TM 11-6605-202-12/TO 5N3-3-10-1
SECTION II
OPERATIONAL CHECK PROCEDURES
PAGE
SECTION CONTENTS
GENERAL
OPERATIONAL CHECKS
GENERAL
3-3. This section contains instructions for performing operational checks on the compass set. You
should perform these checks concurrent with the operational checks performed on the aircraft in which
the compass set is installed.
The following checks are performed with the external power connected to the aircraft. Refer to the ap-
plicable aircraft organizational maintenance manual for connecting the external power. Perform the
following checks in the order given below.
OPERATIONAL CHECKS
3-4. Power On
a. Turn on the 115-volt, 400 Hz, single-phase aircraft ac power.
b. Using multimeter AN/VRM-105, check that the 400 Hz power is between 107.5 and 119.5v ac.
Power failure indicator on course indicator 1 or power failure meter on course indicator 2 (as ap-
plicable) should disappear.
d. Panel lights on either course indicator 1 or compass controller (as applicable) are lighted.
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