A glider in the vicinity of N25, experienced an near midair collision with a B737.

Attributes
ACN	487648
Time
Date	200009
Day	Sat
Local Time Of Day	1201 To 1800
Place
State Reference	NY
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : btv.tracon tower : zzz.tower
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level descent : approach
Route In Use	arrival : vfr
Flight Plan	None
Aircraft 2
Controlling Facilities	tracon : btv.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 46 flight time total : 2572 flight time type : 1435
ASRS Report	487648
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : published procedure
Independent Detector	other flight crewa other other : 1
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I spent over 1 hour climbing in weak mountain wave, from 2900-9800 ft MSL, 5 mi west of westport, ny. I then commenced a straight final glide at 55 KIAS (85 KTS ground speed) to 0b7 airport. As I was crossing lake champlain, I began monitoring 121.1 MHZ. Near vergennes, a B737 passed directly under my glider, giving me a clear view of both cockpit windows and engines, but no view of the wingtips due to excessive proximity. I saw this aircraft for less than 2 seconds before it passed. As the B737 passed under, I heard no engine noise. I heard the boeing crew report the miss to burlington approach, who replied that it was painting no gliders in the vicinity, although their radar showed numerous gliders near 0b7, to the east of the ridge, running from camel's hump to mt lincoln.

Original NASA ASRS Text

Title: A GLIDER IN THE VICINITY OF N25, EXPERIENCED AN NMAC WITH A B737.

Narrative: I SPENT OVER 1 HR CLBING IN WEAK MOUNTAIN WAVE, FROM 2900-9800 FT MSL, 5 MI W OF WESTPORT, NY. I THEN COMMENCED A STRAIGHT FINAL GLIDE AT 55 KIAS (85 KTS GND SPD) TO 0B7 ARPT. AS I WAS XING LAKE CHAMPLAIN, I BEGAN MONITORING 121.1 MHZ. NEAR VERGENNES, A B737 PASSED DIRECTLY UNDER MY GLIDER, GIVING ME A CLR VIEW OF BOTH COCKPIT WINDOWS AND ENGS, BUT NO VIEW OF THE WINGTIPS DUE TO EXCESSIVE PROX. I SAW THIS ACFT FOR LESS THAN 2 SECONDS BEFORE IT PASSED. AS THE B737 PASSED UNDER, I HEARD NO ENG NOISE. I HEARD THE BOEING CREW RPT THE MISS TO BURLINGTON APCH, WHO REPLIED THAT IT WAS PAINTING NO GLIDERS IN THE VICINITY, ALTHOUGH THEIR RADAR SHOWED NUMEROUS GLIDERS NEAR 0B7, TO THE E OF THE RIDGE, RUNNING FROM CAMEL'S HUMP TO MT LINCOLN.

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.