Near midair collision between an medium large transport and spn in proximity of TCA.

Attributes
ACN	252082
Time
Date	199309
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iad tower : rno
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise 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
Route In Use	enroute : direct
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 6500 flight time type : 2000
ASRS Report	252082
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Publication	Unspecified

Narrative:

We were eastbound, level at 4000 ft, being vectored for approach to iad. In an instant we saw a glider at 12 O'clock just below us heading northeast. The captain took evasive action climbing, otherwise we might have collided. We passed about 100 ft above and behind him. He didn't see us (he made no turns or maneuvers) and the sky was a little hazy. We were TCASII equipped but got no advisory (no transponder on glider). We advised ATC after conflict was clear.

Original NASA ASRS Text

Title: NMAC BTWN AN MLG AND SPN IN PROX OF TCA.

Narrative: WE WERE EBOUND, LEVEL AT 4000 FT, BEING VECTORED FOR APCH TO IAD. IN AN INSTANT WE SAW A GLIDER AT 12 O'CLOCK JUST BELOW US HDG NE. THE CAPT TOOK EVASIVE ACTION CLBING, OTHERWISE WE MIGHT HAVE COLLIDED. WE PASSED ABOUT 100 FT ABOVE AND BEHIND HIM. HE DIDN'T SEE US (HE MADE NO TURNS OR MANEUVERS) AND THE SKY WAS A LITTLE HAZY. WE WERE TCASII EQUIPPED BUT GOT NO ADVISORY (NO XPONDER ON GLIDER). WE ADVISED ATC AFTER CONFLICT WAS CLR.

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.