Near midair collision.

Attributes
ACN	292883
Time
Date	199412
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sat
State Reference	TX
Altitude	msl bound lower : 12000 msl bound upper : 12500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : zhu
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Cessna Twin Piston Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 9500
ASRS Report	292883
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 250 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Twin engine cessna (VFR) descended through our altitude causing a near midair collision. Avoidance maneuver was begun using TCASII and completed visually. TCASII was a great aid in avoiding the collision. However, the aural function caused difficulty in communicating with ATC and the sun was 'bleaching out' the presentation on the radar scope.

Original NASA ASRS Text

Title: NMAC.

Narrative: TWIN ENG CESSNA (VFR) DSNDED THROUGH OUR ALT CAUSING A NEAR MIDAIR COLLISION. AVOIDANCE MANEUVER WAS BEGUN USING TCASII AND COMPLETED VISUALLY. TCASII WAS A GREAT AID IN AVOIDING THE COLLISION. HOWEVER, THE AURAL FUNCTION CAUSED DIFFICULTY IN COMMUNICATING WITH ATC AND THE SUN WAS 'BLEACHING OUT' THE PRESENTATION ON THE RADAR SCOPE.

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.