ZDV controller described a loss of separation event between an ege IFR arrival and departure resulti...

Narrative:

Aircraft X departed ege VFR and called me requesting his IFR clearance. I issued him his code and verified his mode-C. He informed me he was maneuvering reference the terrain in his climb. I had aircraft Y on approach to ege joining the localizer. I worried that aircraft X might get far enough north to become a factor with aircraft Y; however I asked aircraft X if he could maintain his own terrain and obstruction clearance to 170; received an affirmative response and cleared him to his destination; wwr; reiterating that he was to maintain his own terrain and obstruction clearance to 170. In my mind I cleared him to climb VFR to 170 which would have separated him from aircraft Y. The way I actually cleared him did not separate him. I believed I had issued the correct clearance until hearing the tape. Recommendation; the only recommendation I would make is to be precise with your language; and try to make sure to say what you mean.

Original NASA ASRS Text

Title: ZDV Controller described a loss of separation event between an EGE IFR arrival and departure resulting from an inappropriate use of procedures and phraseology.

Narrative: Aircraft X departed EGE VFR and called me requesting his IFR clearance. I issued him his code and verified his Mode-C. He informed me he was maneuvering reference the terrain in his climb. I had Aircraft Y on approach to EGE joining the LOC. I worried that Aircraft X might get far enough north to become a factor with Aircraft Y; however I asked Aircraft X if he could maintain his own terrain and obstruction clearance to 170; received an affirmative response and cleared him to his destination; WWR; reiterating that he was to maintain his own terrain and obstruction clearance to 170. In my mind I cleared him to climb VFR to 170 which would have separated him from Aircraft Y. The way I actually cleared him did not separate him. I believed I had issued the correct clearance until hearing the tape. Recommendation; the only recommendation I would make is to be precise with your language; and try to make sure to say what you mean.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	961723
Time
Date	201107
Local Time Of Day	1201-1800
Place
Locale Reference	ZDV.ARTCC
State Reference	CO
Aircraft 1
Make Model Name	Cessna 210 Centurion / Turbo Centurion 210C 210D
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

ZDV controller described a loss of separation event between an ege IFR arrival and departure resulting from an inappropriate use of procedures and phraseology.