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A B737-800 captain blamed the FMC and autoplt for a flap overspd condition and failure to meet a crossing restr, while descending in ZNY airspace.
| Attributes | |
| ACN | 517620 |
| Time | |
| Date | 200107 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : har.vortac |
| State Reference | PA |
| Altitude | msl bound lower : 25000 msl bound upper : 30000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : t75.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 245 |
| ASRS Report | 517620 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : company policies non adherence : published procedure non adherence other other anomaly |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : overrode automation |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Was given descent to cross 40 mi west of harrisburg VOR at 25000 ft. Started a VNAV descent 20 mi prior to FMC top of descent point. At approximately 30000 ft the FMC and autoplt allowed the aircraft to enter an overspd condition at which point I changed to level change and bugged a speed below the red zipper range on the B737-800. At this point ATC cleared the aircraft direct lancaster and handed us off to ZNY. I put lancaster in the computer and copilot called center. Center asked if we had a crossing restr which, during the autoflt problem, we had missed. No conflict of traffic occurred. After landing maintenance was advised of the momentary overspd occurrence.
Original NASA ASRS Text
Title: A B737-800 CAPT BLAMED THE FMC AND AUTOPLT FOR A FLAP OVERSPD CONDITION AND FAILURE TO MEET A XING RESTR, WHILE DSNDING IN ZNY AIRSPACE.
Narrative: WAS GIVEN DSCNT TO CROSS 40 MI W OF HARRISBURG VOR AT 25000 FT. STARTED A VNAV DSCNT 20 MI PRIOR TO FMC TOP OF DSCNT POINT. AT APPROX 30000 FT THE FMC AND AUTOPLT ALLOWED THE ACFT TO ENTER AN OVERSPD CONDITION AT WHICH POINT I CHANGED TO LEVEL CHANGE AND BUGGED A SPD BELOW THE RED ZIPPER RANGE ON THE B737-800. AT THIS POINT ATC CLRED THE ACFT DIRECT LANCASTER AND HANDED US OFF TO ZNY. I PUT LANCASTER IN THE COMPUTER AND COPLT CALLED CTR. CTR ASKED IF WE HAD A XING RESTR WHICH, DURING THE AUTOFLT PROB, WE HAD MISSED. NO CONFLICT OF TFC OCCURRED. AFTER LNDG MAINT WAS ADVISED OF THE MOMENTARY OVERSPD OCCURRENCE.
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.