757 AMM 飞机维护手册 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(101)

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Component Details (Fig. 1)
_________________
 A.  TAT Probe
 (1)  The TAT probe is located on the right side, halfway down the fuselage, aft of the nose gear. Only one level of TAT probe heating is used.
 B.  Auxiliary Annunciator Panel
 (1)  Auxiliary annunciator panel M10394 is located on pilots' overhead panel P5. The annunciator panel contains an amber TAT probe light. The light comes on to identify a TAT probe heater failure.
 C.  Miscellaneous Test Panel
 (1) Miscellaneous test panel M10398 provides for ground testing of the
 probe heater. The test panel is on right side panel P61.Operation
_________
 A.  Functional Description (Fig. 2)
 (1)  
TAT probe heating is automatically controlled by air/ground relays. The only action initiated from the flight deck is probe heat testing.

 (2)  
On the ground the TAT probe is not heated. The energized air/ground relays open the heater circuit. (The air/ground relays are in right miscellaneous electrical equipment panel P37, and left miscellaneous electrical equipment panel P36.) The condition of the TAT light depends on the right and left ENG OUT relays. (These relays are in P37.)

 (3)  
If both engines are off, the left and right engine speed cards de-energize the ENG OUT relays. This closes a circuit from the TAT light, through the current sensing relay (CSR), to ground, and the TAT light comes on. (The CSR is in P37.)

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A

757
MAINTENANCE MANUAL

AUXILIARY
ANNUNCIATOR
PANEL

MISCELLANEOUS TEST PANEL SEE A
P5 SEE B
P61
FLIGHT COMPARTMENT
TEST
TAT WING
a
ANTI ICE
WINDOW/ PROBE HEAT
AUXILIARY ANNUNCIATOR PANEL (P5)  MISCELLANEOUS TEST PANEL (P61)
A B
THRU AIRFLOW
TOTAL AIR
AIR EXIT TO
ENGINE BLEEDTEMPERATURE
SIDEPORTS
AIR OUTPROBE, TS5001
SEE C SENSING
ELEMENTS ASPIRATED AIRFLOW OUT FROM SENSING ELEMENTS AND FROM PROBE CAVITY
OUTBD
FWD
TOTAL AIR TEMPERATURE PROBE, TS5001
C
Total Air Temperature Probe Heat - Component Location
Figure 1

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