Figure 1
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747-400
MAINTENANCE MANUAL
115V AC BUS 1
____ ENGINE 1 PROBE ANTI-ICE
NOTE: SHOWN, ENGINES 2,3,4 PROBE HEAT SIMILAR
Engine PT2/TT2 Probe Anti-Ice System Schematic Figure 2
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747-400
MAINTENANCE MANUAL
A. Functional Description
(1) On the ground, the PT2/TT2 probe heaters are activated when the N2 indicator for any engine is greater than 50%. When the airplane is in the air, the heaters remain energized at all values of N2.
B. Control
(1) Operation of the engine PT2/TT2 probe anti-ice system is automatic. No control functions are exercised.
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747-400
FAULT ISOLATION/MAINT MANUAL
ENGINE PT2/TT2 PROBE ANTI-ICE SYSTEM
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
CARD - (REF 73-00-00, FIG. 101) ENG 1 EEC/TMC DISCRETES, YMLA2 ENG 2 EEC/TMC DISCRETES, YMLA4 ENG 3 EEC/TMC DISCRETES, YMLA6 ENG 4 EEC/TMC DISCRETES, YMLA8 ENG 1 N2 SPEED, YMLA1 ENG 2 N2 SPEED, YMLA3 ENG 3 N2 SPEED, YMLA5 EMG 4 N2 SPEED, YMLA7CARD - (REF 77-00-00, FIG. 101)
CIRCUIT BREAKERS - 1 FLT COMPT, P6
ENG 1 IDLE CONT/TMC DISCRETES, C10091 1 6F10 *
ENG 2 IDLE CONT/TMC DISCRETES, C10092 1 6E10 *
ENG 3 IDLE CONT/TMC DISCRETES, C10093 1 6D10 *
ENG 4 IDLE CONT/TMC DISCRETES, C10094 1 6C10 *
PROBE HEAT ENG 1, C8665 1 6H19 *
PROBE HEAT ENG 2, C8666 1 6H21 *
PROBE HEAT ENG 3, C8667 1 6H23 *
ENG 1 AIR SENSE, R7557 ENG 2 AIR SENSE, R7558 AIR/GROUND, R7332 ENG 1 PROBE HEAT N2, R7549 ENG 2 PROBE HEAT N2, R7550 RELAY - (REF 31-01-39, FIG. 101) AIR/GROUND, R226 AIR/GROUND, R627 ENG 3 AIR SENSE, R7559 ENG 4 AIR SENSE, R7560 ENG 3 ENG PROBE CURRENT SENSE, R7555 ENG 4 ENG PROBE CURRENT SENSE, R7556 ENG 3 PROBE HEAT N2, R7551 ENG 4 PROBE HEAT N2, R7552 ENG 2 ENG PROBE CURRENT SENSE, R7554 ENG 1 ENG PROBE CURRENT SENSE, R7553 PROBE HEAT ENG 4, C8668 PROBE - (REF 73-00-00, FIG. 101) (PT2/TT2), T867 ENG 1 INLET TOTAL PRESSURE/TEMPERATURE (PT2/TT2), T867 ENG 2 INLET TOTAL PRESSURE/TEMPERATURE (PT2/TT2), T867 ENG 3 INLET TOTAL PRESSURE/TEMPERATURE ENG 4 INLET TOTAL PRESSURE/TEMPERATURE (PT2/TT2), T867 RELAY - (REF 31-01-36, FIG. 101) AIR/GROUND, R777 1 6H25 *
* SEE WDM EQUIPMENT LIST
Engine PT2/TT2 Probe Anti-Ice System - Component Index
Figure 101
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747-400 FAULT ISOLATION/MAINT MANUAL
PT2/TT2 PROBE (REF)
SEE A
P6 PANEL
FLT COMPT
PT2/TT2 PROBE (REF) A
Engine PT2/TT2 Probe Anti-Ice System - Component Location Figure 102
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