CL30 first officer states that the MIXUT2 as flown by his rockwell collins proline 21 avionics syste...

Narrative:

Prior to passenger boarding we briefed the MIXUT2 (6L) departure procedure. The first instruction is to fly a 57 degree heading to 1000' msl then continue of a 57 heading and expect vectors to mobel. During the discussion we determined we should fly the departure in nav mode instead of heading because the vector was contained in the FMS legs page. At 1000' MSL the FMS commanded a turn toward mobel. The pilot flying (PF) turned (we were hand flying; the autopilot would have done the same thing) and we were immediately questioned by departure control as to our assigned heading. We confessed our turn and were vectored back to the departure course. I believe this departure procedure (MIXUT2) is coded incorrectly in the navigation database. There is no sequence inhibit or gap between the vector and the first waypoint (mobel). The turn to the waypoint is an 'expect' only; not a fixed turn. We have seen several sequence type errors on departures with headings in the rockwell collins proline 21 avionics systems. We have reported it to them and they say it will be 'corrected' in the next database revision. The sequence errors keep appearing. If we had flown the procedure in heading the problem would not have occurred. That is our new; accepted procedure with a departure with an initial heading. We had just completed an in house RNAV/rnp/pbn training which stressed retrieving departures from the database and never to modify them. We complied with that guidence but if we would have inhibited the sequence that would have eliminated the problem as well. We trust the procedures to be correct out of the box. Missing gaps or sequence inhibits are critical on most departures yet they are hard to find in the proline 21 FMS leg page.lastly as the pilot not flying (pilot monitoring) I should have stopped the PF from making the turn but I was preoccupied with traffic avoidence and gear and flap retraction.

Original NASA ASRS Text

Title: CL30 First Officer states that the MIXUT2 as flown by his Rockwell Collins Proline 21 avionics system; does not maintain the 057 degree heading as required by the SID. Instead; at 1000 feet; it directs a turn direct to MOBEL. ATC detects the error.

Narrative: Prior to passenger boarding we briefed the MIXUT2 (6L) departure procedure. The first instruction is to fly a 57 degree heading to 1000' msl then continue of a 57 heading and expect vectors to MOBEL. During the discussion we determined we should fly the departure in nav mode instead of heading because the vector was contained in the FMS legs page. At 1000' MSL the FMS commanded a turn toward MOBEL. The pilot flying (PF) turned (we were hand flying; the autopilot would have done the same thing) and we were immediately questioned by Departure Control as to our assigned heading. We confessed our turn and were vectored back to the departure course. I believe this departure procedure (MIXUT2) is coded incorrectly in the navigation database. There is no sequence inhibit or gap between the vector and the first waypoint (MOBEL). The turn to the waypoint is an 'expect' only; not a fixed turn. We have seen several sequence type errors on departures with headings in the Rockwell Collins Proline 21 avionics systems. We have reported it to them and they say it will be 'corrected' in the next database revision. The sequence errors keep appearing. If we had flown the procedure in HDG the problem would not have occurred. That is our new; accepted procedure with a departure with an initial heading. We had just completed an in house RNAV/RNP/PBN training which stressed retrieving departures from the database and never to modify them. We complied with that guidence but if we would have inhibited the sequence that would have eliminated the problem as well. We trust the procedures to be correct out of the box. Missing gaps or sequence inhibits are critical on most departures yet they are hard to find in the Proline 21 FMS leg page.Lastly as the pilot not flying (pilot monitoring) I should have stopped the PF from making the turn but I was preoccupied with traffic avoidence and gear and flap retraction.

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.

Attributes
ACN	1274124
Time
Date	201506
Local Time Of Day	0601-1200
Place
Locale Reference	CYYZ.TRACON
State Reference	ON
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Challenger 300
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	SID Mixut2
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 45 Flight Crew Total 8500 Flight Crew Type 600
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

CL30 first officer states that the MIXUT2 as flown by his rockwell collins proline 21 avionics system; does not maintain the 057 degree heading as required by the SID. Instead; at 1000 feet; it directs a turn direct to mobel. ATC detects the error.