TM 55-1520-240-23-9
11-280
AFCS INTERFACE TEST
(Continued)
11-280
TEST 19
HORIZONTAL SITUATION INDICATOR HEADING
TEST (BOTH)
125.1. Set AFCS SYSTEM SEL switch (1) to 1 or 2.
(System under test.)
126.
Set METER SOURCE switch (3) to GYRO TEST.
127.
Set GYRO TEST SIGNAL MONITOR switch (41)
to HDG ERR.
128.
Set GYRO TEST SIGNAL MONITOR switch (42)
to XY.
129.
Set COMPASS switch (46) to SLAVED.
130.
Push and rotate PUSH TO SET switch (47). Set
compass card (48) to 0º.
131.
Rotate CRS switch (49). Set pointer (50) to 0º.
132.
Rotate HDG switch (51) and set bug (52) to 30º.
Keep compass card (48) at 0º. Read digital
display (6). Reading shall be -10.25 to -12.25
VAC.
133.
Rotate HDG switch (51) and set bug (52) to 345º.
Keep compass card (48) at 0º. Read digital
display (6). Reading shall be +4.8 to +6.8 VAC.
END HORIZONTAL INDICATOR
HEADING TEST (BOTH)
11-1192
