Sailplane and aerostar experience near midair collision.

Attributes
ACN	762533
Time
Date	200711
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 1v5.airport
State Reference	CO
Altitude	msl single value : 9200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Sail Plane
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : commercial
Experience	flight time total : 3300 flight time type : 500
ASRS Report	762533
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

My aircraft; a dg-505 2-SEAT sailplane; was proceeding in level flight on approximately 330 degree (magnetic) heading. Noticed propeller sound from 4 O'clock position; twin (probably aerostar) was seen in head-on profile crossing directly under. Twin was flying on approximately heading of 040 degrees. After incident; flight of both aircraft was continued normally. Visibility was essentially unlimited. It appeared that the twin's pilot noticed the sailplane a few seconds before potential collision and pushed down for avoidance. Time available in glider from moment of noticing the twin to its passage directly below was in the order of 1 second.

Original NASA ASRS Text

Title: SAILPLANE AND AEROSTAR EXPERIENCE NMAC.

Narrative: MY ACFT; A DG-505 2-SEAT SAILPLANE; WAS PROCEEDING IN LEVEL FLT ON APPROX 330 DEG (MAGNETIC) HDG. NOTICED PROP SOUND FROM 4 O'CLOCK POS; TWIN (PROBABLY AEROSTAR) WAS SEEN IN HEAD-ON PROFILE CROSSING DIRECTLY UNDER. TWIN WAS FLYING ON APPROX HDG OF 040 DEGS. AFTER INCIDENT; FLT OF BOTH ACFT WAS CONTINUED NORMALLY. VISIBILITY WAS ESSENTIALLY UNLIMITED. IT APPEARED THAT THE TWIN'S PLT NOTICED THE SAILPLANE A FEW SECONDS BEFORE POTENTIAL COLLISION AND PUSHED DOWN FOR AVOIDANCE. TIME AVAILABLE IN GLIDER FROM MOMENT OF NOTICING THE TWIN TO ITS PASSAGE DIRECTLY BELOW WAS IN THE ORDER OF 1 SECOND.

Data retrieved from NASA's ASRS site as of January 2009 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.