An EMB120 crew, approaching psp during a radar outage, experienced an near midair collision with a challenger jet. The first officer attributed part of the problem to the size of the TCASII display and its placement on the instrument panel.

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Attributes
ACN	459152
Time
Date	199912
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : psp.airport
State Reference	CA
Altitude	msl single value : 3600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : psp.tower
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach
Route In Use	approach : instrument non precision arrival : vfr
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : psp.tower
Operator	general aviation : corporate
Make Model Name	Challenger Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 15000 flight time type : 6001
ASRS Report	459152
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 275 flight time total : 2600 flight time type : 360
ASRS Report	459611
Events
Anomaly	aircraft equipment problem : less severe conflict : nmac non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 2000 vertical : 200
Supplementary
Problem Areas	ATC Human Performance ATC Facility Flight Crew Human Performance Aircraft
Primary Problem	ATC Facility

Narrative:

Psp was non radar due to outage. We were inbound on the VOR approach about 5 mi inside the VOR, or 15 mi from the airport, descending through 3600 ft. We received a TCASII advisory of 1 O'clock and 1 mi. Descending at 700 FPM within a few seconds, a challenger jet passed to our right about 200 ft above and 1/4 mi. He was in a left turn and appeared to be taking evasive action. TCASII is great. Supplemental information from acn 459611: psp radar was OTS. We were flying a VOR approach in VMC because of this. Bf goodrich TCASII display is too small, on the captain's side instead of centrally located, and blocked by the control yoke. The data needs to be placed on the radar screen like in the other models of TCASII we have!

Original NASA ASRS Text

Title: AN EMB120 CREW, APCHING PSP DURING A RADAR OUTAGE, EXPERIENCED AN NMAC WITH A CHALLENGER JET. THE FO ATTRIBUTED PART OF THE PROB TO THE SIZE OF THE TCASII DISPLAY AND ITS PLACEMENT ON THE INST PANEL.

Narrative: PSP WAS NON RADAR DUE TO OUTAGE. WE WERE INBOUND ON THE VOR APCH ABOUT 5 MI INSIDE THE VOR, OR 15 MI FROM THE ARPT, DSNDING THROUGH 3600 FT. WE RECEIVED A TCASII ADVISORY OF 1 O'CLOCK AND 1 MI. DSNDING AT 700 FPM WITHIN A FEW SECONDS, A CHALLENGER JET PASSED TO OUR R ABOUT 200 FT ABOVE AND 1/4 MI. HE WAS IN A L TURN AND APPEARED TO BE TAKING EVASIVE ACTION. TCASII IS GREAT. SUPPLEMENTAL INFO FROM ACN 459611: PSP RADAR WAS OTS. WE WERE FLYING A VOR APCH IN VMC BECAUSE OF THIS. BF GOODRICH TCASII DISPLAY IS TOO SMALL, ON THE CAPT'S SIDE INSTEAD OF CENTRALLY LOCATED, AND BLOCKED BY THE CTL YOKE. THE DATA NEEDS TO BE PLACED ON THE RADAR SCREEN LIKE IN THE OTHER MODELS OF TCASII WE HAVE!

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.