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MAINTENANCE MANUAL
AUXILIARY ANNUNCIATOR PANEL, M10394
SEE A MISCELLANEOUS TEST PANEL,
M10398P5 SEE B
P61
FLIGHT COMPARTMENT
TEST
CAPT
F/O
PITOT a
PITOT a
L AUX
R AUX
PITOT a
WING ANTI ICE PITOT a
WINDOW/ PROBE HEAT
AUXILIARY ANNUNCIATOR PANEL (P5) MISCELLANEOUS TEST PANEL (P61)
A B
CAPTAIN'S PITOT (FIRST OFFICER'S PITOT IS ON THE OPPOSITE SIDE)
SEE C
FUSELAGE SKIN
AIRFLOW
LEFT AUXILIARY PITOT,
FWD
(RIGHT AUXILIARY PITOT
CAPTAIN'S (FIRST OFFICER'S)
IS ON THE OPPOSITE SIDE)
PITOT PROBE
OUTBDSEE C
C
Pitot Probe Anti-Icing - Component Location
Figure 1
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MAINTENANCE MANUAL
CAPT PITOT(F/O PITOT)
PITOT STATIC
28V DC
PROBE HEAT
IND L (R) PITOT
AIRP11CAPT PITOT HT(F/O PITOT HT)
115V AC
CAPT (F/O) MAIN
PITOT HEAT
CAPT (F/O) PITOT CAPT (F/O) PITOT
115V AC
PROBE CURRENT SENSOR
L AUX PITOT HTL (R) AUX PITOT
(R AUX PITOT HT)HEAT
L AUX PITOT(R AUX PITOT)GNDL/R EICAS COMPUTER
P6
SYS 1 (2) AIR/GNDRELAYAIR
AIR
GND
SYS 2 (1) AIR/GNDGND
RELAYSYS 2 (1) AIR/GND
MASTERRELAY
DIM & TEST
AA
TESTCAPT (F/O) PITOT LT
L (R) PROBE TESTRELAY
MASTERDIM & TEST
AA
LEFT (RIGHT) AUX PITOT LTRUNNINGAUXILIARY ANNUNCIATOR PANEL
NOT
RUNNING
L/R ENG OUTRELAY
L (R) AUX PITOT L (R) AUX PITOT
PROBE CURRENT SENSOR
Pitot Probe Anti-Icing Schematic
Figure 2
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MAINTENANCE MANUAL
(3)
If one or both engines are operating on the ground, engine speed card(s) energizes the ENG OUT relay associated with each "on" engine. Each pitot probe heater is then powered by rectified one phase, 115-volt ac power. The air/ground relays, in P36 and P37, complete the circuit through a diode when in the ground position. The CSRs are energized due to current flow in the heaters. This opens the ground path for the pitot lights on the auxiliary annunciator panel. Therefore, on the ground with at least one engine running, each pitot probe heater is powered by rectified 115-volt ac power, and no pitot lights on P5 are on. If a probe heater failure occurs, the associated amber pitot probe light comes on and a pitot message is displayed on the EICAS (Ref 31-41-00).
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