Near midair collision on descent to destination airport. Remaining below TCA and arsa.

Attributes
ACN	191184
Time
Date	199110
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hwd
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak tracon : dtw
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	descent other
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 30
ASRS Report	191184
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 35 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

On descent to hayward airport encountered a near miss. I had contacted the tower at san ramon for landing clearance and entered the veil area that circles the east bay area on a heading of about 210. Another small aircraft passing from my right to left and slightly above came within 25-50 of collision. I made evasive action down. I do not believe other blue/white small aircraft saw me as he took no action. We were beyond the hayward air traffic area, but they have no radar capabilities from oakland/bay approach. I believe there is too much congestion at this point because it is a low spot in the hills, and it is necessary to descend quickly to get below the oakland arsa. The oakland arsa is causing congestion at low altitude and at limited initial approach fixes, i.e., san ramon and sunol.

Original NASA ASRS Text

Title: NMAC ON DSCNT TO DEST ARPT. REMAINING BELOW TCA AND ARSA.

Narrative: ON DSCNT TO HAYWARD ARPT ENCOUNTERED A NEAR MISS. I HAD CONTACTED THE TWR AT SAN RAMON FOR LNDG CLRNC AND ENTERED THE VEIL AREA THAT CIRCLES THE E BAY AREA ON A HDG OF ABOUT 210. ANOTHER SMA PASSING FROM MY R TO L AND SLIGHTLY ABOVE CAME WITHIN 25-50 OF COLLISION. I MADE EVASIVE ACTION DOWN. I DO NOT BELIEVE OTHER BLUE/WHITE SMA SAW ME AS HE TOOK NO ACTION. WE WERE BEYOND THE HAYWARD ATA, BUT THEY HAVE NO RADAR CAPABILITIES FROM OAKLAND/BAY APCH. I BELIEVE THERE IS TOO MUCH CONGESTION AT THIS POINT BECAUSE IT IS A LOW SPOT IN THE HILLS, AND IT IS NECESSARY TO DSND QUICKLY TO GET BELOW THE OAKLAND ARSA. THE OAKLAND ARSA IS CAUSING CONGESTION AT LOW ALT AND AT LIMITED INITIAL APCH FIXES, I.E., SAN RAMON AND SUNOL.

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.