Narrative:

First aircraft, FK100, was assigned 290 KTS to stay ahead of F900 who was assigned 250 KTS. FK100 speed dropped off. The 2 controllers working the sector saw it and questioned the pilot just as the conflict alert activated. FK100 responded that he had slowed down to 240 KTS. Because of turbulence, the FK100 never advised us of the turbulence nor the speed reduction until we questioned the occurrence. I stopped the F900 below the F100. Supplemental information from acn 489498: during the departure, passing through 16000 ft, we started picking up light to moderate turbulence and it increased through FL230. During that time period, somewhat due to the turbulence and due to my concern for the flight attendants' safety, I increased our rate of climb to reduce the effect of the turbulence and to get out of it as soon as possible. I realized then that we failed to notify ATC that we were slowing down due to turbulence. En route to ama, center asked us to call ZFW. Upon arrival at ama, I called and talked with the manager on duty and explained the situation. He said that our slowing down had interfered with a falcon and he would have to submit a report to quality assurance. Said they had filed a NASA report as there were some problems on their side as well. Supplemental information from acn 489499: I was completing checklists when we received a call from ATC asking us our airspeed.

Related reports:

Google
 

Original NASA ASRS Text

Title: A ZFW CTLR RPT ON A NEAR LOSS OF SEPARATION BTWN AN FK100 AND AN F900 WHEN THE FK100 CREW SLOWED DOWN FOR TURB AND NEVER ADVISED ATC OF THE PROB 40 MI W OF ZFW, TX.

Narrative: FIRST ACFT, FK100, WAS ASSIGNED 290 KTS TO STAY AHEAD OF F900 WHO WAS ASSIGNED 250 KTS. FK100 SPD DROPPED OFF. THE 2 CTLRS WORKING THE SECTOR SAW IT AND QUESTIONED THE PLT JUST AS THE CONFLICT ALERT ACTIVATED. FK100 RESPONDED THAT HE HAD SLOWED DOWN TO 240 KTS. BECAUSE OF TURB, THE FK100 NEVER ADVISED US OF THE TURB NOR THE SPD REDUCTION UNTIL WE QUESTIONED THE OCCURRENCE. I STOPPED THE F900 BELOW THE F100. SUPPLEMENTAL INFO FROM ACN 489498: DURING THE DEP, PASSING THROUGH 16000 FT, WE STARTED PICKING UP LIGHT TO MODERATE TURB AND IT INCREASED THROUGH FL230. DURING THAT TIME PERIOD, SOMEWHAT DUE TO THE TURB AND DUE TO MY CONCERN FOR THE FLT ATTENDANTS' SAFETY, I INCREASED OUR RATE OF CLB TO REDUCE THE EFFECT OF THE TURB AND TO GET OUT OF IT ASAP. I REALIZED THEN THAT WE FAILED TO NOTIFY ATC THAT WE WERE SLOWING DOWN DUE TO TURB. ENRTE TO AMA, CTR ASKED US TO CALL ZFW. UPON ARR AT AMA, I CALLED AND TALKED WITH THE MGR ON DUTY AND EXPLAINED THE SIT. HE SAID THAT OUR SLOWING DOWN HAD INTERFERED WITH A FALCON AND HE WOULD HAVE TO SUBMIT A RPT TO QUALITY ASSURANCE. SAID THEY HAD FILED A NASA RPT AS THERE WERE SOME PROBS ON THEIR SIDE AS WELL. SUPPLEMENTAL INFO FROM ACN 489499: I WAS COMPLETING CHKLISTS WHEN WE RECEIVED A CALL FROM ATC ASKING US OUR AIRSPD.

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.