Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 200; Flight Crew Total 4400; Flight Crew Type 2300
Training / Qualification; Situational Awareness; Confusion
Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Clearance; Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Aircraft; Human Factors; Procedure
While cruising at FL370; our routing took us from MCB to MUURY. Upon reaching MCB; I noticed the aircraft turning beyond the proper course. The reason for this came from the pilot's side FMS navigating to MURRY. The pilot's FMS was coupled to the autopilot. We took corrective action immediately and returned the aircraft on course to MUURY. In the turn; we disconnected the autopilot to expedite our return to the flight planned route; and we lost about 100 FT in the process. As we started our corrective turn back toward MUURY; ATC queried us to make sure we were heading to MUURY and not MURRY. The copilot's FMS was programmed properly; showing a course discrepancy in the turn over MCB which wasn't obvious because of the close proximity of the courses to MUURY and MURRY from MCB. The flight plans on both FMSs were checked against each other but the misspelling of one waypoint was overlooked.
An Air Carrier crew cleared from SWB to MUURY had erroneously entered MURRY in the FMS during preflight; so after passing SWB the aircraft turned northeast toward MURRY verses southeast. The distance from SWB to MUURY is 133 NM; to MURRY is 482 NM. The MUURY to MURRY distance is 381 NM northeast. Two other MURRY waypoints exist; one in Australia; another in the Hong Kong FIR.