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Descent is started too late to make a crossing restr on arrival to iad. ARTCC radar controller issues a subsequent clearance to a lower altitude without restr resolving the problem.
| Attributes | |
| ACN | 524940 |
| Time | |
| Date | 200101 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : fak.vortac |
| State Reference | VA |
| Altitude | msl bound lower : 22000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : flight engineer pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 1500 |
| ASRS Report | 524940 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : clearance |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We were leveled at FL250 after a descent from FL330 when ZDC issued a clearance to cross fak at FL220. We programmed the autoplt to make the restr and the display showed a descent point 20-30 mi in front of us. We began to discuss the approach and landing in dulles airport as well as our security concerns there. Apparently at some point the autoplt came out of the VNAV mode and failed to begin descent in a timely manner. The captain, PF, began to descend but too late to make the crossing comfortably. Prior to reaching fak center issued a clearance to descend to 13000 ft. There was no conflict with any other aircraft.
Original NASA ASRS Text
Title: DSCNT IS STARTED TOO LATE TO MAKE A XING RESTR ON ARR TO IAD. ARTCC RADAR CTLR ISSUES A SUBSEQUENT CLRNC TO A LOWER ALT WITHOUT RESTR RESOLVING THE PROB.
Narrative: WE WERE LEVELED AT FL250 AFTER A DSCNT FROM FL330 WHEN ZDC ISSUED A CLRNC TO CROSS FAK AT FL220. WE PROGRAMMED THE AUTOPLT TO MAKE THE RESTR AND THE DISPLAY SHOWED A DSCNT POINT 20-30 MI IN FRONT OF US. WE BEGAN TO DISCUSS THE APCH AND LNDG IN DULLES ARPT AS WELL AS OUR SECURITY CONCERNS THERE. APPARENTLY AT SOME POINT THE AUTOPLT CAME OUT OF THE VNAV MODE AND FAILED TO BEGIN DSCNT IN A TIMELY MANNER. THE CAPT, PF, BEGAN TO DSND BUT TOO LATE TO MAKE THE XING COMFORTABLY. PRIOR TO REACHING FAK CTR ISSUED A CLRNC TO DSND TO 13000 FT. THERE WAS NO CONFLICT WITH ANY OTHER ACFT.
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.