L-1011 Flight Instruments: Compass Control Panel (31-29)

When DG is elected on the COMPASS panel the following happens:

• DG is free of MAG inputs
• The directional gyro may be slewed to any position at two different speeds. 
• In this case, the SYNC operator does not work because the are not magnetic indicators to synchronize

When MAG is re-selected, the DG will align to magnetic north as received from the MAG Flux at a rapid rate. 

When operating in the DG mode, there is no indication of DG mode operation except for the DG light on the compass control panel. 

Original Flight Hardware: Compass Control Panel

The Compass Control Panels are located on the overhead panel of the Lockheed L-1011. There is a compass control panel for the captain and one for the first officers' instruments. The compass controller has the following elements:

HEADING SET CONTROL SWITCH ... used to slew the compass cards in the MAG or DG modes. First index left of right is for slow alignment. Full over left or right is for fast alignment of sync indicator.



ALIGNMENT SYNC INDICATOR .. Indicates sync condition of gyro and flux valve when operating in the MAG mode.

MAG/DG SWITCH ... When MAG is illuminated the heading system is being supplied magnetic data. DG is illuminated to indicate that heading system is operating as a gyro compass with no magnetic corrections.



Panel Locations