TM 55-1520-240-23-3
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ADJUST ENGINE DROOP ELIMINATOR VARIABLE RESISTORS
(Continued)
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ADJUST RESISTORS FOR EXCESSIVE ROTOR RPM
17.
Have pilot perform Droop Eliminator Flight Check
(TM 55-1520-240-MTF). If rotor rpm is 98 to 100
percent, go to step 29. If not, go to step 18.
18.
Record rotor rpm percent. Subtract rpm percent
from 100 if rpm is 97 percent or less. Subtract
100 from rotor rpm percent if rpm is greater
than 100 percent. Multiply result by 10. Record
number.
18.1.
Install rig pin (T133) (8) in thrust control idler (9).
19.
Connect multimeter (10), set to RX1, to terminals
1 (11) and 2 (12) on No. 1 resistor (13). Record
reading.
20.
Add number recorded in step 18 to reading
recorded in step 19 if rotor rpm is 97 percent or
lower. Subtract number found in step 18 from
reading found in step 19 if rotor rpm is greater
than 100 percent.
21.
Loosen four nuts (14) on resistor shaft (15).
22.
Adjust shaft (15) until multimeter (10) reads
number of ohms equal to number found in step
20.
23.
Tighten four nuts (14) on shaft (15). Torque nuts
to 25 inch-pounds.
24.
Check multimeter (10). If multimeter reads
amount recorded in step 20, go to step 25. If not,
repeat steps 21 thru 24.
25.
Disconnect multimeter (10).
26.
Repeat steps 19 thru 24 on No. 2 resistor (19).
26.1.
Remove rig pin (T133) (8) from thrust control
idler (9).
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