Narrative:

The flight was cleared via mcb..muury..cew..direct. I was the pilot not flying and had cross-filled the first officer's FMS with mine during preflight. After passing mcb; exactly when I'm not sure; my first officer questioned his mfd display. We began to investigate why it looked as though the route double-backed after murry; when ATC told us to go direct murry. However; ATC mentioned that we may have murry misspelled in our flight plan. We checked it and sure enough the FMS was loaded with murry; with two right's; but it should have been muury with two U's. The fix murry is the IAF for cae ILS 11. After replacing murry with muury I noticed that the correct FMS course should have been 102 degrees. After getting the direct clearance from ATC the current FMS course to muury was 110-degrees or a difference of 008-degrees. In thinking back to our preflight activities I recalled loading my FMS and cross-filling the first officer's FMS. We checked both fmss for a current FMS database; Q value; and that prchdg was displayed. We reviewed all the waypoints on the RNAV SID out to mcb. Then I selected the compress option of the FMS and made a quick review of the remaining waypoints. I'm sure I probably went right by muury not noticing that it was spelled wrong. However; on the ground I reloaded the flight in the FMS with the misspelled fix; murry; and noticed that the mfd didn't display any waypoints past mcb. I loaded the FMS with the correctly spelled fix; muury; and noticed that the mfd still didn't display any waypoints past mcb; it looked the same as before. The first officer reminded me that the FMS only displayed 10 waypoints. Mcb was the tenth waypoint. So this error could not have been trapped using the mfd prior to departure. A technique during preflight would be to compare the total trip distance on the FMS fpl summary with the total trip distance on the flight plan; assuming no reroute. The FMS fpl summary showed a distance of 583 NM; but with the incorrect waypoint the fpl summary showed 1;212 NM. In any case; by checking the course and distance when approaching each waypoint any errors should be trapped.

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Original NASA ASRS Text

Title: EMB145 flight crew experiences a track deviation during cruise flight due to the waypoint MUURY being entered as MURRY. ATC alerts the crew to the deviation and appears to be aware of the cause.

Narrative: The flight was cleared via MCB..MUURY..CEW..direct. I was the pilot not flying and had cross-filled the First Officer's FMS with mine during preflight. After passing MCB; exactly when I'm not sure; my First Officer questioned his MFD display. We began to investigate why it looked as though the route double-backed after MURRY; when ATC told us to go direct MURRY. However; ATC mentioned that we may have MURRY misspelled in our flight plan. We checked it and sure enough the FMS was loaded with MURRY; with two R's; but it should have been MUURY with two U's. The fix MURRY is the IAF for CAE ILS 11. After replacing MURRY with MUURY I noticed that the correct FMS course should have been 102 degrees. After getting the direct clearance from ATC the current FMS course to MUURY was 110-degrees or a difference of 008-degrees. In thinking back to our preflight activities I recalled loading my FMS and cross-filling the First Officer's FMS. We checked both FMSs for a current FMS database; Q value; and that PRCHDG was displayed. We reviewed all the waypoints on the RNAV SID out to MCB. Then I selected the COMPRESS option of the FMS and made a quick review of the remaining waypoints. I'm sure I probably went right by MUURY not noticing that it was spelled wrong. However; on the ground I reloaded the flight in the FMS with the misspelled fix; MURRY; and noticed that the MFD didn't display any waypoints past MCB. I loaded the FMS with the correctly spelled fix; MUURY; and noticed that the MFD still didn't display any waypoints past MCB; it looked the same as before. The First Officer reminded me that the FMS only displayed 10 waypoints. MCB was the tenth waypoint. So this error could not have been trapped using the MFD prior to departure. A technique during preflight would be to compare the total trip distance on the FMS FPL SUMMARY with the total trip distance on the flight plan; assuming no reroute. The FMS FPL SUMMARY showed a distance of 583 NM; but with the incorrect waypoint the FPL SUMMARY showed 1;212 NM. In any case; by checking the course and distance when approaching each waypoint any errors should be trapped.

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.