE ASSIGNED FL220. NO MENTION WAS MADE OF A CTLR COMMENT.
Narrative: ACFT AT CRUISE 'B' AUTOPLT ON, LNAV ON, VNAV ON, COPLT FLYING. CAPT COPYING ATIS, COPLT LOOKING INTO FLT KIT FOR PLATES. AUTOPLT LOST APPROX 400-500 FT. FO BROUGHT ACFT BACK TO 22000 FT. THIS COULD HAVE BEEN PREVENTED IF AT LEAST ONE PLT WAS MONITORING THE AUTOPLT AT ALL TIMES.
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.