NOTE: RIGHT PROBE AND SENSOR SIMILAR.
SENSOR VANE
FWD
FUSELAGE MOUNTING BOLT
SKIN (8 PLACES)
ANGLE OF ATTACK SENSOR, B126, B127
D
Air Data System - Component Location
Figure 102 (Sheet 2)
E17577
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A
747-400 FAULT ISOLATION/MAINT MANUAL
FLIGHT INTERPHONE JACK AND ATTITUDE SENSOR ASSEMBLY (REF)
SEEE F
GEAR DOWN DISPATCH
P7 PANEL
117AL
MAIN EQUIPMENT CENTER
FIFTH ENGINE CARRIAGE
SINGLE DIGIT INPUT SIGNAL MONITER
SWITCH GUARD SWITCH GUARD CONNECTOR TEST
SWITCH SWITCH
NORMAL NORMAL
VMO VMO
GEAR DOWN DISPATCH FIFTH ENGINE CARRIAGE
SWITCH, S1057 SWITCH, S1460
E F
Air Data System - Component Location
Figure 102 (Sheet 3)
P6 PANEL (REF) LEFT ADC TRANSFORMER, T131 RIGHT ADC TRANSFORMER, T132 CENTER ADC TRANSFORMER, T133
ADC SOURCE SELECT RELAYS, R7384, R7385
AIR DATA COMPUTER, B164
E2-3
E1-2
AIR DATA COMPUTER, B163 AIR DATA COMPUTER, B166
SEE G
E1-3
PITOT CONNECTOR
STATIC
CONNECTOR
BALL TYPE
FAILURE
INDICATOR
TEST ONLY FUNCTIONAL
TEST SWITCH
HANDLE
AIR DATA COMPUTER,
B163, B164, B166
G
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A
747-400 MAINTENANCE MANUAL
AIR DATA SYSTEM - ADJUSTMENT/TEST
_________________________________
1. General_______
A. This procedure contains two tasks. The first task is an operational test of the air data system. The second task is a system test of the air data system. The operational test uses the air data system Built-In-Test (BIT) to examine the air data system. The Central Maintenance Computer system control display unit (CDU) operates the air data system Built-In-Test (BIT). The system test examines the air data system with external test equipment. The air data inputs of altitude, airspeed, angle-of-attack (AOA), and total air temperature (TAT) are supplied. System outputs are monitored on displays from the integrated display system (IDS) or an ARINC 429 bus reader.
B. These tests are in the Air Data System - System Test:
-Overspeed Warning and EIU Discrete Interface Test
-Barometric Correction Test
-Angle of Attack Sensor Test
-EIU Switching Test
-TAT Probe Test
-Maximum Operating Speed Test
-Alternate VMO Test
-Probe Heat Interface Test
-Alternate SSEC Test
TASK 34-12-00-715-001
2. Operational Test - Air Data System__________________________________
A. General
(1) The operational test examines the air data system with the ADC BIT through the CDU. The ADCs are examined one ADC at a time. The CDU and the fault monitor on the ADC front panel will give BIT test pass/fail data.
B. References
(1)
24-22-00/201, Manual Control
(2)
31-52-00/501, Aural Warning System
(3)
31-61-00/201, Integrated Display System
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