Page 41 - Volume 10 Number 9

rings. Resistance will vary by how many boots are connected. Verify that there is good continuity. Resistance can also be measured between the two terminals on the brush block assembly with the wires disconnected. Remember that the resistance will vary.
Refer to the following chart for the resistance values.
Temperature Temperature 1 Boot
Range °F Range °C
Min Ohms Max Ohms
0 to 5 -17.8 to -15.0 4.51 4.71
5 to 10 -15.0 to -12.2 4.52 4.72
10 to 15 -12.2 to -9.4 4.54 4.74
15 to 20 -9.4 to -6.7 4.55 4.75
20 to 25 -6.7 to -3.9 4.57 4.77
25 to 30 -3.9 to -1.1 4.58 4.78
30 to 35 -1.1 to 1.7 460 4.80
35 to 40 1.7 to 4.4 4.61 4.81
40 to 45 4.4 to 7.2 4.63 4.83
45 to 50 7.2 to 10.0 4.64 4.84
50 to 55 10.0 to 12.8 4.66 4.86
55 to 60 12.8 to 15.6 4.67 4.87
60 to 65 15.6 to 18.3 4.69 4.89
65 to 70 18.3 to 21.1 4.70 4.90
70 to 75 21.1 to 23.9 4.72 4.92
75 to 80 23.9 to 26.7 4.73 4.93
80 to 85 26.7 to 29.4 4.75 4.95
85 to 90 29.4 to 32.2 4.76 4.96
90 to 95 32.2 to 35.0 4.78 4.98
95 to 100 35.0 to 37.8 4.79 4.99
Note: Ambient air temperature may not represent the de-ice boot temperature. Solar or infrared heating will affect the temperature of the de-ice boot.
De-ice timer check: Connect a 28 VDC lamp to terminal block E21 on the left and right engine. Turn power ON and place the De-Ice switch to AUTO position. The light should illuminate and alternate between the left and right engine approximately every 90 seconds.
ATA 33 – Emergency Exit Sign Bulb Replacement and Alternate Part Number
B300 Series
The FWD and AFT Emergency Exit signs located in the headliner of the Model B300 Super King Air airplane come from the factory with an incandescent lamp, DS1, which can be prone to loosening in its socket due to vibration or burning out. Textron Aviation has approved an LED replacement for this lamp with Part Number E10-WHP. When the lamp is replaced, either with the incandescent or LED Light, Textron Aviation recommends the use of F900 torque seal on one side of the socket to lamp base. This approved material is listed in Chapter 20 Consumable Materials for King Air Models and may be used to secure the lamp in the socket.
SEPTEMBER 2016
KING AIR MAGAZINE • 39