Close proximity air carrier-medium large transport, 2 spn's and a hang glider while on vector approa...

Attributes
ACN	86639
Time
Date	198804
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : oak
State Reference	CA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Sail Plane
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 176 flight time total : 6000 flight time type : 1200
ASRS Report	86639
Person 2
Function	flight crew : first officer
Qualification	pilot : atp
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Please count this as 3 separate near midair collision's. We were on a westerly heading to intercept the oak 29 localizer, level 4000'. I noticed what appeared to be a light aircraft a couple of miles ahead. As I was watching it, I spotted a glider at 11 O'clock, our altitude, close in, same direction. The glider passed off our left, approximately 100-200' away, at our altitude. The copilot kept watching that glider and descended to 3800', when he noticed the glider turn toward us as we passed. I looked ahead to see what happened to the original traffic, which turned out not to be an airplane 2 mi away, but a hang glider a few hundred ft away. It also passed us 100-200' to our left, at our altitude. I looked ahead again and saw a second glider dead ahead, our altitude. I said, 'pull up,' which the copilot did, and we cleared the glider by approximately 100'. Bay approach said they had no radar contact. My suggestion for alleviating these incidents is: require altitude encoders in high density airspace. We are definitely going to have more midair collisions involving airliners until something is done. See and avoid is not acceptable!

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG, 2 SPN'S AND A HANG GLIDER WHILE ON VECTOR APCH FROM OVER OAKLAND HILLS.

Narrative: PLEASE COUNT THIS AS 3 SEPARATE NMAC'S. WE WERE ON A WESTERLY HDG TO INTERCEPT THE OAK 29 LOC, LEVEL 4000'. I NOTICED WHAT APPEARED TO BE A LIGHT ACFT A COUPLE OF MILES AHEAD. AS I WAS WATCHING IT, I SPOTTED A GLIDER AT 11 O'CLOCK, OUR ALT, CLOSE IN, SAME DIRECTION. THE GLIDER PASSED OFF OUR LEFT, APPROX 100-200' AWAY, AT OUR ALT. THE COPLT KEPT WATCHING THAT GLIDER AND DSNDED TO 3800', WHEN HE NOTICED THE GLIDER TURN TOWARD US AS WE PASSED. I LOOKED AHEAD TO SEE WHAT HAPPENED TO THE ORIGINAL TFC, WHICH TURNED OUT NOT TO BE AN AIRPLANE 2 MI AWAY, BUT A HANG GLIDER A FEW HUNDRED FT AWAY. IT ALSO PASSED US 100-200' TO OUR LEFT, AT OUR ALT. I LOOKED AHEAD AGAIN AND SAW A SECOND GLIDER DEAD AHEAD, OUR ALT. I SAID, 'PULL UP,' WHICH THE COPLT DID, AND WE CLRED THE GLIDER BY APPROX 100'. BAY APCH SAID THEY HAD NO RADAR CONTACT. MY SUGGESTION FOR ALLEVIATING THESE INCIDENTS IS: REQUIRE ALT ENCODERS IN HIGH DENSITY AIRSPACE. WE ARE DEFINITELY GOING TO HAVE MORE MIDAIR COLLISIONS INVOLVING AIRLINERS UNTIL SOMETHING IS DONE. SEE AND AVOID IS NOT ACCEPTABLE!

Data retrieved from NASA's ASRS site as of August 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.

Close proximity air carrier-medium large transport, 2 spn's and a hang glider while on vector approach from over oakland hills.