Narrative:

Aircraft X was released off of ege via the cottonwood 2 departure procedure. The aircraft flew the engine out procedure instead of the normal profile to jesie intersection. Upon recognizing the aircraft turning south I immediately called ase approach to point the aircraft out as they had traffic aircraft Y at 16000 inbound to ase and just clearing our shelf and ready to descend. Ase stopped their aircraft at 16000 feet until we could get the aircraft X above the terrain and turned back north. These aircraft merged but separation was not lost.the COTTONWOOD2 procedure off of eagle; co (ege) routinely gets flown incorrectly by the pilots. They fly the engine out procedure which takes them into aspen approaches airspace and a possible confliction with their traffic. Since it is routinely messed up our controllers are on high alert to watch the aircraft carefully so we can call aspen approach and hopefully not have two aircraft get together. This procedure either needs to be terminated or the plate redesigned. Possible changes to the plate would be to add the boundary with aspen approach. Also make the profile route in bolder text and the engine out a lighter dashed line. Also at the turn for the engine out procedure put engine out only procedure (instead of the current wording if engine out). A point of reference might be to look at the localizer FMS rwy 25 at ege to see a similar missed approach procedure to the Cottonwood2 departure procedure that is more clearly defined and possibly easier to read. Further look into the aircraft equipment might be necessary for limitations.

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Original NASA ASRS Text

Title: Denver Center Controller and Corporate Jet aircraft flight crew reported a track deviation incident while on the Cottonwood 2 engine out procedure. Controller stated the Cottonwood 2 SID is not the engine out procedure and routinely gets flown incorrectly due to confusion.

Narrative: Aircraft X was released off of EGE via the Cottonwood 2 departure procedure. The aircraft flew the engine out procedure instead of the normal profile to JESIE intersection. Upon recognizing the aircraft turning South I immediately called ASE approach to point the aircraft out as they had traffic Aircraft Y at 16000 inbound to ASE and just clearing our shelf and ready to descend. ASE stopped their aircraft at 16000 feet until we could get the Aircraft X above the terrain and turned back north. These aircraft merged but separation was not lost.The COTTONWOOD2 procedure off of Eagle; CO (EGE) routinely gets flown incorrectly by the pilots. They fly the engine out procedure which takes them into Aspen Approaches airspace and a possible confliction with their traffic. Since it is routinely messed up our controllers are on high alert to watch the aircraft carefully so we can call Aspen Approach and hopefully not have two aircraft get together. This procedure either needs to be terminated or the plate redesigned. Possible changes to the plate would be to add the boundary with Aspen Approach. Also make the profile route in bolder text and the engine out a lighter dashed line. Also at the turn for the Engine Out Procedure put ENGINE OUT ONLY PROCEDURE (instead of the current wording IF Engine Out). A point of reference might be to look at the LOC FMS Rwy 25 at EGE to see a similar missed approach procedure to the Cottonwood2 departure procedure that is more clearly defined and possibly easier to read. Further look into the aircraft equipment might be necessary for limitations.

Data retrieved from NASA's ASRS site 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.