(2)
Move blower selector switch on overhead panel to NORMAL.
(3)
Check that the following circuit breakers on panel P18 are closed:
(a)
EQUIP COOLING CONT
(b)
BLOWER NORMAL
(c)
BLOWER ALTERNATE
(4)
Check that main blower starts and flow control valve is open.
NOTE: For checking flow control valve position, either observe valve position indicator or check for airflow at exhaust port.
(5)
Open BLOWER NORMAL circuit breaker. Check that main blower stops, EQUIP COOLING OFF amber light comes on within 10 minutes and master caution annunciator on light shield comes on.
(6)
Close BLOWER NORMAL circuit breaker. Check that main blower starts and EQUIP COOLING OFF light goes off within 5 minutes. revbar
(7)
Move blower selector switch on overhead panel to ALTERNATE.
(8)
Check that alternate blower starts.
(9)
Open BLOWER ALTERNATE circuit breaker. Check that alternate blower stops and EQUIP COOLING OFF light comes on within 10 minutes.
(10)
Close BLOWER ALTERNATE circuit breaker. Check that alternate blower starts and EQUIP COOLING OFF light goes off within 5 minutes.
(11)
On Passenger/Cargo Convertible Airplanes, check smoke clearance relay operation.
(a)
Move smoke clearance switch to P/C PRESS and check that main blower stops.
(b)
Move smoke clearance switch to NORMAL and check that main blower starts.
(12)
Remove electrical power if no longer required.
519
Feb 20/90 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-58-0 Page 501
3. Equipment Cooling System Performance Test
A. General
(1)
In order to check performance of the equipment cooling system it is necessary to measure system pressure in a number of key locations, correct these readings for ambient temperature and pressure, then compare the corrected pressures to a standard for each test port location.
(2)
Figure 502 locates all of the test ports and provides instructions for drilling ports if required. Ports already drilled will be covered by an aluminum foil marker also shown in Fig. 502.
(3)
Figure 503 provides instructions for using the test equipment. Figure 504 provides a chart for correcting gage pressure readings for ambient pressure and temperature. Figure 505 lists corrected pressures and their limits for a normal operating system. Figure 505 also shows one method in which data may be compiled and evaluated. Pressure readings as well as the nominal pressures listed on the data sheet are actually negative with respect to field pressure. They are listed as positive for simplicity.
B. Equipment and Materials
(1)
Equipment Cooling System Performance Test Set - F80237-1, C21001-( ) or items (2) thru
(6) listed below.
(2)
Portable differential pressure gage - 0 to 10 inches of water; Wallace and Tiernan Model FA141710; Belleville, New Jersey
(3)
Static pressure probe - United Sensor and Control Corp., 85 School Street, Watertown, Massachusetts; P/N PSC 8
(4)
Hypodermic probe - Make from Liemar Needle, P/N 1261 or 1499 Becton-Dickinson and Company, Stanley St., Rutherford, New Jersey 07073
NOTE: Cut off Luer Lok end to mate with 1/8 ID tubing.
(5)
Thermometer - 0 to 160°F range with accuracy to +2°F
(6)
Plastic tubing - 1/8 inch ID, approximately 3 feet
(7)
Aluminum Foil Marker - BAC27DEX2015
554
21-58-0 Page 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/00
502 Equipment Cooling Rack Location
Dec 15/70 Figure 501 21-58-0
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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