B737 and cessna type aircraft near midair collision on approach to mmsd.

Attributes
ACN	574859
Time
Date	200302
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmsd.airport
State Reference	FO
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
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
ASRS Report	574859
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	574860
Events
Anomaly	conflict : airborne critical non adherence : published procedure non adherence : clearance
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Near midair collision with yellow high wing single engine cessna type aircraft. We were established on and cleared for the VOR DME-3 runway 16 at 23 DME and 8000 ft MSL. We followed the TCASII RA instructions to climb. We sighted the cessna as it passed below us approximately 300 ft. Sjd approach and tower were unaware of the VFR cessna flying in the approach corridor.

Original NASA ASRS Text

Title: B737 AND CESSNA TYPE ACFT NMAC ON APCH TO MMSD.

Narrative: NMAC WITH YELLOW HIGH WING SINGLE ENG CESSNA TYPE ACFT. WE WERE ESTABLISHED ON AND CLRED FOR THE VOR DME-3 RWY 16 AT 23 DME AND 8000 FT MSL. WE FOLLOWED THE TCASII RA INSTRUCTIONS TO CLB. WE SIGHTED THE CESSNA AS IT PASSED BELOW US APPROX 300 FT. SJD APCH AND TWR WERE UNAWARE OF THE VFR CESSNA FLYING IN THE APCH CORRIDOR.

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.