Narrative:

Houston center had received flight plans from monterey center on 2 jets departing the monterey airport and climbing over laredo VORTAC and to continue on the same rtes until the san antonio VORTAC at which time the rtes would diverge. I (the radar controller) observed both aircraft on my scope while they were still well (50 or 60 mi) inside montereys airspace. I immediately observed that the back aircraft had about an 80 KT overtake on the front aircraft, and the back aircraft was lower but climbing at a greater rate then the front aircraft. I attempted to call monterey center to make sure they were aware of the situation and to offer an off course vector to the aircraft in back. Monterey center would not answer my call. A min or 2 later I tried to call again and still got no answer. I tried a third time and still got no answer. The aircraft were about to enter my (USA) airspace and were less than 10 mi apart and less than 2000 ft vertically and the rear aircraft still had an 80 KT overtake. I had my assistant controller call mty and he finally got hold of the mty controller. I told my assistant to have mty assign the rear aircraft FL290 and a heading of 030 degree. Mty acknowledged. We then observed the aircraft enter USA airspace and the rear aircraft flew through FL290 up to about FL304 before he started back down to FL290 and then slowly began a right turn. Separation was lost between the 2 aircraft at or about the common houston center/monterey center boundary. Monterey center did not provide positive (or any other) separation, nor did they provide a timely handoff on either aircraft, nor did they provide timely communication change. The aircraft in front was an cpr X light transport filed for FL370 and the rear aircraft was a cpr Y, mdt, for FL410.

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Original NASA ASRS Text

Title: CPR Y CLB THROUGH OCCUPIED ALT HAD LTSS FROM CPR X. SYS ERROR.

Narrative: HOUSTON CTR HAD RECEIVED FLT PLANS FROM MONTEREY CTR ON 2 JETS DEPARTING THE MONTEREY ARPT AND CLBING OVER LAREDO VORTAC AND TO CONTINUE ON THE SAME RTES UNTIL THE SAN ANTONIO VORTAC AT WHICH TIME THE RTES WOULD DIVERGE. I (THE RADAR CTLR) OBSERVED BOTH ACFT ON MY SCOPE WHILE THEY WERE STILL WELL (50 OR 60 MI) INSIDE MONTEREYS AIRSPACE. I IMMEDIATELY OBSERVED THAT THE BACK ACFT HAD ABOUT AN 80 KT OVERTAKE ON THE FRONT ACFT, AND THE BACK ACFT WAS LOWER BUT CLBING AT A GREATER RATE THEN THE FRONT ACFT. I ATTEMPTED TO CALL MONTEREY CTR TO MAKE SURE THEY WERE AWARE OF THE SITUATION AND TO OFFER AN OFF COURSE VECTOR TO THE ACFT IN BACK. MONTEREY CTR WOULD NOT ANSWER MY CALL. A MIN OR 2 LATER I TRIED TO CALL AGAIN AND STILL GOT NO ANSWER. I TRIED A THIRD TIME AND STILL GOT NO ANSWER. THE ACFT WERE ABOUT TO ENTER MY (USA) AIRSPACE AND WERE LESS THAN 10 MI APART AND LESS THAN 2000 FT VERTICALLY AND THE REAR ACFT STILL HAD AN 80 KT OVERTAKE. I HAD MY ASSISTANT CTLR CALL MTY AND HE FINALLY GOT HOLD OF THE MTY CTLR. I TOLD MY ASSISTANT TO HAVE MTY ASSIGN THE REAR ACFT FL290 AND A HDG OF 030 DEG. MTY ACKNOWLEDGED. WE THEN OBSERVED THE ACFT ENTER USA AIRSPACE AND THE REAR ACFT FLEW THROUGH FL290 UP TO ABOUT FL304 BEFORE HE STARTED BACK DOWN TO FL290 AND THEN SLOWLY BEGAN A R TURN. SEPARATION WAS LOST BTWN THE 2 ACFT AT OR ABOUT THE COMMON HOUSTON CTR/MONTEREY CTR BOUNDARY. MONTEREY CTR DID NOT PROVIDE POSITIVE (OR ANY OTHER) SEPARATION, NOR DID THEY PROVIDE A TIMELY HDOF ON EITHER ACFT, NOR DID THEY PROVIDE TIMELY COM CHANGE. THE ACFT IN FRONT WAS AN CPR X LTT FILED FOR FL370 AND THE REAR ACFT WAS A CPR Y, MDT, FOR FL410.

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.