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L101 first officer (PF) inadvertently descended below assigned altitude on STAR. The first officer was trying to select an autoflt function in the pms autothrust mode (captain's side of panel), which would not engage. The IAS mode was selected by mistake.
| Attributes | |
| ACN | 325440 |
| Time | |
| Date | 199601 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : odf |
| State Reference | GA |
| Altitude | msl bound lower : 23600 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star enroute airway : ztl |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 225 flight time total : 20000 flight time type : 2000 |
| ASRS Report | 325440 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 24500 flight time type : 7000 |
| ASRS Report | 325598 |
| 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 other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft on macy arrival to atlanta having been cleared to FL240 due to turbulence and slowed to 280 KTS. I (first officer) entered speed into performance management system (pms) then tried a couple of times to select thrust management on autoflt panel. Inadvertently I selected IAS the third time (both are on the captain's side of panel). While checking position (VOR) aircraft started descending slowly, but was noticed and corrective action taken at approximately 23600 ft. Controller avowed no conflict of traffic and no action taken. Trip terminated in atlanta.
Original NASA ASRS Text
Title: L101 FO (PF) INADVERTENTLY DSNDED BELOW ASSIGNED ALT ON STAR. THE FO WAS TRYING TO SELECT AN AUTOFLT FUNCTION IN THE PMS AUTOTHRUST MODE (CAPT'S SIDE OF PANEL), WHICH WOULD NOT ENGAGE. THE IAS MODE WAS SELECTED BY MISTAKE.
Narrative: ACFT ON MACY ARR TO ATLANTA HAVING BEEN CLRED TO FL240 DUE TO TURB AND SLOWED TO 280 KTS. I (FO) ENTERED SPD INTO PERFORMANCE MGMNT SYS (PMS) THEN TRIED A COUPLE OF TIMES TO SELECT THRUST MGMNT ON AUTOFLT PANEL. INADVERTENTLY I SELECTED IAS THE THIRD TIME (BOTH ARE ON THE CAPT'S SIDE OF PANEL). WHILE CHKING POS (VOR) ACFT STARTED DSNDING SLOWLY, BUT WAS NOTICED AND CORRECTIVE ACTION TAKEN AT APPROX 23600 FT. CTLR AVOWED NO CONFLICT OF TFC AND NO ACTION TAKEN. TRIP TERMINATED IN ATLANTA.
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.