757 AMM 飞机维护手册 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(94)

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Component Details (Fig. 1)
_________________
 A.  AOA Probes
 (1)  
One AOA probe is located on each side, halfway down the fuselage under the left and right No. 2 flight deck windows. Each AOA probe has a vane heater and a case heater. The vane is heated to maintain an efficient vane airfoil. The case is heated to ensure free rotation of the vane. Only one level of AOA probe heating is used both on the ground and in flight.

 (2)  
The vane and case heaters are independently wired to enable positive fault detection in the vane heater circuit.

 B.  Auxiliary Annunciator Panel
 (1)  Auxiliary annunciator panel M10394 is located on pilots' overhead panel P5. The annunciator panel contains two amber lights, one for each AOA probe. The lights are identified as: L AOA, R AOA. These lights come on to identify a probe heater or system failure.
 C.  Miscellaneous Test Panel
 (1) Miscellaneous test panel M10398 provides for ground testing of the
 probe heaters. The test panel is on right side panel P61.Operation
_________
 A.  Functional Description (Fig. 2)
 (1)  
AOA probe heating is automatically controlled. This is done by action of air/ground relays, and relays whose position depends on engine speed from engine speed cards. The only action initiated from the flight deck is probe heat testing.

 (2)  
On the ground, AOA probe heating depends on engine speed. The air/ground relays will be energized to the ground position. This opens the probe heating circuit. (The air/ground relays are in left miscellaneous relay panel P36, and right miscellaneous electrical equipment panel P37.) If both engines are off, the left and right engine speed cards de-energize the ENG OUT relays. (Two ENG OUT relays are in P36 and P37.) The probe heating circuit remains open. The probes are not heated. This results in the current sensing relay (CSR) associated with each AOA probe to be de-energized. (The CSR associated with the left AOA probe is in P33. The CSR associated with the right AOA probe is in P37.) This provides a closed path to ground for the AOA lights on the auxiliary annunciator panel. Therefore, on the ground with engines off, neither AOA probe is heated, and both amber AOA lights on P5 are on.

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A

757 MAINTENANCE MANUAL
AUXILIARY ANNUNCIATOR PANEL, M10394
SEE A  MISCELLANEOUS
TEST PANEL,
M10398P5 SEE B
P61
FLIGHT COMPARTMENT
TEST 
AIR DATA  CONFIG 
　
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