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Flight crew of an L1011 tristar descended below assigned altitude when the autoplt disconnected while crew were distraction doing other tasks.
| Attributes | |
| ACN | 351690 |
| Time | |
| Date | 199610 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lgw |
| State Reference | FO |
| Altitude | msl bound lower : 18300 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lgw |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | other other : other pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 10000 flight time type : 2100 |
| ASRS Report | 351690 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Autoplt disengaged at FL190. Crew (first officer) was tuning radios and talking to approach control. Captain was reading holding instructions to a new holding pattern obscurely presented on approach page into gatwick, england. Gradual descent 700 ft below before arrested and returned to altitude. This is third such occurrence within a yr on the tristar (L1011).
Original NASA ASRS Text
Title: FLC OF AN L1011 TRISTAR DSNDED BELOW ASSIGNED ALT WHEN THE AUTOPLT DISCONNECTED WHILE CREW WERE DISTR DOING OTHER TASKS.
Narrative: AUTOPLT DISENGAGED AT FL190. CREW (FO) WAS TUNING RADIOS AND TALKING TO APCH CTL. CAPT WAS READING HOLDING INSTRUCTIONS TO A NEW HOLDING PATTERN OBSCURELY PRESENTED ON APCH PAGE INTO GATWICK, ENGLAND. GRADUAL DSCNT 700 FT BELOW BEFORE ARRESTED AND RETURNED TO ALT. THIS IS THIRD SUCH OCCURRENCE WITHIN A YR ON THE TRISTAR (L1011).
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.