TEST PORT 7
PLENUM
SHELF 5

USE THE HOLE THAT IS THE LARGEST
DISTANCE AWAY FROM THE AIR SOURCE/
PLENUM FOR THE PRESSURE MEASUREMENTS.

ACCESS THE P6-2 PANEL BEHIND
THE FIRST OFFICER'S SEAT.

FROM EFIS
TEST PORT TEN IS LOCATED IN
THE AFT OUTBOARD CORNER OF

SYSTEM (REF 21-58-02/001)

THE PANEL E3 RACK
NOTE: THE HOLES SHOWN IN THE E3 RACK ARE EXAMPLES ONLY.

Equipment Cooling System Test Ports
Figure 502 (Sheet 1)

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A09667
A 737-300/400/500MAINTENANCE MANUAL

E2 RACK

COLLECTION PLENUM
TEST PORT 2

TEST PORT 1
SHELF 1
SHELF 2
TEST PORT 3
USE MOST INBOARD HOLE IN BOTTOM SURFACE, SECOND FROM AFT END

INBD BOTTOM SURFACE, FIFTH FROM AFT END
FWD USE MOST INBOARD HOLE IN
E1 RACK
USE FIRST OPEN HOLE FROM LEFT IN AFT SURFACE
USE MOST FORWARD LEFT HOLE ON SHELF BOTTOM

Equipment Cooling System Test Ports
Figure 502 (Sheet 2)

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A 737-300/400/500MAINTENANCE MANUAL

____ 1. DO NOT USE STATIC PROBENOTE:
2.
 1/8" PLASTIC TUBE 2-3 INCHES INTO END OF SUCTION
 TUBE. DO NOT INSERT TUBE MORE THAN 3 INCHES.

 3.
 MAKE SURE THAT PLASTIC TUBE IS HELD IN SUCH
 A MANNER THAT FINGERS OR HANDS CANNOT
 RESTRICT FLOW AT END OF SUCTION TUBE.

PRESSURE GAGE
Static Pressure Probe and Measurement Methods Figure 503
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 C30659
Pressure Correction
___________________BAROMETRIC PRESSURE (IN. HG)
A737-300/400/500MAINTENANCE MANUAL
Gage Pressure Correction Chart
Figure 504

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1.
Obtain local ambient barometric pressure (Pbar).

2.
Measure E/E bay air temperature (Tbay).

3.
Locate E/E bay temperature on left axis of table and follow row to the column corresponding to the Barometric pressure. Read the correction factor (Cf).

4.
Calculate the corrected pressure (Pcor) as follows:

E/EPcor = P*Cf (Where: P is measured Baypressure) Temp (`F)Example
P = 2.6 IN. HO
2
Pbar = 30.1 IN. HG
Tbay = 46`F
From table: (45`F/30.2 IN. HG) Cf = 0.95
Pcor = 2.6 IN. H2O*0.95 = 2.47 IN. H2O
____For ambient conditions outside the range
NOTE: of the table, the correction factor must be calculated as follows:
10  28.7  29.0  29.3  29.6  29.9  30.2  30.5  30.8 
0.93  0.92  0.91  0.90  0.89  0.88  0.87  0.86 
15  0.94  0.93  0.92  0.91  0.90  0.89  0.88  0.87 
20  0.95  0.94  0.93  0.92  0.91  0.90  0.89  0.88 
25  0.96  0.95  0.94  0.93  0.92  0.91  0.90  0.89 
30  0.97  0.96  0.95  0.94  0.93  0.92  0.91  0.90 
35  0.98  0.97  0.96  0.95  0.94  0.93  0.92  0.91 
　
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