TM 55-1520-240-23-9
11-280
AFCS INTERFACE TEST
(Continued)
11-280
TEST 14
VERTICAL GYRO VALIDITY TEST (BOTH)
84.
Set AFCS SYSTEM SEL switch (1) to 1 or 2.
(System under test.)
85.
Set METER SOURCE switch (3) to DISCRETE
MONITOR.
86.
Set DISCRETE SIGNAL MONITOR switch (34)
to SEL 2 and SIGNAL SEL 2 switch (35) to VERT
GYRO VALID. Check gyro indicator OFF flag
(36). Flag shall disappear. Read digital display
(6). Reading shall be -0.5 to +0.5 VDC. STATUS
A light (37) shall come on.
87.
Open VGI circuit breaker (38) (if system #2 is
under test, pilot side or copilot side for #1 sys).
Read digital display (6). Reading shall be +4.0 to
+6.0 VDC. STATUS A light (37) shall go out and
STATUS B light (39) shall come on.
88.
Close VGI circuit breaker (38). (System under
test.) STATUS B light (39) shall go out and
STATUS A light (37) shall come on.
END VERTICAL GYRO VALIDITY TEST (BOTH)
11-1187
