TM 1-1520-238-23
12-177
12.56.
BLADE DE-ICE CONTROLLER ADJUSTMENT - continued
12.56.5. Adjustment Resistance Determination
a. Determine and record five adjustment resistance values for each main rotor blade (Table I).
(1) Read blade temperature and first heater element resistance recorded.
(2) Find page of Table I listing that heater resistance.
(3) Move up heater resistance column until horizontal with blade temperature.
(4) Record indicated main rotor adjustment resistance.
(5) Repeat steps a.(1) thru a.(4) for each heater element.
EXAMPLE
Blade
Temp.
(C)
Main Rotor Adjustment Resistance (kiloohm)
50.
0.66
0.68
0.70
0.73
0.75
0.77
0.79
0.81
0.83
49.
0.70
0.72
0.74
0.76
0.78
0.80
0.82
0.84
0.86
48.
0.73
0.75
0.77
0.79
0.81
0.83
0.85
0.87
0.89
47.
0.76
0.78
0.81
0.83
0.85
0.87
0.89
0.91
0.93
46.
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
45.
0.83
0.85
0.87
0.89
0.91
0.93
44.
0.91
0.93
0.95
0.96
1.58
1.60
1.62
1.49
1.51
1.53
1.59
1.61
1.64
1.66
25.
1.52
1.55
1.57
1.61
1.63
1.65
1.67
1.69
24.
1.56
1.58
1.60
1.62
1.64
1.67
1.69
1.71
1.73
23.
1.60
1.62
1.64
1.66
1.68
1.70
1.72
1.74
1.76
22.
1.63
1.65
1.67
1.70
1.72
1.74
1.76
1.78
1.80
21.
1.67
1.69
1.71
1.73
1.75
1.77
1.79
1.82
1.84
20.
1.70
1.73
1.75
1.77
1.79
1.81
1.83
1.85
1.87
19.
1.74
1.76
1.78
1.80
1.83
1.85
1.87
1.89
1.91
18.
1.78
1.80
1.82
1.84
1.86
1.88
1.90
1.93
1.95
17.
1.81
1.83
1.86
1.88
1.90
1.92
1.94
1.96
1.98
16.
1.85
1.87
1.89
1.91
1.94
1.96
1.98
2.00
2.02
15.
1.89
1.91
1.93
1.95
1.97
1.99
2.01
2.04
2.06
14.
1.92
1.95
1.97
1.99
2.01
2.03
2.05
2.07
2.09
13.
1.96
1.98
2.00
2.02
2.05
2.07
2.09
2.11
2.13
12.
2.00
2.02
2.04
2.06
2.08
2.10
2.13
2.15
2.17
11.
2.04
2.06
2.08
2.10
2.12
2.14
2.16
2.18
2.21
10.
2.07
2.09
2.12
2.14
2.16
2.18
2.20
2.22
2.24
2.15
2.17
2.22
2.24
2.26
2.28
2.28
2.30
2.96
2.98
3.03
3.05
3.07
-14.
3.00
3.02
3.05
3.07
3.09
3.11
3.16
3.18
-15.
3.04
3.06
3.09
3.11
3.13
3.15
3.18
3.20
3.22
-16.
3.08
3.10
3.13
3.15
3.17
3.19
3.22
3.24
3.26
-17.
3.12
3.15
3.17
3.19
3.21
3.23
3.26
3.28
3.30
-18.
3.16
3.19
3.21
3.23
3.25
3.28
3.30
3.32
3.34
-19.
3.20
3.23
3.25
3.27
3.29
3.32
3.34
3.36
3.38
-20.
3.25
3.27
3.29
3.31
3.34
3.36
3.38
3.40
3.42
11.52
11.53
11.54
11.55
11.56
11.57
11.58
11.59
11.60
Heater Resistance (Ohm)
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