(2)
Ground Test - E/E Detector
(3)
Operational Test - Override Mode Test
(4)
Operational Test - Bypass Valve and Supply/Exhaust Fan Test
(5)
Operational Test - Low Flow Detector Test
(6)
Operational Test - E6/E9 Valve
(7)
System Test - Differental Pressure Switch Test
(8)
System Test - E30 Rack Pressure
(9)
System Test - E1/E2 Rack Pressure
(10)
System Test - CARGO FIRE Switch Test
(11)
System Test - Electrical Test
B. The electrical system test does a check of the equipment cooling system in each mode of operation. The test also includes a check of the overheat switch.
C. The Equipment Cooling ground test includes a check of the clean cycle logic.
D. The Detector Ground Test does a check of the equipment cooling low flow (cooling effect) detectors and the smoke detector (Ref 26-16-51).
E. All circuit breakers for the equipment cooling system must be closed before a test is done.
F. The tests that follow include valve position checks. To find the position of the equipment cooling inboard supply valve, inboard exhaust valve, bypass valve, E6/E9 valve, smoke/override valve, and 3-way valve, look at the position indicator on the valve actuator. The position of the ground exhaust valve must be found by a visual check of the flapper position.
TASK 21-58-00-705-001
2. Ground Test - Equipment Cooling_______________________________
A. General
(1) The ground test for the equipment cooling system commands the equipment cooling card to do a self-test and the equipment cooling system to go to the override mode. When the system is in the override mode, these conditions will occur:
(a) The supply and exhaust fans to stop.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
M03103
Pressure Correction
___________________ BAROMETRIC PRESSURE (IN. HG)
A747-400MAINTENANCE MANUAL
Gage Pressure Correction Chart
Figure 501
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21-58-00
ALL úú 02 Page 502 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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. H O
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 mustbe 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
40 0.99 0.98 0.97 0.96 0.95 0.94 0.93 0.92
45 1.00 0.98 0.97 0.96 0.96 0.95 0.94 0.93
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