Narrative:

Climbing out of ont on the pomona 6 departure at approximately 4500 ft TCAS gave traffic advisory, followed by traffic alert by departure control, followed by a resolution advisory from TCAS to descend. Almost simultaneously ont departure told us to continue climb immediately. I determined the best course of action was to descend per TCAS which indicated traffic was still slightly above us at 12 O'clock and closing rapidly. After clear of traffic, which we never made contact with visually, we continued climb on the pomona 6 and informed ont departure the reason for not climbing immediately as they had instructed. When climbing through approximately 8000 ft we received another traffic advisory from TCAS followed by a level off resolution from TCAS followed by a level off resolution from TCAS. We observed a light aircraft pass right to left a few hundred ft above us. After our 2 level-offs and 1 descent we barely made the 14000 ft crossing restriction at bucck which might have created other traffic problems. We advised los angeles center we would have trouble working the bucck restriction and they wanted to know why they hadn't been informed earlier. We had been so busy avoiding traffic, that was our first opportunity to advise los angeles center. In my opinion the area immediately west and northwest of ont is very hazardous. In the past I have had other traffic alerts in this area quite frequently, the problem is compounded by high mountains to the north, the lax TCA, and the ont arsa forcing VFR aircraft into a very small area. VFR aircraft flying just above the 5000 ft ont arsa ceiling and flying near the pom VOR 294 degree radial will be in great danger of traffic conflicts with the every few min departures of air carrier jets. Some sort of warning of this problem on the lax area chart, or a bulletin would probably help a great deal.

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Original NASA ASRS Text

Title: ACR FOLLOWS TCASII RA. DSNDS.

Narrative: CLBING OUT OF ONT ON THE POMONA 6 DEP AT APPROX 4500 FT TCAS GAVE TFC ADVISORY, FOLLOWED BY TFC ALERT BY DEP CTL, FOLLOWED BY A RESOLUTION ADVISORY FROM TCAS TO DSND. ALMOST SIMULTANEOUSLY ONT DEP TOLD US TO CONTINUE CLB IMMEDIATELY. I DETERMINED THE BEST COURSE OF ACTION WAS TO DSND PER TCAS WHICH INDICATED TFC WAS STILL SLIGHTLY ABOVE US AT 12 O'CLOCK AND CLOSING RAPIDLY. AFTER CLR OF TFC, WHICH WE NEVER MADE CONTACT WITH VISUALLY, WE CONTINUED CLB ON THE POMONA 6 AND INFORMED ONT DEP THE REASON FOR NOT CLBING IMMEDIATELY AS THEY HAD INSTRUCTED. WHEN CLBING THROUGH APPROX 8000 FT WE RECEIVED ANOTHER TFC ADVISORY FROM TCAS FOLLOWED BY A LEVEL OFF RESOLUTION FROM TCAS FOLLOWED BY A LEVEL OFF RESOLUTION FROM TCAS. WE OBSERVED A LIGHT ACFT PASS R TO L A FEW HUNDRED FT ABOVE US. AFTER OUR 2 LEVEL-OFFS AND 1 DSCNT WE BARELY MADE THE 14000 FT XING RESTRICTION AT BUCCK WHICH MIGHT HAVE CREATED OTHER TFC PROBLEMS. WE ADVISED LOS ANGELES CENTER WE WOULD HAVE TROUBLE WORKING THE BUCCK RESTRICTION AND THEY WANTED TO KNOW WHY THEY HADN'T BEEN INFORMED EARLIER. WE HAD BEEN SO BUSY AVOIDING TFC, THAT WAS OUR FIRST OPPORTUNITY TO ADVISE LOS ANGELES CENTER. IN MY OPINION THE AREA IMMEDIATELY W AND NW OF ONT IS VERY HAZARDOUS. IN THE PAST I HAVE HAD OTHER TFC ALERTS IN THIS AREA QUITE FREQUENTLY, THE PROBLEM IS COMPOUNDED BY HIGH MOUNTAINS TO THE N, THE LAX TCA, AND THE ONT ARSA FORCING VFR ACFT INTO A VERY SMALL AREA. VFR ACFT FLYING JUST ABOVE THE 5000 FT ONT ARSA CEILING AND FLYING NEAR THE POM VOR 294 DEG RADIAL WILL BE IN GREAT DANGER OF TFC CONFLICTS WITH THE EVERY FEW MIN DEPS OF AIR CARRIER JETS. SOME SORT OF WARNING OF THIS PROBLEM ON THE LAX AREA CHART, OR A BULLETIN WOULD PROBABLY HELP A GREAT DEAL.

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.