A B757 flight crew experiences a TCASII RA and indicated a miss of 100 ft. ATC had nothing on radar.

Attributes
ACN	573054
Time
Date	200302
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : abq.airport
State Reference	NM
Altitude	msl single value : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zab.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : cfi pilot : atp pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 180 flight time total : 23000 flight time type : 2000
ASRS Report	573054
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : airborne critical other anomaly other
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took evasive action flight crew : took precautionary avoidance action
Consequence	Other
Miss Distance	vertical : 100
Supplementary
Problem Areas	Aircraft ATC Human Performance Airspace Structure
Primary Problem	ATC Human Performance

Narrative:

At FL390, we received a TCASII TA. Target idented as -100 (FL389) on converging course. Shortly thereafter, we received an RA and instruction to climb. We initiated climb to FL400 and watched TCASII target pass off our right side still at FL390. When clear of conflict, we descended back to FL390 and advised ATC. No loss of separation occurred. ATC said only other traffic was at FL370. We advised that we also had the FL370 traffic in sight and on TCASII. FL390 traffic not acquired visually. No passenger injuries reported. We later called ZAB and supervisor reported flight 15 mins behind us reported same event. We think that the cause was probably military related due to proximity of white sands test range.

Original NASA ASRS Text

Title: A B757 FLC EXPERIENCES A TCASII RA AND INDICATED A MISS OF 100 FT. ATC HAD NOTHING ON RADAR.

Narrative: AT FL390, WE RECEIVED A TCASII TA. TARGET IDENTED AS -100 (FL389) ON CONVERGING COURSE. SHORTLY THEREAFTER, WE RECEIVED AN RA AND INSTRUCTION TO CLB. WE INITIATED CLB TO FL400 AND WATCHED TCASII TARGET PASS OFF OUR R SIDE STILL AT FL390. WHEN CLR OF CONFLICT, WE DSNDED BACK TO FL390 AND ADVISED ATC. NO LOSS OF SEPARATION OCCURRED. ATC SAID ONLY OTHER TFC WAS AT FL370. WE ADVISED THAT WE ALSO HAD THE FL370 TFC IN SIGHT AND ON TCASII. FL390 TFC NOT ACQUIRED VISUALLY. NO PAX INJURIES RPTED. WE LATER CALLED ZAB AND SUPVR RPTED FLT 15 MINS BEHIND US RPTED SAME EVENT. WE THINK THAT THE CAUSE WAS PROBABLY MIL RELATED DUE TO PROX OF WHITE SANDS TEST RANGE.

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.