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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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LOW SPEED SYSTEMS CHECK - TM-1-1510-223-MTF0074
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
15.
Engine performance at maximum continuous
power - Perform as required (Section IV).
16. Engine performance at maximum cruise power -
Perform as required (Section IV).
*17. Engine ice vanes - Check operation as follows:
a.
#1 and #2 ICE VANE POWER SELECT
switches (2) - MAIN.
b. #1 and #2 ICE VANE CONTROL switches -
ON.
Check #1 and #2 VANE EXT
annunciators illuminated.
c. Torquemeters - Monitor for approximately a
10% drop in torque with ice vanes
extended.
d. #1 and #2 ICE VANE CONTROL switches -
Retract (up).
e. Torquemeters - Monitor for an increase in
f. ICE VANE CONTR MAIN circuit breakers -
Pull.  Check that #1 and #2 VANE FAIL
annunciator lights illuminate.
g.
#1 and #2 ICE VANE POWER SELECT
switches (2) - STBY. Check that #1 and #2
VANE FAIL annunciator lights extinguish.
h. #1 and #2 ICE VANE CONTROL switches -
ON.  Check that #1 and #2 VANE EXT
annunciators illuminate.
i. #1 and #2 ICE VANE CONTROL switches -
Retract (up).
2-61

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