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Flight crew of an airbus A320 undershot descent altitude due to the aircraft's FMC powering up too soon during leveloff to meet the altitude crossing restr on a STAR arrival.
| Attributes | |
| ACN | 465330 |
| Time | |
| Date | 200003 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | PA |
| Altitude | msl bound lower : 19000 msl bound upper : 19400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : milton 3 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 10500 flight time type : 1550 |
| ASRS Report | 465330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : altimeter other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : overrode automation |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Inbound to lga on STAR, we were 300-400 ft high at marrc crossing restr of 19000 ft. The FMS increased power too soon, ballooning us just prior to the fix. I disconnected the autoplt. But still couldn't be exactly at 19000 ft but got almost to 19300 ft by marrc.
Original NASA ASRS Text
Title: FLC OF AN AIRBUS A320 UNDERSHOT DSCNT ALT DUE TO THE ACFT'S FMC POWERING UP TOO SOON DURING LEVELOFF TO MEET THE ALT XING RESTR ON A STAR ARR.
Narrative: INBOUND TO LGA ON STAR, WE WERE 300-400 FT HIGH AT MARRC XING RESTR OF 19000 FT. THE FMS INCREASED PWR TOO SOON, BALLOONING US JUST PRIOR TO THE FIX. I DISCONNECTED THE AUTOPLT. BUT STILL COULDN'T BE EXACTLY AT 19000 FT BUT GOT ALMOST TO 19300 FT BY MARRC.
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.