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Close proximity between air carrier-large transport on ILS approach and small aircraft crossing final approach course.
| Attributes | |
| ACN | 84933 |
| Time | |
| Date | 198804 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 1000 msl bound upper : 1200 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : oak |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other cruise other descent other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 175 flight time total : 13000 flight time type : 10000 |
| ASRS Report | 84933 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac non adherence : clearance non adherence : far |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 0 vertical : 250 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Event occurred while making instrument approach to oak runway 29L. Aircraft in clouds. Bay approach turned flight over to oak tower approaching OM. Tower did not answer on initial call up. We called second time and tower replied with traffic advisory of 12-1 O'clock and altitude 800-1100' MSL. We broke out of clouds 1100-1200' and copilot saw high-winged small aircraft Y pass below our aircraft approximately 200'. After landing, tower told us that small aircraft Y was disoriented. Whoever was in contact told small aircraft Y to dive. We don't know who this was--approach, tower, etc. Considering proximity of aircraft, we should have been advised to abandon approach and climb immediately. However, we realize that time could have precluded doing this. How does one prevent disoriented pilots in MVFR?
Original NASA ASRS Text
Title: CLOSE PROX BETWEEN ACR-LGT ON ILS APCH AND SMA CROSSING FINAL APCH COURSE.
Narrative: EVENT OCCURRED WHILE MAKING INSTRUMENT APCH TO OAK RWY 29L. ACFT IN CLOUDS. BAY APCH TURNED FLT OVER TO OAK TWR APCHING OM. TWR DID NOT ANSWER ON INITIAL CALL UP. WE CALLED SECOND TIME AND TWR REPLIED WITH TFC ADVISORY OF 12-1 O'CLOCK AND ALT 800-1100' MSL. WE BROKE OUT OF CLOUDS 1100-1200' AND COPLT SAW HIGH-WINGED SMA Y PASS BELOW OUR ACFT APPROX 200'. AFTER LNDG, TWR TOLD US THAT SMA Y WAS DISORIENTED. WHOEVER WAS IN CONTACT TOLD SMA Y TO DIVE. WE DON'T KNOW WHO THIS WAS--APCH, TWR, ETC. CONSIDERING PROX OF ACFT, WE SHOULD HAVE BEEN ADVISED TO ABANDON APCH AND CLB IMMEDIATELY. HOWEVER, WE REALIZE THAT TIME COULD HAVE PRECLUDED DOING THIS. HOW DOES ONE PREVENT DISORIENTED PLTS IN MVFR?
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.