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A B737-300 flight crew fails to make their assigned altitude crossing when the VNAV disconnects at start of descent near bwi, md.
| Attributes | |
| ACN | 503210 |
| Time | |
| Date | 200103 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : bal.vortac |
| State Reference | MO |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dca.tracon tracon : rjaa.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 503210 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time total : 5000 |
| ASRS Report | 503211 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight from alb to dca XA00 local time. Cleared to cross bwi at 10000 ft. Pressure controller operation on standby. Set altitude in window. Apparently VNAV disconnected. Realized airplane was not initiating descent. Started down manually. Bwi reclred us to 10000 ft. We were distraction by manually operating pressure control system (on MEL).
Original NASA ASRS Text
Title: A B737-300 FLC FAILS TO MAKE THEIR ASSIGNED ALT XING WHEN THE VNAV DISCONNECTS AT START OF DSCNT NEAR BWI, MD.
Narrative: FLT FROM ALB TO DCA XA00 LCL TIME. CLRED TO CROSS BWI AT 10000 FT. PRESSURE CONTROLLER OP ON STANDBY. SET ALT IN WINDOW. APPARENTLY VNAV DISCONNECTED. REALIZED AIRPLANE WAS NOT INITIATING DSCNT. STARTED DOWN MANUALLY. BWI RECLRED US TO 10000 FT. WE WERE DISTR BY MANUALLY OPERATING PRESSURE CTL SYS (ON MEL).
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.