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The flight crew of a B737-300 experienced an near midair collision with a cessna while on a vector for an approach in class B airspace. The flight crew reported the conflict to ATC, then thought that they were cleared for a visual approach when ATC asked if they could make the left runway. The flight crew had responded that they could make the right runway, but when they were on the visual approach, ATC queried their position.
| Attributes | |
| ACN | 324653 |
| Time | |
| Date | 199512 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iad |
| State Reference | VA |
| Altitude | msl bound lower : 4200 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Cessna Single Piston Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 800 |
| ASRS Report | 324653 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 400 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approximately 30 mi out of iad and given heading to intercept localizer, then given clearance to 2000 ft and maintain 220 KTS. At 5500 ft MSL told to level at 5000 ft with a traffic call. We spotted the traffic and reported. ATC asked if we could make runway 1L, then we advised we could make runway 1R. We then told the controller we had come within 400 ft of traffic according to TCASII. It was assumed that we were cleared for the approach because the controller asked if we could make the runway and we had visual clearance with the traffic, which was now behind us. We continued to descend because the controller said 'ok.' at 4200 ft he asked 'where are you going?' he said we were not cleared for the visual approach. As first officer, I asked if we were now cleared for the visual approach. The controller said yes. We landed with no further incidents.
Original NASA ASRS Text
Title: THE FLC OF A B737-300 EXPERIENCED AN NMAC WITH A CESSNA WHILE ON A VECTOR FOR AN APCH IN CLASS B AIRSPACE. THE FLC RPTED THE CONFLICT TO ATC, THEN THOUGHT THAT THEY WERE CLRED FOR A VISUAL APCH WHEN ATC ASKED IF THEY COULD MAKE THE L RWY. THE FLC HAD RESPONDED THAT THEY COULD MAKE THE R RWY, BUT WHEN THEY WERE ON THE VISUAL APCH, ATC QUERIED THEIR POS.
Narrative: APPROX 30 MI OUT OF IAD AND GIVEN HDG TO INTERCEPT LOC, THEN GIVEN CLRNC TO 2000 FT AND MAINTAIN 220 KTS. AT 5500 FT MSL TOLD TO LEVEL AT 5000 FT WITH A TFC CALL. WE SPOTTED THE TFC AND RPTED. ATC ASKED IF WE COULD MAKE RWY 1L, THEN WE ADVISED WE COULD MAKE RWY 1R. WE THEN TOLD THE CTLR WE HAD COME WITHIN 400 FT OF TFC ACCORDING TO TCASII. IT WAS ASSUMED THAT WE WERE CLRED FOR THE APCH BECAUSE THE CTLR ASKED IF WE COULD MAKE THE RWY AND WE HAD VISUAL CLRNC WITH THE TFC, WHICH WAS NOW BEHIND US. WE CONTINUED TO DSND BECAUSE THE CTLR SAID 'OK.' AT 4200 FT HE ASKED 'WHERE ARE YOU GOING?' HE SAID WE WERE NOT CLRED FOR THE VISUAL APCH. AS FO, I ASKED IF WE WERE NOW CLRED FOR THE VISUAL APCH. THE CTLR SAID YES. WE LANDED WITH NO FURTHER INCIDENTS.
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.