EMB ERJ 170/175 ER/LR
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Overcame Equipment Problem; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Aircraft
The phase of flight was just after lift off from runway 16L in KSLC during the WEVIC6 RNAV departure before acceleration altitude (1000 FT AGL). The Pilot Flying; the First Officer; initiated a left turn as the command bars of the Flight Director suggested to do. We both felt immediately that something was wrong because it was not what we had briefed on the ground about the SID. We both glanced at the plate and as we were correcting the heading back to the initial; SLC Tower gave us a heading of 170 with a climb altitude of 10;000 feet to maintain to rejoin the SID after querying if we were proceeding to the HOPTO fix as cleared. In the meantime I did notice on the MFD that a 360 degree loop was present which was linked to the SID with a turn to the left which was not there earlier nor was it showing in the departure page review of the MCDU. After the event and the recovery; we continued on the SID to our filed altitude. When transferred to departure a telephone number was provided to call SLC. I spoke to a gentleman who told me that a similar event had occurred previously and I emphasized the fact that the MCDU (FMS) does not show the 360 loop after takeoff until we were airborne. It seems that this is a recurring event.
During the taxi; the departure was reviewed again [and] everything still looked normal. The takeoff from Runway 16L was normal (NAV was armed before the pushback from the gate). Once airborne everything was still normal; reaching 400 feet NAV was captured. At approximately 900 feet AGL; the flight director showed a left turn. I looked down at the MFD and it was showing a left 360 then to continue the departure.
EMB-175 flight crew reported that the FMS presented incorrect navigation data on the WEVIC6 RNAV departure from KSLC after takeoff.