(2)
Operational Test - Temperature Control System
(3)
Operational Test - 190°F Duct Overheat Switches
B. The system test of the temperature control system does a check for electrical continuity and correct operation of the system components. It is necessary to have the pack valves in the open position to do this test. However, the pack valves will not open without pneumatic pressure. This test does not use pneumatic pressure to open the pack valves. To give a signal that the pack valves are open, it is necessary to disconnect the electrical connector on the side of the pack valve with the visual indicator.
C. The operational test of the temperature control system does a check of the system during normal system operations. To do this test, you must supply electrical power and pneumatic pressure before you can operate the cooling packs.
D. There are two temperature control systems. One temperature control system is for the control cabin. The second temperature control system is for the passenger cabin. These tests will make sure the temperature control system for the control cabin and the passenger cabin operates correctly. You must do the tests for the temperature control systems one system at a time.
E. These tests use heating equipment to do a check of the system components. Refer to 20-10-27/201, Heat Guns, Soldering Guns, Soldering Irons, for the use of the heating equipment before you do these tests.
TASK 21-61-00-705-001
2. System Test - Temperature Control System________________________________________
A. General
(1) This procedure has these tests:
(a)
Manual Mode Test - Temperature Control System (Control Cabin)
(b)
Manual Mode Test - Temperature Control System (Passenger Cabin)
(c)
Automatic Mode Test - Temperature Control System (Control Cabin)
(d)
Automatic Mode Test - Temperature Control System (Passenger Cabin)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-61-00
ALL ú ú 01 Page 501 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
B. Special Tools and Equipment
(1) Temp-Cal Probe Heater BH 3884-40 (attachment to
Jet-Cal engine analyzer) or H294 Temp-Cal Thermal Switch Tester or H394 Temp-Cal Tester with adapter cable BH405
BH24944 Heater Probe Kit (basic P/N)
NOTE: This kit is necessary to use the
____ testers listed above. There are different dash number kits for specific airplane model and tester combinations. Please consult with supplier.
Howell Instruments
3479 West Vickery Blvd.
Fort Worth, Texas 76107
ú (a) Howell Heater Probe BH14130 - used to test overheat switch part ú numbers 67321-26-190, 67321-10-190, 67321-15-250 and ú 67321-27-250. ú (b) Howell Heater Probe BH17336A - used to test overheat switch ú part numbers 1173T183-2 and 1173T212.
(2)
Air velocity measuring instrument, TSI Model 8345 or 1650 Air Velocity/Temperature Meter
NOTE: Model 8345 has replaced Model 1650.
(3)
Controlled cooling source, if ambient temperature is 85°F (30°C) or above.
(4)
Standard thermometer (°F, °C)
C. References
(1)
21-61-71/501, Air Mix Valve Position Indicator Control Unit
(2)
24-22-00/201, Electrical Power
(3)
25-21-45/401, Sculptured Ceiling Panel
(4)
25-52-81/401, Bulkhead Lining
D. Access
(1)
Location Zones
101 Control Cabin - Left
102 Control Cabin - Right
107 Forward Half of Cabin
108 Aft Half of Cabin
210 Air Conditioning Distibution Bay
212 Left Air Conditioning Equipment Bay
214 Right Air Conditioning Equipment Bay
(2)
Access Panels
3303L A/C Access Panel
3403R A/C Access Panel
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