Near midair collision or airborne conflict between air carrier medium large transport and unknown po...

Attributes
ACN	139253
Time
Date	199003
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	msl bound lower : 6200 msl bound upper : 7400
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mkg
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid enroute airway : ont
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 1200
ASRS Report	139253
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : nmac non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 500 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While about 5500' to 5800' MSL, departure control called 'mode C 1 1/2 mi 11:30 popup, altitude 6200'. Climb immediately'. We were at 210 KTS, 1.65 EPR, climbing to 7000' on the prado 2 SID from ont. I was first officer flying, I stood up the thrust levers, called set go around thrust, and pulled back. While we were doing this, ATC called traffic Y 6400' closing. I kept the aircraft at maximum climb to our altitude clearance of 7000', and hit 7400' on level off to get above a broken cloud layer 6400-7200'. We leveled on top, ATC said to maintain 7300' since we broke 7000'. Note: we had FAA ATC ZFW controller on jumpseat, he told us that ATC is seeing more traffic not using mode C so they can penetrate controled airspace, and that it was common to see this sudden mode C appearance when a traffic conflict comes up.

Original NASA ASRS Text

Title: NMAC OR AIRBORNE CONFLICT BETWEEN ACR MLG AND UNKNOWN POPUP TRAFFIC NEAR ONT.

Narrative: WHILE ABOUT 5500' TO 5800' MSL, DEP CTL CALLED 'MODE C 1 1/2 MI 11:30 POPUP, ALT 6200'. CLB IMMEDIATELY'. WE WERE AT 210 KTS, 1.65 EPR, CLBING TO 7000' ON THE PRADO 2 SID FROM ONT. I WAS F/O FLYING, I STOOD UP THE THRUST LEVERS, CALLED SET GO AROUND THRUST, AND PULLED BACK. WHILE WE WERE DOING THIS, ATC CALLED TFC Y 6400' CLOSING. I KEPT THE ACFT AT MAX CLB TO OUR ALT CLRNC OF 7000', AND HIT 7400' ON LEVEL OFF TO GET ABOVE A BROKEN CLOUD LAYER 6400-7200'. WE LEVELED ON TOP, ATC SAID TO MAINTAIN 7300' SINCE WE BROKE 7000'. NOTE: WE HAD FAA ATC ZFW CTLR ON JUMPSEAT, HE TOLD US THAT ATC IS SEEING MORE TFC NOT USING MODE C SO THEY CAN PENETRATE CTLED AIRSPACE, AND THAT IT WAS COMMON TO SEE THIS SUDDEN MODE C APPEARANCE WHEN A TFC CONFLICT COMES UP.

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.

Near midair collision or airborne conflict between air carrier medium large transport and unknown popup traffic near ont.