Raytheon 138-119, Operator'S And Service Manual

Page: 27 / 55

COMPASS
STD22
Change Over Box
138--119
21
3769DOC000002
Edition: April 06, 2005
3.3.1.2 Special features for connected Rate Gyro
It is possible to connect Rate Gyros to the Distribution Units.
Settings for the Rate Gyros can be made at the respective Distribution Unit (scaling) and at
the Operator Unit (selection).
If a connected Rate Gyro fails, the Rate of Turn of the actual selected Gyro is automatically
took over.
The blackout of the external connected Rate Gyro is recognized only at the Operation Unit
in the service menu (see also Operator Unit manual) no.: 3648.
To monitor a blackout of an external connected Rate Gyro, the
respective alarm contact of the Rate Gyro has to be analysed
respectively be connected to an external alarm device.
If the Rate Gyro becomes active again, the Rate of Turn is automatically took over from the
Rate Gyro.
3.3.1.3 Special features for connected NAV Manager/Data Manager
While configuring a NAV Manager/Data Manager it has to pay attention to set for all re-
ceived position and speed data the tests for checksum and header to “ACTIVE”.
If both tests are not active, than faulty data are corrected and are forwarded
as “not faulty”.