____________ _______ Where: Tbay is in `F.
Cf = (tbay + 460) * (29.92) 529 Pbar Pbar is in IN. HG.
A
737-300/400/500MAINTENANCE MANUAL
(4) To cool the equipment on the electronic racks correctly, a balanced airflow must be supplied through the fixed orifice plates on each shelf. If equipment is not installed on the racks, the orifices in these empty trays are covered with a metering plate or tape. The metering plates or tape must be removed before you install additional equipment to prevent the equipment from overheating.
CAUTION: DO NOT ADD EQUIPMENT OR CHANGE THE ORIFICE OPENING ADJUSTMENTS
_______ WITHOUT YOUR ENGINEERING DEPARTMENT APPROVAL. THE EQUIPMENT ON THE RACKS CAN OVERHEAT IF THE ORIFICE OPENINGS ARE NOT ADJUSTED CORRECTLY.
(5)
The electronic racks have space for additional equipment if it is necessary. When you add more equipment to the rack, the airflow through the orifices could change for the remaining equipment which can cause the equipment to overheat. Before you add more equipment to the racks, make sure your engineering department approves. You must make sure that the orifices are adjusted correctly to supply sufficient airflow to cool all the equipment. Fig. 501 shows the location of equipment cooling racks.
(6)
The performance test makes sure that there is sufficient airflow to cool the equipment.
B. Special Tools and Equipment
(1) C21001-19 Equipment Cooling System Performance Test Set
(recommended)
NOTE: P/N C21001-19 consists of two P/N C21001-14 Probes, a P/N C21001-5 Tube and P/N C21001-4 Tubing in a box. These three P/N's already exist as part of Test Equipment P/N C21001-12 or -16 and may be salvaged if an upgrade to the recommended kit is desired.
use with the items that follow:
(a) 220-02PSI Netech Digimano 2000 Precision Pressure/Vacuum Meter Netech Corporation 60 Bethpage Drive Hicksville, NY 11801 Phone: 516-433-7458 Fax: 516-433-7458
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A 737-300/400/500MAINTENANCE MANUAL
TEST PORT GAGE PRESS IN. H20 GAGE PRESS CORRECTED IN. H20 MIN. ACCEPTABLE PRESS IN. H20 CORRECTED PRESS STATUS
OK LOW OR HIGH
1 2.6
2 1.2
3 1.0
4 2.3
5 1.4
6 1.6
7 1.9
8 0.5
9 0.5
10 0.5
11 0.4
12 0.4
13 0.4
14 0.4
15 0.4
16 0.4
17 0.8
18 0.8
Test Data Sheet
Figure 505
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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