S 865-048
(3) Open 6D34, PROBE HEAT IND L and 6C33, AOA HEAT L circuit breakers on the P6, Main Power Distribution Panel.
M. Right AOA Probe Heat Test
S 865-049
(1) Close 6D35, PROBE HEAT IND R and 6C34, AOA HEAT R circuit breakers on the P6, Main Power Distribution Panel.
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747-400 MAINTENANCE MANUAL
S 715-050
(2) Make sure that the right AOA sensor vane heater operates:
(a)
Make sure that the EICAS advisory message HEAT R AOA shows.
(b)
Make sure that the right AOA vane temperature does not increase.
(c)
Open 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.
(d)
Make sure that the EICAS advisory message HEAT R AOA does not show.
(e)
Make sure that the right AOA vane temperature increases.
(f)
Close 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.
N. Put the Airplane to its Initial Condition
S 865-063
(1)
Set the FUEL CONTROL 1, switch on the P8, control stand to CUTOFF.
S 865-079
(2)
Close these circuit breakers on the P6, Main Power Distribution Panel:
(a)
6F1, IGN 1 ENG 1
(b)
6K19, IGN 2 ENG 1
(c)
6G19, STBY IGN ENG 1
S 445-057
(3)
Do this task: "Put Safety-Sensitive Systems Back to the Condition before Air Mode Simulation" (AMM 32-09-02/201).
S 865-051
(4)
Close these circuit breakers on the P6, Main Power Distribution Panel:
(a)
6D34, PROBE HEAT IND L
(b)
6D30, PROBE HEAT PITOT L
(c)
6D31, PROBE HEAT PITOT R
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(d)
6D32, PROBE HEAT AUX PITOT L
(e)
6D33, PROBE HEAT AUX PITOT R
(f)
6D28, PROBE HEAT TAT L
(g)
6D29, PROBE HEAT TAT R
(h)
6C33, AOA HEAT L
(i)
6H19, PROBE HEAT ENG 1
(j)
6H21, PROBE HEAT ENG 2
(k)
6H23, PROBE HEAT ENG 3
(l)
6H25, PROBE HEAT ENG 4
S 865-053
(5)
Remove electrical power (AMM 24-22-00/201).
(6)
Install protective covers on probes after they become cool.
S 415-054
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ENGINE PROBE PT2/TT2 ANTI-ICE SYSTEM - DESCRIPTION AND OPERATION
________________________________________________________________
1. General (Fig. 1)_______
A. An electric heater is built in to the electronic engine control (EEC) PT2/TT2 probe on each engine to prevent ice formation. The engine PT2/TT2 probe anti-ice system consists of the probe heaters and the system relays which are located in the P414 and P415 Power Distribution Centers. The heaters are powered by 115 volts ac through circuit breakers on the P6 panel. System relays are powered by 28 volts dc through circuit breakers on the P6 panel.
B. Each PT2/TT2 probe is located near the 1 o'clock position of the engine inlet cowl inner surface and measures the total temperature and pressure of the airflow entering the engine (AMM 73-21-00). The probe heater is a hermetically sealed resistance element brazed internally into the probe housing. Heater power consumption is a maximum of 475 watts.
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