Regional Jet 200 ER/LR (CRJ200)
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
ATC Issue All Types; Conflict NMAC
Air Traffic Control Issued New Clearance; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Human Factors; Procedure
Climbing to FL 310 as cleared. Noticed TCAS target closing climbing through FL26.5. ATC told us to 'go back down and level off' at FL 260. Received an RA to 'descend; descend' and we acted accordingly. Descending aircraft came within 400 feet vertical clearance.
CRJ-200 Captain reported NMAC in climb at FL265.