Raytheon 138-119 Operator's And Service Manual page 49

6.7 Magnetic Sonde 1 fails
The Course Monitor function is no longer present.
This error messages "TMC Failure" and "Course Monitor Alarm" can be detached from the
Distribution Unit and forwarded to external alarm devices (detached from the Change over
Box too -- if connected).
To adhere the course monitoring the Change over Switch has to be switched into
position 2. In this case the Distribution Unit 2 is selected and the Course Monitor function is
performed with the Magnetic Sonde connected to Distribution Unit 2.
6.8 Magnetic Sonde 2 fails
The outputs of the active Distribution Unit are forwarded via the Change over Box.
The failed Magnetic Sonde 2 is connected at the Distribution Unit 2.
This fail is not displayed in the normal operating mode.
3769DOC000002
Change Over Box
138- -119
Change over Switch switched into position 2 means
also: there is no redundancy.
43
COMPASS
STD22
Edition: April 06, 2005