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Flight crew of B757 resets FMC when given crossing restr but fails to engage it. Controller reclrs to maintain altitude.
| Attributes | |
| ACN | 382820 |
| Time | |
| Date | 199710 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : otk |
| State Reference | FL |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 45 flight time total : 8000 flight time type : 45 |
| ASRS Report | 382820 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Our original descent altitude in the FMC was set to cross clawz at the expect altitude of FL270. ATC cleared us from FL370 to FL350 prior to otk for traffic. ATC subsequently cleared us to cross clawz at FL310, rather than FL270. With the change of crossing altitudes and other descent duties the new altitude (FL310) was entered into the FMC, but not engaged. We realized the aircraft had not started the descent, but we were too close to clawz. Center called us and reclred us to maintain FL350. Factor: new first officer perception -- thought PNF engaged FMC. Corrective: always confirm automation.
Original NASA ASRS Text
Title: FLC OF B757 RESETS FMC WHEN GIVEN XING RESTR BUT FAILS TO ENGAGE IT. CTLR RECLRS TO MAINTAIN ALT.
Narrative: OUR ORIGINAL DSCNT ALT IN THE FMC WAS SET TO CROSS CLAWZ AT THE EXPECT ALT OF FL270. ATC CLRED US FROM FL370 TO FL350 PRIOR TO OTK FOR TFC. ATC SUBSEQUENTLY CLRED US TO CROSS CLAWZ AT FL310, RATHER THAN FL270. WITH THE CHANGE OF XING ALTS AND OTHER DSCNT DUTIES THE NEW ALT (FL310) WAS ENTERED INTO THE FMC, BUT NOT ENGAGED. WE REALIZED THE ACFT HAD NOT STARTED THE DSCNT, BUT WE WERE TOO CLOSE TO CLAWZ. CTR CALLED US AND RECLRED US TO MAINTAIN FL350. FACTOR: NEW FO PERCEPTION -- THOUGHT PNF ENGAGED FMC. CORRECTIVE: ALWAYS CONFIRM AUTOMATION.
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.