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TCAS RA on noise abatement departure at sna assisted flight crew in avoiding potential conflict with small aircraft VFR.
| Attributes | |
| ACN | 174236 |
| Time | |
| Date | 199103 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sna |
| State Reference | CA |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : noise abatement departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| ASRS Report | 174236 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight sna-den deviated from the prescribed course for the sna company noise abatement departure to avoid possible collision with VFR traffic at 2000' MSL approximately 3 mi south of sna. Luckily, departure control and our TCAS alerted us of this traffic. Had we not received these alerts, we would have flown company procedure which would have put us in a very possible collision position. Due to the unusual attitudes required for this procedure and the fact that concentration on aircraft INS is required to perform it, it is highly possible that we would not have obtained visibility contact with this aircraft. Suggestion: if this departure procedure is to be continued, then the noise sensitive area should be prohibited to VFR aircraft.
Original NASA ASRS Text
Title: TCAS RA ON NOISE ABATEMENT DEP AT SNA ASSISTED FLT CREW IN AVOIDING POTENTIAL CONFLICT WITH SMA VFR.
Narrative: FLT SNA-DEN DEVIATED FROM THE PRESCRIBED COURSE FOR THE SNA COMPANY NOISE ABATEMENT DEP TO AVOID POSSIBLE COLLISION WITH VFR TFC AT 2000' MSL APPROX 3 MI S OF SNA. LUCKILY, DEP CTL AND OUR TCAS ALERTED US OF THIS TFC. HAD WE NOT RECEIVED THESE ALERTS, WE WOULD HAVE FLOWN COMPANY PROC WHICH WOULD HAVE PUT US IN A VERY POSSIBLE COLLISION POS. DUE TO THE UNUSUAL ATTITUDES REQUIRED FOR THIS PROC AND THE FACT THAT CONCENTRATION ON ACFT INS IS REQUIRED TO PERFORM IT, IT IS HIGHLY POSSIBLE THAT WE WOULD NOT HAVE OBTAINED VIS CONTACT WITH THIS ACFT. SUGGESTION: IF THIS DEP PROC IS TO BE CONTINUED, THEN THE NOISE SENSITIVE AREA SHOULD BE PROHIBITED TO VFR 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.