B737-300 crew took evasive action to avoid a cessna while flying on the oasys 2 departing las.

Attributes
ACN	517553
Time
Date	200106
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : l30.tracon
State Reference	NV
Altitude	msl bound lower : 8500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : oasys
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : l30.tracon
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 18000 flight time type : 9000
ASRS Report	517553
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne critical non adherence : published procedure other spatial deviation
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action flight crew : took evasive action
Consequence	other
Miss Distance	horizontal : 1500 vertical : 100
Supplementary
Problem Areas	ATC Human Performance Airspace Structure FAA
Primary Problem	ATC Human Performance

Narrative:

Near midair collision/exceeded 30 degree bank angle. Departing las on OASYS2 departure, near oasys intersection, climbing through 7000 ft for 8000 ft we were given clearance to 15000 ft. Frequency 125.9. Aircraft ahead was at 8500 ft. We saw him descend through 8500 ft to 8100 ft and knew he did not intend (or was cleared to descend) below VFR separation and the controller should not have given us clearance to 15000 ft. We had decided to delay the climb until passed traffic, but now had a lethal conflict. The RA sounded descend, but I elected not to descend into rapidly rising terrain. The cessna was slightly to our right, passing through 100 ft above us, less than 1/4 mi. I elected to break hard left. Using 60 degree bank turn we cleared the traffic.

Original NASA ASRS Text

Title: B737-300 CREW TOOK EVASIVE ACTION TO AVOID A CESSNA WHILE FLYING ON THE OASYS 2 DEPARTING LAS.

Narrative: NMAC/EXCEEDED 30 DEG BANK ANGLE. DEPARTING LAS ON OASYS2 DEP, NEAR OASYS INTXN, CLBING THROUGH 7000 FT FOR 8000 FT WE WERE GIVEN CLRNC TO 15000 FT. FREQ 125.9. ACFT AHEAD WAS AT 8500 FT. WE SAW HIM DSND THROUGH 8500 FT TO 8100 FT AND KNEW HE DID NOT INTEND (OR WAS CLRED TO DSND) BELOW VFR SEPARATION AND THE CTLR SHOULD NOT HAVE GIVEN US CLRNC TO 15000 FT. WE HAD DECIDED TO DELAY THE CLB UNTIL PASSED TFC, BUT NOW HAD A LETHAL CONFLICT. THE RA SOUNDED DSND, BUT I ELECTED NOT TO DSND INTO RAPIDLY RISING TERRAIN. THE CESSNA WAS SLIGHTLY TO OUR R, PASSING THROUGH 100 FT ABOVE US, LESS THAN 1/4 MI. I ELECTED TO BREAK HARD L. USING 60 DEG BANK TURN WE CLRED 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.