A non pegasus equipped B767 on the lax 25R oshnn three RNAV departure had a track deviation after li...

Attributes
ACN	930651
Time
Date	201102
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	SID OSHNN
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

After takeoff; just about to call for LNAV; saw a large difference between our heading and runway heading; and intersections on FMS display; and suspected a map shift had occurred. Did not engage the autopilot. We were then assigned a low altitude level off at 3;000 ft; as we were climbing thru 2;200 ft. We tried to ask the controller for a heading because of the FMS problem but there was too much radio congestion; and then we were given a clearance to proceed direct pevee; and a climb to a higher altitude. The controller never asked [or] questioned us about anything. There were no further issues with this 'basic' FMS equipped aircraft for the remainder of the flight.

Original NASA ASRS Text

Title: A non Pegasus equipped B767 on the LAX 25R OSHNN THREE RNAV Departure had a track deviation after liftoff when the aircraft turned toward the 24 Runways while the FMS calculated the aircraft's position and necessary track.

Narrative: After takeoff; just about to call for LNAV; saw a large difference between our heading and runway heading; and intersections on FMS display; and suspected a map shift had occurred. Did not engage the autopilot. We were then assigned a low altitude level off at 3;000 FT; as we were climbing thru 2;200 FT. We tried to ask the Controller for a heading because of the FMS problem but there was too much radio congestion; and then we were given a clearance to proceed direct PEVEE; and a climb to a higher altitude. The Controller never asked [or] questioned us about anything. There were no further issues with this 'basic' FMS equipped aircraft for the remainder of the flight.

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.

A non pegasus equipped B767 on the lax 25R oshnn three RNAV departure had a track deviation after liftoff when the aircraft turned toward the 24 runways while the FMS calculated the aircraft's position and necessary track.