AUXILIARY ANNUNCIATOR PANEL, M10394 (P5) MISCELLANEOUS TEST PANEL, M10398 (P61)
AB
FWD
LEFT ANGLE OF ATTACK PROBE, TS12 ANGLE OF ATTACK PROBE
(RIGHT ANGLE OF ATTACK PROBE, TS13
(EXAMPLE, LEFT SIDE IS SHOWN)
IS ON THE OPPOSITE SIDE)
SEEC C
Angle of Attack Probe Heat - Component Location
Figure 1
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L/R PROBE HEAT TEST RELAY
Left/Right Angle of Attack Probe Heat Schematic Figure 2
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(3)
If one or both engines are operating on the ground, the ENG OUT relay associated with each "on" engine energizes. This provides a path from the 115v ac power source, through the heaters, to ground. The CSRs energize due to current flow in the heaters. This opens the ground path for the AOA lights on the auxiliary annunciator panel. Therefore, on the ground with at least one engine running, both AOA probes are heated by 115v ac power, and neither AOA light on P5 comes on. There is also a message on the EICAS display if an AOA probe heater fails (Ref 31-41-00).
(4)
In the air, the ENG OUT and air/ground relays both provide a path for current flow through the heaters. Probe heating is identical to when at least one engine is operating on the ground. (This is described in the preceding paragraph.) If an AOA probe heater loses power, the associated amber AOA light on P5 comes on. There is also a message on the EICAS display if an AOA probe heater fails (Ref 31-41-00).
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