<< >> NASA ASRS Report 397200, March 1998

TRACON controller assigns 5000 ft to separate B737 from tracked aircraft at 5500 ft. When clear of traffic, controller turns and climbs B737. As pilot initiates control instructions, ATC conflict alert activates for traffic less than 1 mi. Controller issues traffic. Pilot sees traffic and reports near midair collision, traffic passing overhead 100 ft.

Attributes
ACN	397200
Time
Date	199803
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : vny airport : bur
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bur tower : roc
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar pilot : instrument
Experience	controller radar : 10 flight time total : 500
ASRS Report	397200
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

B737 was climbing out of bur on a 255 degree heading, stopped at 5000 ft MSL for conflicting VFR traffic at 5500 ft. B737 spotted traffic and was turned to a 320 degree heading and climbed to 8000 ft. As pilot started turning and climbing, conflict alert activated with a VFR target, 12 O'clock, less than 1 mi, opposite direction. I issued a traffic alert. B737 said in sight and that it was a near miss. Pilot reported aircraft was a bonanza, who passed over the B737 by 100 ft. Target was intermittent on my scope, and did not appear until a moment before I issued traffic. Pilot reported the aircraft TCASII did not go off either. Target dropped off my scope again, and I never saw it again.

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Original NASA ASRS Text

Title: TRACON CTLR ASSIGNS 5000 FT TO SEPARATE B737 FROM TRACKED ACFT AT 5500 FT. WHEN CLR OF TFC, CTLR TURNS AND CLBS B737. AS PLT INITIATES CTL INSTRUCTIONS, ATC CONFLICT ALERT ACTIVATES FOR TFC LESS THAN 1 MI. CTLR ISSUES TFC. PLT SEES TFC AND RPTS NMAC, TFC PASSING OVERHEAD 100 FT.

Narrative: B737 WAS CLBING OUT OF BUR ON A 255 DEG HDG, STOPPED AT 5000 FT MSL FOR CONFLICTING VFR TFC AT 5500 FT. B737 SPOTTED TFC AND WAS TURNED TO A 320 DEG HDG AND CLBED TO 8000 FT. AS PLT STARTED TURNING AND CLBING, CONFLICT ALERT ACTIVATED WITH A VFR TARGET, 12 O'CLOCK, LESS THAN 1 MI, OPPOSITE DIRECTION. I ISSUED A TFC ALERT. B737 SAID IN SIGHT AND THAT IT WAS A NEAR MISS. PLT RPTED ACFT WAS A BONANZA, WHO PASSED OVER THE B737 BY 100 FT. TARGET WAS INTERMITTENT ON MY SCOPE, AND DID NOT APPEAR UNTIL A MOMENT BEFORE I ISSUED TFC. PLT RPTED THE ACFT TCASII DID NOT GO OFF EITHER. TARGET DROPPED OFF MY SCOPE AGAIN, AND I NEVER SAW IT AGAIN.

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.