5. Operational Test No. 1 (Preferred)
A. Open left side cowl panel (Ref Chapter 71).
B. Disconnect indicator leads (Chromel - white and Alumel - green) from terminal strip (Fig. 501).
C. Connect Wheatstone Bridge to harness leads and measure circuit resistance (Fig. 502).
D. Take second reading with test leads reversed and obtain average resistance of opposite polarity readings.
E. Adjust load resistance to average measured resistance.
F. Make test connections to indicator leads (Fig. 502). Immerse test connections in ice bath.
G. Apply voltages and observe indicator readings. Lightly tap front of indicator before taking reading.
NOTE: A pointer movement greater than 250C when tapping would be caused by defective indicator.
6. Operational Test No. 2 (Optional)
A. Perform steps 5.A, thru 5.E.
B. Make test connections to indicator leads (Fig. 502).
C. Monitor ambient temperature at test connections.
D. Apply voltages and observe indicator reading in Fig. 502 as adjusted for ambient temperature in Fig. 503.
E. Lightly tap front of indicator before taking reading.
NOTE: A pointer movement greater than 250C when tapping would be caused by defective indicator.
Sep 20/81 77-21-0 Page 505 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Exhaust Gas Temperature Indicating System Operational Test Requirements 501
77-21-0 Figure 502 Sep 20/81
Page 506
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
REFERENCE
TEST POINTS oC
TEMP
oC 0 150 250 450 550 650 750 850
0 0.00 6.13 10.15 18.50 22.77 27.03 31.25 35.35
15 -0.60 5.53 9.55 17.90 22.17 26.43 30.63 34.75
16 -0.64 5.49 9.51 17.86 22.13 26.39 30.59 34.71
17 -0.68 5.45 9.47 17.82 22.09 26.35 30.55 34.67
18 -0.72 5.41 9.43 17.78 22.05 26.31 30.51 34.63
19 -0.76 5.37 9.39 17.74 22.01 26.27 30.47 34.59
20 -0.80 5.33 9.36 17.70 21.97 26.23 30.43 34.55
21 -0.84 5.29 9.31 17.66 21.93 26.19 30.39 34.51
22 -0.88 5.25 9.27 17.62 21.89 26.15 30.35 34.47
23 -0.92 5.21 9.23 17.53 21.85 26.11 30.31 34.43
24 -0.96 5.17 9.19 17.54 21.81 26.07 30.27 34.39
25 -1.00 5.13 9.15 17.50 21.77 26.03 30.23 34.35
26 -1.04 5.09 9.11 17.46 21.73 25.99 30.19 34.31
27 -1.08 5.05 9.07 17.42 21.69 25.95 30.15 34.27
28 -1.12 5.01 9.03 17.38 21.65 25.91 30.11 34.23
29 -1.16 4.97 8.99 17.34 21.61 25.87 30.07 34.19
30 -1.20 4.93 8.95 17.30 21.57 25.83 30.03 34.15
31 -1.24 4.89 8.91 17.26 21.53 25.79 29.99 34.11
32 -1.28 4.85 8.87 17.22 21.49 25.75 29.95 34.07
33 -1.32 4.81 8.83 17.18 21.45 25.71 29.91 34.03
34 -1.36 4.77 8.79 17.14 21.41 25.67 29.87 33.99
35 -1.40 4.72 8.74 17.10 21.36 25.62 29.82 33.94
36 -1.45 4.68 8.70 17.05 21.32 25.58 29.78 33.90
37 -1.49 4.64 8.66 17.01 21.28 25.54 29.74 33.86
38 -1.53 4.60 8.62 16.97 21.24 25.50 29.70 33.82
39 -1.57 4.56 8.58 16.93 21.20 25.46 29.66 33.78
40 -1.61 4.52 8.54 16.89 21.16 25.42 29.62 33.74
NOTE: Millivolt-to-indicated temperature comparisons compensated for ambient conditions.
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