Small aircraft Y non adherence to ATC clearance unauthorized climb through occupied altitude caused air carrier X TCASII RA evasive action taken pilot deviation.

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Attributes
ACN	282854
Time
Date	199409
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : las
State Reference	NV
Altitude	msl bound lower : 6100 msl bound upper : 6100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las tracon : bru
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 25 controller supervisory : 8
ASRS Report	282854
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Air carrier X MD83/right descending to 6000 ft on downwind to runway 25L. Small aircraft Y, a C172 sebound cleared to 5500 ft, en route to scottsdale, az. I was working moderate traffic at the time of the occurrence air carrier X was handed off to me from the daggett controller. I descended him to 6000 ft. Y was handed off to me by the cyn controller. The scratch pad showed the pilot requesting 7500 ft to scottsdale, az. I advised X he was following traffic and issued the type and position. The pilot advised me he couldn't hear me because the TCASII was 'going off.' at this time there were seven or eight aircraft all passing within 1-3 mi of each other and the partial and full data blocks were overlapping each other. This made it very difficult to see any of them. When the pilot of X advised me of the TCASII alert, Y's altitude showed 6400 ft. I asked him his altitude and he read back 6400 ft climbing. At no time was a climb issued by me to the pilot of Y. The aircraft came within 1 mi and 500 ft of each other.

Original NASA ASRS Text

Title: SMA Y NON ADHERENCE TO ATC CLRNC UNAUTH CLB THROUGH OCCUPIED ALT CAUSED ACR X TCASII RA EVASIVE ACTION TAKEN PLTDEV.

Narrative: ACR X MD83/R DSNDING TO 6000 FT ON DOWNWIND TO RWY 25L. SMA Y, A C172 SEBOUND CLRED TO 5500 FT, ENRTE TO SCOTTSDALE, AZ. I WAS WORKING MODERATE TFC AT THE TIME OF THE OCCURRENCE ACR X WAS HANDED OFF TO ME FROM THE DAGGETT CTLR. I DSNDED HIM TO 6000 FT. Y WAS HANDED OFF TO ME BY THE CYN CTLR. THE SCRATCH PAD SHOWED THE PLT REQUESTING 7500 FT TO SCOTTSDALE, AZ. I ADVISED X HE WAS FOLLOWING TFC AND ISSUED THE TYPE AND POS. THE PLT ADVISED ME HE COULDN'T HEAR ME BECAUSE THE TCASII WAS 'GOING OFF.' AT THIS TIME THERE WERE SEVEN OR EIGHT ACFT ALL PASSING WITHIN 1-3 MI OF EACH OTHER AND THE PARTIAL AND FULL DATA BLOCKS WERE OVERLAPPING EACH OTHER. THIS MADE IT VERY DIFFICULT TO SEE ANY OF THEM. WHEN THE PLT OF X ADVISED ME OF THE TCASII ALERT, Y'S ALT SHOWED 6400 FT. I ASKED HIM HIS ALT AND HE READ BACK 6400 FT CLBING. AT NO TIME WAS A CLB ISSUED BY ME TO THE PLT OF Y. THE ACFT CAME WITHIN 1 MI AND 500 FT OF EACH OTHER.

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.