Narrative:

Was cleared to cukbo; which is the IAF for the RNAV/GPS 35 approach (LNAV) into prx. Since a procedure turn would not be required; when I put the approach into the box I deleted the procedure turn. Then I was told to expect to hold at cukbo for traffic on the approach. I was subsequently cleared to cukbo; to hold at cukbo at 5;000 feet and as published. I initiated the descent from 8;000 feet; and then attempted to use the 'hold' page on the FMS (a honeywell GNS/xls) to re-establish the holding pattern at cukbo so that the aircraft would enter the hold when it reached the fix. Unfortunately I messed up; and had to reattempt twice. Once I finally thought I had it correct (maintaining situational awareness in regards to the weather; which was continuous rain and light chop); I executed the change. This initiated an immediate right turn; which was correct for a direct entry to hold right as published. I was surprised that I was so close to cukbo when I finally got the holding pattern executed; but looking at the pilot's moving map indeed showed cukbo to be the fix we were about to hold on. Cukbo was clearly displayed on the map; with the holding pattern depicted; and then the remaining fixes on the approach into paris.what I failed to realize; however; is that instead of programming the box to enter the hold at the desired fix; I had instead created a present position hold; simultaneously creating a new pilot-created waypoint designated 'cukbo'; since that was what I had entered as the name of the fix to hold on.I didn't realize this until approximately 25-30 seconds later; when I noted that I was still 25 miles to the south of prx; while cukbo the IAF is within 10 miles of the field. A cross reference of the approach chart confirmed this; and I quickly cleared the box; reloaded the approach and entered direct cukbo. This turned the aircraft quickly back to the fix I'd been cleared to; resulting in a roughly 360 degree turn over the course of just over one minute. I estimate that based on my rate of descent; and the altitudes involved (8;000 feet to 6;200 feet when I turned back to cukbo).this is the fault of my unfamiliarity with the GNS/xls box; as I normally fly the collins proline 21 in the aircraft I regularly operate. This is a deficiency I have rectified this afternoon by re-studying the honeywell manual and making myself familiar with the correct procedure for establishing and entering a hold.

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Original NASA ASRS Text

Title: CE-525 pilot reported making an error programming a hold in his FMS; highlighting several 'gotcha' areas that can trip up the unwary or undertrained.

Narrative: Was cleared to CUKBO; which is the IAF for the RNAV/GPS 35 Approach (LNAV) into PRX. Since a procedure turn would not be required; when I put the approach into the box I deleted the procedure turn. Then I was told to expect to hold at CUKBO for traffic on the approach. I was subsequently cleared to CUKBO; to hold at CUKBO at 5;000 feet and as published. I initiated the descent from 8;000 feet; and then attempted to use the 'HOLD' page on the FMS (a Honeywell GNS/XLS) to re-establish the holding pattern at CUKBO so that the aircraft would enter the hold when it reached the fix. Unfortunately I messed up; and had to reattempt twice. Once I finally thought I had it correct (maintaining situational awareness in regards to the weather; which was continuous rain and light chop); I executed the change. This initiated an immediate right turn; which was correct for a direct entry to hold right as published. I was surprised that I was so close to CUKBO when I finally got the holding pattern executed; but looking at the pilot's moving map indeed showed CUKBO to be the fix we were about to hold on. CUKBO was clearly displayed on the map; with the holding pattern depicted; and then the remaining fixes on the approach into Paris.What I failed to realize; however; is that instead of programming the box to enter the hold at the desired fix; I had instead created a present position hold; simultaneously creating a new pilot-created waypoint designated 'CUKBO'; since that was what I had entered as the name of the fix to hold on.I didn't realize this until approximately 25-30 seconds later; when I noted that I was still 25 miles to the south of PRX; while CUKBO the IAF is within 10 miles of the field. A cross reference of the approach chart confirmed this; and I quickly cleared the box; reloaded the approach and entered direct CUKBO. This turned the aircraft quickly back to the fix I'd been cleared to; resulting in a roughly 360 degree turn over the course of just over one minute. I estimate that based on my rate of descent; and the altitudes involved (8;000 feet to 6;200 feet when I turned back to CUKBO).This is the fault of my unfamiliarity with the GNS/XLS box; as I normally fly the Collins ProLine 21 in the aircraft I regularly operate. This is a deficiency I have rectified this afternoon by re-studying the Honeywell manual and making myself familiar with the correct procedure for establishing and entering a hold.

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.