<< >> NASA ASRS Report 363969, March 1997

Report of a glider operation by air carrier B737 inbound to las at 10400 ft. Reporter had not seen the primary target until after the air carrier passed it.

Attributes
ACN	363969
Time
Date	199703
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bld
State Reference	NV
Altitude	msl bound lower : 10400 msl bound upper : 10400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Sail Plane
Operating Under FAR Part	other : other
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 12 controller supervisory : 1
ASRS Report	363969
Person 2
Affiliation	government : faa
Function	controller : approach other personnel other
Qualification	controller : radar pilot : instrument
Experience	flight time total : 350
ASRS Report	363974
Events
Anomaly	other anomaly other
Miss Distance	horizontal : 2500 vertical : 0
Supplementary
Air Traffic Incident	other

Narrative:

The B737 was on the creso STAR, called at whigg intersection at 12000 ft. Per SOP, I told the B737 to descend and maintain 10000 ft. The pilot called and said that he had passed a glider, level altitude off his right. The altitude was 10400 ft MSL. While I had not noticed the glider's target before the incident, I was able to see the target behind the B737. Thereafter, I saw a primary target in the area, intermittently.

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Original NASA ASRS Text

Title: RPT OF A GLIDER OP BY ACR B737 INBOUND TO LAS AT 10400 FT. RPTR HAD NOT SEEN THE PRIMARY TARGET UNTIL AFTER THE ACR PASSED IT.

Narrative: THE B737 WAS ON THE CRESO STAR, CALLED AT WHIGG INTXN AT 12000 FT. PER SOP, I TOLD THE B737 TO DSND AND MAINTAIN 10000 FT. THE PLT CALLED AND SAID THAT HE HAD PASSED A GLIDER, LEVEL ALT OFF HIS R. THE ALT WAS 10400 FT MSL. WHILE I HAD NOT NOTICED THE GLIDER'S TARGET BEFORE THE INCIDENT, I WAS ABLE TO SEE THE TARGET BEHIND THE B737. THEREAFTER, I SAW A PRIMARY TARGET IN THE AREA, INTERMITTENTLY.

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.