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A descending A300 cargo flight fails to make an altitude crossing restr when the FMC does not perform as expected by the crew 10 mi east of hli, ms.
| Attributes | |
| ACN | 472180 |
| Time | |
| Date | 200005 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | MS |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc tower : ind.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : ns |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 60 flight time total : 13000 flight time type : 2200 |
| ASRS Report | 472180 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued advisory none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were cleared to cross 10 NM east of hli at 12000 ft. The aircraft was being flown with autoplt engaged and FMS/IRU navigation. All FMS and navigation inputs for the arrival and descent were correctly input. Passing approximately FL200 we realized that although FMS indications were normal, the descent rate would not accomplish the crossing restr. The maximum rate of descent was established with the engines at idle and speed brakes extended. Initially I felt we could make the restr, but passing approximately 16000 ft realized we could not. ATC asked us at that time if we would be able to comply, and we responded in the negative. No instructions were received from them. We passed over the assigned point approximately 1000 ft above it, and leveled 2 NM beyond it. The cause of the problem was a failure to continually monitor the automated system.
Original NASA ASRS Text
Title: A DSNDING A300 CARGO FLT FAILS TO MAKE AN ALT XING RESTR WHEN THE FMC DOES NOT PERFORM AS EXPECTED BY THE CREW 10 MI E OF HLI, MS.
Narrative: WE WERE CLRED TO CROSS 10 NM E OF HLI AT 12000 FT. THE ACFT WAS BEING FLOWN WITH AUTOPLT ENGAGED AND FMS/IRU NAV. ALL FMS AND NAV INPUTS FOR THE ARR AND DSCNT WERE CORRECTLY INPUT. PASSING APPROX FL200 WE REALIZED THAT ALTHOUGH FMS INDICATIONS WERE NORMAL, THE DSCNT RATE WOULD NOT ACCOMPLISH THE XING RESTR. THE MAX RATE OF DSCNT WAS ESTABLISHED WITH THE ENGS AT IDLE AND SPD BRAKES EXTENDED. INITIALLY I FELT WE COULD MAKE THE RESTR, BUT PASSING APPROX 16000 FT REALIZED WE COULD NOT. ATC ASKED US AT THAT TIME IF WE WOULD BE ABLE TO COMPLY, AND WE RESPONDED IN THE NEGATIVE. NO INSTRUCTIONS WERE RECEIVED FROM THEM. WE PASSED OVER THE ASSIGNED POINT APPROX 1000 FT ABOVE IT, AND LEVELED 2 NM BEYOND IT. THE CAUSE OF THE PROB WAS A FAILURE TO CONTINUALLY MONITOR THE AUTOMATED SYS.
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.