<< >> NASA ASRS Report 898131, July 2010

The FMS on the ce-680 provided incorrect lateral guidance on the musel SID; sli transition out of sna.

Attributes
ACN	898131
Time
Date	201007
Local Time Of Day	0601-1200
Place
Locale Reference	SNA.Airport
State Reference	CA
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Cessna Citation Sovereign (C680)
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	SID MUSEL 6
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Departing from sna on the MUSEL6 departure; dag transition; with the autopilot off and navigation captured to the FMS; the FMS began a 'smart turn' before musel intersection well prior to the intersection itself. The clearance and departure route description off 19R reads 'maintain runway heading or isna localizer south course to isna 1 DME fix or sli R-118; turn left heading 175 degrees for radar vectors to musel intersection.' the magenta course needle flipped to 330 degrees to intercept the course from musel to sli approximately one mile prior after takeoff and in the turn to 175 degrees. If followed; or with the autopilot engaged this would have been a clearance deviation. Do not engage the autopilot and follow heading on chart instead of flight director; or fly green needles. Change in database needed to make musel intersection a flyover point for all transitions.

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Original NASA ASRS Text

Title: The FMS on the CE-680 provided incorrect lateral guidance on the MUSEL SID; SLI Transition out of SNA.

Narrative: Departing from SNA on the MUSEL6 departure; DAG transition; with the autopilot off and NAV captured to the FMS; the FMS began a 'smart turn' before MUSEL intersection well prior to the intersection itself. The clearance and departure route description off 19R reads 'Maintain runway heading or ISNA localizer south course to ISNA 1 DME fix or SLI R-118; turn LEFT heading 175 degrees for radar vectors to MUSEL intersection.' The magenta course needle flipped to 330 degrees to intercept the course from MUSEL to SLI approximately one mile prior after takeoff and in the turn to 175 degrees. If followed; or with the autopilot engaged this would have been a clearance deviation. Do not engage the autopilot and follow heading on chart instead of flight director; or fly green needles. Change in database needed to make MUSEL intersection a FLYOVER point for all transitions.

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.