Date: 201501
Local time of day: 0001-0600
Location: ZDV.ARTCC, CO
Flight conditions: IMC
Aircraft: B737 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Descent
Airspace: Class A ZDV
ATC / advisory: Center ZDV
Aircraft component: TCAS Equipment
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Human factors: Confusion
Second reporter function: Captain; Pilot Flying
Anomaly: Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude
Detector: Automation Aircraft RA; Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Contributing factors: Environment - Non Weather Related
Primary problem: Environment - Non Weather Related

Narrative: Approx. 20 east of RLG VOR cleared for the LOC FMS 25 into EGE. Cleared to cross RLG at 15000 and cleared for the approach. We were descending through about 20;500 when we got a Climb resolution advisory (RA) with no prior traffic advisory (TA) warning and no prior display of the traffic. Two targets appeared at 10 o'clock and less than 5 miles. They were initially red and indicating -800 and -500. We disconnected autoflight systems and followed the CLIMB RA guidance. We advised DEN center we were climbing in response to an RA and they said the only traffic in our area was a flight of TWO B-1's but that they were assigned 1000 above our altitude. At the closest point the red symbols showed the aircraft -100 and -200 [feet] and directly below us on the 5 mile scale. The symbols then disappeared and the climb RA went away. The traffic then reappeared in white approximately 800 [feet] ABOVE us. I have no idea what sort of ability the B-1's have to slew their position to other aircrafts TCAS systems but it sure seems like they were doing something screwy with electronics. The really scary part is that we had CLIMB guidance which has us headed right for them if they were indeed 1000 [feet] above us. We never saw the traffic due to the cloud layers. The Denver controller asked the B-1s to confirm their altitude but we did not hear the response. They were obviously on a different frequency. The controller told us they had confirmed they were above us and asked if we saw them. We said no.


Second narrative: While descending on the approach into EGE just over the front range we received an RA depicting 2 aircraft initially at 800 Ft below then 500 Ft then 100 Ft. At the initial warning the autopilot and auto throttles were disconnected and an immediate climb was initiated. During the avoidance maneuver the threats disappeared but we found ourselves encountering 2 advisories above us. Took correct action and re-entered our descent into the EGE airport. After advising DEN ARTCC we were told of a flight two B-1's above us that were supposed to be in block I believe FL 230-270. No further incidents ensued and we landed in EGE.


Synopsis: B737 flight crew experiences a false TCAS RA to climb apparently generated by two B-1's above the B737. After initially climbing the RA switches to a descent.