Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 19
Time Pressure
Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Procedure
Aircraft X was 40 miles west of BLD VOR at FL330 requesting FL350. Aircraft Y was 40 miles NE of BLD VOR at FL340 requesting FL360. Both aircraft were inbound to BLD VOR. I issued climb clearance to Aircraft X to FL340 and shortly thereafter; I issued a climb clearance to Aircraft Y to FL360. I observed Aircraft Y Mode C at FL350; and issued a climb clearance to Aircraft X to FL350. Both aircraft were over 30 miles apart converging to BLD VOR. I noticed Aircraft Y Mode C level at FL355 and inquired to pilot if he was climbing. He advised he was and informed me that his last 500 feet would be a less than standard climb. I issued traffic to both aircraft. Aircraft Y advised he had traffic in sight and Aircraft X said he was responding to a TCAS event. I acknowledged.
ZLA Controller describes a climb clearance given to an aircraft and the aircraft's climb rate changes the last 500 feet causing another aircraft to have an RA and the Controller to have a loss of separation.