60
40
20
0
-20
-40 400 450
140
104
68
32
-4
-40
600 650
DEGREES CENTIGRADE
DEGREES FAHRANHEIT
500 550
RESISTANCE - OHMS
TAT PROBE
Temperature - Resistance Graph
Figure 501
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34-12-00
ALL ú ú 08 Page 540 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
AIR DATA COMPUTER - REMOVAL/INSTALLATION
________________________________________
1. General
_______
A. This subject contains two tasks. The first task is to remove an air data computer. The second task is to install an air data computer. The second task includes a test of the air data computer installation.
B. The left, the center, and the right air data computers are installed in the main equipment center. The left air data computer is installed on shelf No. 1 of the E1 electronic equipment rack. The center air data computer is installed on shelf No. 3 of the E1 electronic equipment rack. The right air data computer is installed on shelf No. 3 of the E2 electronic equipment rack.
TASK 34-12-01-004-205
2. Air Data Computer Removal
_________________________
A. References
(1) AMM 20-11-22/401, E/E Rack Mounted Components
B. Access
(1) Location Zones 117/118 Electrical and Electronics Compartment
C. Procedure
S 864-208
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
S 864-025
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
S 034-015
CAUTION: DO NOT DISCONNECT THE PITOT-STATIC SYSTEM HOSES WHEN THE SYSTEM
_______ IS NOT AT AMBIENT PRESSURE. THIS CAN CAUSE DAMAGE TO THE AIR DATA COMPUTER.
(3) Disconnect the pitot-static system hoses from the front panel of the air data computer.
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34-12-01
ALL ú ú 05 Page 401 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 024-120
CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE AIR
_______ DATA COMPUTER. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE AIR DATA COMPUTER.
(4) Remove the air data computer from the electronic equipment rack (AMM 20-11-22/401).
TASK 34-12-01-404-206
3. Air Data Computer Installation______________________________
A. General
(1) You do not have to do a leak test when you connect a quick-disconnect fitting. A visual examination of the quick-disconnect for a complete seal is necessary. You must do a leak test when you cannot make sure that the quick-disconnect has a complete seal.
B. References
(1)
AMM 20-11-22/401, E/E Rack Mounted Components
(2)
AMM 24-22-00/201, Manual Control
(3)
AIPC 34-12-01, Fig. 1
C. Access
(1) Location Zones 117/118 Electrical and Electronics Compartment
D. Procedure
S 864-209
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
S 864-146
(2)
Make sure these circuit breakers are open:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
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