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Large transport saw an small transport in close proximity as he descended through 9500'. No traffic advisory from approach control.
| Attributes | |
| ACN | 91969 |
| Time | |
| Date | 198808 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bwi |
| State Reference | MD |
| Altitude | msl bound lower : 9500 msl bound upper : 9500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad tower : mdw |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport |
| Flight Phase | descent other |
| Route In Use | enroute airway : iad enroute airway : zdc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 14000 |
| ASRS Report | 91969 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Dulles approach control failed to issue VFR traffic to descending large transport X crew when spotted the small transport. Small transport Y was swbnd at 9500', the large transport X was descending through 9500' from 15000 to 9000' as per clearance. No evasive action was taken because by the time we saw the small transport Y it was too late to do anything (300-, 500'). It is common practice for ATC to make us descend to 9000' 70-80 mi west of bwi. I see no need to get below 10000' that far out. If approach would only tell us about the traffic they see on radar! This small transport Y had his transponder on and was replying altitude.
Original NASA ASRS Text
Title: LGT SAW AN SMT IN CLOSE PROX AS HE DESCENDED THROUGH 9500'. NO TRAFFIC ADVISORY FROM APCH CTL.
Narrative: DULLES APCH CTL FAILED TO ISSUE VFR TFC TO DSNDING LGT X CREW WHEN SPOTTED THE SMT. SMT Y WAS SWBND AT 9500', THE LGT X WAS DSNDING THROUGH 9500' FROM 15000 TO 9000' AS PER CLRNC. NO EVASIVE ACTION WAS TAKEN BECAUSE BY THE TIME WE SAW THE SMT Y IT WAS TOO LATE TO DO ANYTHING (300-, 500'). IT IS COMMON PRACTICE FOR ATC TO MAKE US DSND TO 9000' 70-80 MI W OF BWI. I SEE NO NEED TO GET BELOW 10000' THAT FAR OUT. IF APCH WOULD ONLY TELL US ABOUT THE TFC THEY SEE ON RADAR! THIS SMT Y HAD HIS TRANSPONDER ON AND WAS REPLYING ALT.
Data retrieved from NASA's ASRS site as of August 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.