Close proximity air carrier-large transport unk VFR traffic over las.

Attributes
ACN	195391
Time
Date	199111
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las
State Reference	NV
Altitude	msl bound lower : 4500 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : las
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other landing : go around
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 7000
ASRS Report	195391
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : commercial pilot : private pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 4000 flight time type : 1000
ASRS Report	195409
Events
Anomaly	altitude deviation : excursion from assigned altitude other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 800 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

While executing a missed approach at las due to winds that exceeded the maximum crosswind limitations of the aircraft, ATC instructed us to fly runway heading and maintain present altitude of 4500 ft. VFR traffic was reported to us at 11 O'clock and 5000 ft. We were told he was maintaining 5000 ft. The traffic started descending across our flight path. I turned left and started a descent to stay clear. TCASII was on and provided an RA to confirm our visual prognosis. 500 ft traffic separation does not seem adequate to provide a good safety net. Fortunately we had a good visual on the VFR traffic and TCASII performed as advertised. Supplemental information from acn 195409: we reported the visual and was told to maintain the visual on the traffic.

Original NASA ASRS Text

Title: CLOSE PROX ACR-LGT UNK VFR TFC OVER LAS.

Narrative: WHILE EXECUTING A MISSED APCH AT LAS DUE TO WINDS THAT EXCEEDED THE MAX XWIND LIMITATIONS OF THE ACFT, ATC INSTRUCTED US TO FLY RWY HDG AND MAINTAIN PRESENT ALT OF 4500 FT. VFR TFC WAS RPTED TO US AT 11 O'CLOCK AND 5000 FT. WE WERE TOLD HE WAS MAINTAINING 5000 FT. THE TFC STARTED DSNDING ACROSS OUR FLT PATH. I TURNED L AND STARTED A DSCNT TO STAY CLR. TCASII WAS ON AND PROVIDED AN RA TO CONFIRM OUR VISUAL PROGNOSIS. 500 FT TFC SEPARATION DOES NOT SEEM ADEQUATE TO PROVIDE A GOOD SAFETY NET. FORTUNATELY WE HAD A GOOD VISUAL ON THE VFR TFC AND TCASII PERFORMED AS ADVERTISED. SUPPLEMENTAL INFO FROM ACN 195409: WE RPTED THE VISUAL AND WAS TOLD TO MAINTAIN THE VISUAL ON THE TFC.

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.