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Flight crew of an large transport undershot descent altitude resulting in not meeting an assigned crossing restr caused by a misprogram of the FMC.
| Attributes | |
| ACN | 320761 |
| Time | |
| Date | 199511 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lan |
| State Reference | MI |
| Altitude | msl bound lower : 23000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob tower : mem |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 14000 flight time type : 300 |
| ASRS Report | 320761 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : undershoot altitude deviation : crossing restriction not met 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:
Air carrier was given a restr to be at FL230 60 west of polar. Altitude was entered on FMC. Then we were given polar restr of 250 KTS at 12000 ft. New inexperienced first officer entered the restr in reverse telling FMC 250 KTS in the altitude space. Thus aircraft which already had been given FL230 60 NM west stopped descending at FL250 thinking polar restr was FL250. No apparent conflict resulted. The old adage is program it once and check it twice!
Original NASA ASRS Text
Title: FLC OF AN LGT UNDERSHOT DSCNT ALT RESULTING IN NOT MEETING AN ASSIGNED XING RESTR CAUSED BY A MISPROGRAM OF THE FMC.
Narrative: ACR WAS GIVEN A RESTR TO BE AT FL230 60 W OF POLAR. ALT WAS ENTERED ON FMC. THEN WE WERE GIVEN POLAR RESTR OF 250 KTS AT 12000 FT. NEW INEXPERIENCED FO ENTERED THE RESTR IN REVERSE TELLING FMC 250 KTS IN THE ALT SPACE. THUS ACFT WHICH ALREADY HAD BEEN GIVEN FL230 60 NM W STOPPED DSNDING AT FL250 THINKING POLAR RESTR WAS FL250. NO APPARENT CONFLICT RESULTED. THE OLD ADAGE IS PROGRAM IT ONCE AND CHK IT TWICE!
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.