B757 first officer reported the TCAS system displayed traffic co-located with their position; no vis...

Attributes
ACN	1370187
Time
Date	201607
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Traffic Collision Avoidance System (TCAS)
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 10507 Flight Crew Type 8100
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Speed All Types

Narrative:

On departure we received a TA followed quickly by an RA to climb; then to maintain climb; then eventually a reversal to an aggressive descend now. I immediately complied with all of the RA commands; while the captain and I both tried to visually acquire the threat. It showed a relative altitude of zero throughout the TCAS climb and descent; as if shadowing us. Finally the captain selected the right transponder and the warnings stopped. During the event I exceeded 250 KTS under 10;000 feet. Max speed achieved was 270 KTS. When the conflict disappeared; I returned to a normal climb at 250 KTS and re-engaged the automation.

Original NASA ASRS Text

Title: B757 First Officer reported the TCAS system displayed traffic co-located with their position; no visual contact established. Changing transponders solved the problem.

Narrative: On departure we received a TA followed quickly by an RA to climb; then to maintain climb; then eventually a reversal to an aggressive Descend NOW. I immediately complied with all of the RA commands; while the Captain and I both tried to visually acquire the threat. It showed a relative altitude of Zero throughout the TCAS climb and descent; as if shadowing us. Finally the captain selected the right transponder and the warnings stopped. During the event I exceeded 250 KTS under 10;000 feet. Max speed achieved was 270 KTS. When the conflict disappeared; I returned to a normal climb at 250 KTS and re-engaged the automation.

Data retrieved from NASA's ASRS site 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.

B757 first officer reported the TCAS system displayed traffic co-located with their position; no visual contact established. Changing transponders solved the problem.