B777 first officer reports track deviation on the tomo west 2 departure from rjbb. While the autopil...

Attributes
ACN	901098
Time
Date	201007
Local Time Of Day	0001-0600
Place
Locale Reference	RJBB.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	SID TOMO WEST 2
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Flight Engineer Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 72 Flight Crew Total 7000 Flight Crew Type 148
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

On the tomo west 2 departure; with the autopilot engaged; the aircraft suddenly turned right while tracking out the 270 radial off of kne (which was on the departure procedure). The captain immediately changed to heading mode and pointed the aircraft at the kne 10.5 DME fix trying to get the aircraft back on course. During the initial aircraft turn off course; the magenta line disappeared from the navigation display (FMS generated). The captain tried to regain the FMS navigation course but within seconds of our first correction back to course; ATC asked us if we were flying the correct departure and we advised them that we had lost our navigation solution and that we were trying to regain it. ATC offered us a heading and we accepted the heading. We then were able to regain FMS navigational cues about 30 seconds later at the most. The departure was briefed and verified prior to departure and the FMS and the navigation display were cross checked with no apparent issues prior to departure. We were unable to figure out why the aircraft turned off course; but we were able to begin the correction back towards course because situational awareness had not been lost. It can also be noted that we are new to this aircraft. Further; with reduced training budgets; crews are entering line service with minimum systems knowledge requiring additional time to correct such problems.

Original NASA ASRS Text

Title: B777 First Officer reports track deviation on the TOMO WEST 2 departure from RJBB. While the autopilot is tracking to the first fix at D10.5 KNE the aircraft suddenly makes a right turn which is quickly corrected by the flying pilot.

Narrative: On the TOMO West 2 departure; with the autopilot engaged; the aircraft suddenly turned right while tracking out the 270 radial off of KNE (which was on the departure procedure). The Captain immediately changed to heading mode and pointed the aircraft at the KNE 10.5 DME fix trying to get the aircraft back on course. During the initial aircraft turn off course; the magenta line disappeared from the Navigation Display (FMS generated). The Captain tried to regain the FMS navigation course but within seconds of our first correction back to course; ATC asked us if we were flying the correct departure and we advised them that we had lost our navigation solution and that we were trying to regain it. ATC offered us a heading and we accepted the heading. We then were able to regain FMS navigational cues about 30 seconds later at the most. The departure was briefed and verified prior to departure and the FMS and the navigation display were cross checked with no apparent issues prior to departure. We were unable to figure out why the aircraft turned off course; but we were able to begin the correction back towards course because situational awareness had not been lost. It can also be noted that we are new to this aircraft. Further; with reduced training budgets; crews are entering line service with minimum systems knowledge requiring additional time to correct such problems.

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.

B777 first officer reports track deviation on the tomo west 2 departure from rjbb. While the autopilot is tracking to the first fix at D10.5 kne the aircraft suddenly makes a right turn which is quickly corrected by the flying pilot.