Medium large transport given traffic information on small transport, aircraft sighted and medium large transport volunteered to maintain visual separation and had near midair collision with small transport.

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Attributes
ACN	84488
Time
Date	198803
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : trm airport : ont
State Reference	CA
Altitude	msl bound lower : 13000 msl bound upper : 13400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid enroute : on vectors enroute airway : zla
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport
Flight Phase	cruise other descent other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other pilot : cfi pilot : atp
Experience	flight time last 90 days : 220 flight time total : 12000 flight time type : 3000
ASRS Report	84488
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 400
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Although we were on the thermal transition, ZLA center had given us a heading of '080 degrees thermal, when able.' as we were climbing through 13400' MSL (FL230) assigned), center told us to maintain 13000'. First officer was flying and was able to stop the climb at approximately 13500'. Center called traffic at 12 O'clock, an small transport Y. We saw the traffic and told center we would maintain visual. The best action at that point was to pass behind the small transport Y, however, at that moment 2 jumpers left the aircraft. I took control of our aircraft (medium large transport X) and started a right climbing turn to avoid the small transport Y. The small transport Y started a steep descent as soon as the second jumper left the aircraft. We passed over the small transport Y by approximately 400' maximum. Had we been at 13000', there is a very good possibility we would have hit one of the jumpers. The fact that center was so late with their advisory saved the day. Question: why do we allow sky divers to drop on major jet departure routes?

Original NASA ASRS Text

Title: MLG GIVEN TRAFFIC INFORMATION ON SMT, ACFT SIGHTED AND MLG VOLUNTEERED TO MAINTAIN VISUAL SEPARATION AND HAD NMAC WITH SMT.

Narrative: ALTHOUGH WE WERE ON THE THERMAL TRANSITION, ZLA CENTER HAD GIVEN US A HDG OF '080 DEGS THERMAL, WHEN ABLE.' AS WE WERE CLBING THROUGH 13400' MSL (FL230) ASSIGNED), CENTER TOLD US TO MAINTAIN 13000'. F/O WAS FLYING AND WAS ABLE TO STOP THE CLB AT APPROX 13500'. CENTER CALLED TFC AT 12 O'CLOCK, AN SMT Y. WE SAW THE TFC AND TOLD CENTER WE WOULD MAINTAIN VISUAL. THE BEST ACTION AT THAT POINT WAS TO PASS BEHIND THE SMT Y, HOWEVER, AT THAT MOMENT 2 JUMPERS LEFT THE ACFT. I TOOK CTL OF OUR ACFT (MLG X) AND STARTED A RIGHT CLBING TURN TO AVOID THE SMT Y. THE SMT Y STARTED A STEEP DSCNT AS SOON AS THE SECOND JUMPER LEFT THE ACFT. WE PASSED OVER THE SMT Y BY APPROX 400' MAX. HAD WE BEEN AT 13000', THERE IS A VERY GOOD POSSIBILITY WE WOULD HAVE HIT ONE OF THE JUMPERS. THE FACT THAT CENTER WAS SO LATE WITH THEIR ADVISORY SAVED THE DAY. QUESTION: WHY DO WE ALLOW SKY DIVERS TO DROP ON MAJOR JET DEP ROUTES?

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.