2011-11 · NASA ASRS report 980110
A CRJ-700 Flight Crew departed LGA in the DG (Directional Gyro) mode. When airborne the Captain and First Officer headings diverged and track deviations ensued. Ultimately the headings were aligned and MAG AHRS/EFIS guidance engaged and the flight continued normally.
On takeoff from Runway 13 in DG mode; both PFDs were properly aligned. While on the White Stone Departure; no problems on first turn 180 degrees. No problems on second turn 040 degrees. Prior to the third turn we got HDG and EFIS Comparators on Captain's side which lead us to believe that my side was good because there was no alert on my PFD. The Captain tried to fix his by going to MAG Mode while holding a steady 250K but was unsuccessful. He then went back to DG to try and realign. On our third turn ATC asked where we were going; we stated we were 20 degrees left of course. I then lost my Flight Director and course line and we received HDG and MAG warnings. We asked ATC to remain on current heading; altitude; and airspeed of 250K. Our PFDs were over 50 degrees apart and we were unable to navigate to a fix. I maintained 15000 MSL straight and level at 250K. With both PFDs in DG mode; we slewed both to 250 degrees; as this was our approximate heading. We then engaged MAG mode and resumed normal flight.
We had to depart LGA on Runway 13 in DG mode planning to go back into MAG mode while on ATC headings. I should have waited until I was cleared to a fix; in white needles; and at that point; switched to MAG mode.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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