TM 55-1520-240-23-9
11-280
AFCS INTERFACE TEST
(Continued)
11-280
TEST 8
LONGITUDINAL CYCLIC TRIM ACTUATOR OUTPUT
MOTION TEST (BOTH)
NOTE
Forward actuator operates with No. 1
AFCS. To test No. 1 AFCS, perform
steps 37 thru 41.
Aft actuator operates with No. 2
AFCS. To test No. 2 AFCS, perform
steps 37 thru 39 and steps 42 thru 43.
Authority of cyclic trim actuator as
indicated on cyclic trim indicator is
as follows:
FWD and AFT Extend — 150 knots
FWD and AFT Retract — 60 knots
36.
Deleted.
37.
Set ACTUATOR DRIVE LCT switch (17) to OFF.
38.
Set FEEDBACK MONITOR switch (15) to LCT.
Lamp (18) shall come on.
39.
Set AFCS CYCLIC TRIM switch (19) to AUTO.
40.
Set AFCS SYSTEM SEL switch (1) to 1. Hold
ACTUATOR DRIVE LCT switch (17) to RETR
until FWD indicator (20) indicates 60 knots.
40.1.
Hold ACTUATOR DRIVE LCT switch (17) to EXT
until FWD indicator (20) indicates 150 knots.
Note time required for travel from 60 knots to
150 knots. Travel time shall be 15 seconds or
less. Read digital display (6). Indication shall
be -3.14 to -3.78 VDC.
41.
Hold ACTUATOR DRIVE LCT switch (17) to
RETR until FWD indicator (20) indicates 60
knots. Note time required for travel from 150
knots to 60 knots. Travel time shall be 15
secondsor less. Read digital display (6).
Indication shall be 0.00 to -0.38 VDC.
42.
Set AFCS SYSTEM SEL switch (1) to 2. Hold
ACTUATOR DRIVE LCT switch (17) to RETR
until AFT indicator (21) indicates 60 knots.
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