PRESSURE GAGE
Static Pressure Probe and Measurement Methods Figure 503
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A 737-300/400/500MAINTENANCE MANUAL
PRESSURE CORRECTION METHOD
1.
OBTAIN AMBIENT BAROMETRIC PRESSURE BY SETTING FIELD ELEVATION ON PILOT OR COPILOT ALTIMETER AND READING PRESSURE FROM BAROMETRIC CORRECTION SCALE.
2.
DETERMINE P-AMBIENT FROM GRAPH NO. 1. ENTER GRAPH NO. 1 WITH TEMPERATURE OF ELECTRICAL/ELECTRONICS COMPARTMENT AND AMBIENT BAROMETRIC PRESSURE. READ P-AMBIENT.
0.09
3.
ENTER GRAPH NO. 2 WITH PRESSURE READ AT TEST PORT AND P-AMBIENT. READ CORRECTED PRESSURE AT TEST PORT
4.
EXAMBLE: TEMPERATURE E/E COMPT-100`F AMBIENT PRESSURE = 28 IN. HG. PRESSURE READING AT TEST PORT = 3 IN. H O.
2
. FROM GRAPH NO. 1, P-AMBIENT = 0.0665
. FROM GRAPH NO. 2, CORRECTED NEGATIVE PRESSURE = 3.45 IN. H O
2
0.08
0.07
0.0665
0.06
0.05
3
P-AMBIENT (LB/FT )
TEMPERATURE - E/E BAY AMBIENT (`F) GRAPH NO. 1 Gage Pressure Correction Graphs Figure 504 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
NEGATIVE PRESSURE - IN. H O (GAGE)
2 GRAPH NO. 2 Gage Pressure Correction Graphs Figure 504 (Sheet 2)
.055
.06
.065
.07
.075 .08 .085
3
P-AMBIENT (LB/FT )
CORRECTED PRESSURE (IN. H O)
2
4.0
3.45
3.0
2.0
1.0
0
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A 737-300/400/500MAINTENANCE MANUAL
PORT TEST IN. H20 PRESS GAGE IN. H20 CORRECTED PRESS GAGE IN. H20 PRESS ACCEPTABLE MIN. PRESS STATUS CORRECTED
OK HIGH LOW OR
1 2.6
2 0.5
3 1.0
4 2.3
5 1.0
6 0.8
7 2.1
8 0.5
9 0.5
10 0.8
11 0.4
12 0.4
13 0.4
14 0.4
15 0.4
16 0.4
17 0.4
18 0.4
19 1.0
20 1.0
21 (IRU-1) 1.4
22 (IRU-2) 1.4
Test Data Sheet
Figure 505
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B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
Special Tools and Equipment
(1) C21001-16 Equipment Cooling System Performance Test Set (recommended)
C21001-1 Equipment Cooling System Performance Test Set
(alternative)
or items (a) thru (d) listed below (alternative):
(a)
510e Digital Pressure Gage (alternative)
MPM500e Digital Pressure Gage (alternative)
Solomat Instrumentation Division
Stamford, CT 06906
FA141710 Portable differential Pressure Gage - 0 to 10 inches of water (alternative) Wallace and Tiernan Belleville, NJ
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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