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CABLE THERMOCOUPLE EGT (TT4.95) SEE PROBE THERMOCOUPLE EGT (TT4.95) E CABLES OF THE THERMOCOUPLE EGT (TT4.95) SIDE LEFT AND RIGHT COVER
PROBE (REF) EPR (PT4.95)
(EXAMPLE - 4 AND 10 O'CLOCK POSITIONS) EGT (TT4.95) THERMOCOUPLE PROBE
FSEE PROBE HOUSING F EGT (TT4.95) THERMOCOUPLE CABLE THERMOCOUPLE EGT (TT4.95) SEE PROBE THERMOCOUPLE EGT (TT4.95) C (EXAMPLE - 1 AND 7 O'CLOCK POSITIONS) EGT (TT4.95) THERMOCOUPLE PROBE HARNESS EEC WIRING THERMOCOUPLE EGT (TT4.95) PROBE D THERMOCOUPLE CABLE THE EGT (TT4.95) TERMINAL BOX FOR FWD
PROBE EGT (TT4.95) THERMOCOUPLE
HOUSING THERMOCOUPLE EGT (TT4.95)
EPR (PT4.95) PROBE (REF)
E F
Exhaust Gas Temperature Indicating System - Component Location
Figure 1 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
AUTOTHROT DISC CABIN ALTITUDE OUTFLOW VLV L 1.83 TAT 1.62 REV +23c 1.83 1.001.62 +21c D-T0 1 1.83 1.65 AUTOTHROT DISC CABIN ALTITUDE OUTFLOW VLV L
(11 LINES) EPR (11 LINES)
587 587 97 623 5 P S A L F DOWN FL 250 246-324 GEAR PG 1RECALL SEATBELTS CON IGNITION STATUS KTS N TAI 587 75.6 7 8 17.6 65 105 15 1.22 N1 623587 97 75.6 15.2 83.7 EGT 535 21 81 78 XBN FF OIL P OIL T OIL Q VIB 0.017.6 2 65 105 15 1.2N2 12 103 19 0.5 107 15 1.2N2 N2 15 66 18.3 GEAR PG 1RECALL SEATBELTS CON IGNITION STATUS KTSFL 250 246-324 DOWN P S A L F 5
12 CAB ALT LDG ALT AUTO RATE ~P 7500 DUCT PRESS 12 +250 5.6200 TEMP TOTAL FUEL +10c 345.0 LBS X 1000 12 CAB ALT LDG ALT A RATE ~P 7500 DUCT PRESS 200 12 +250 5.6 TOTAL FUEL TEMP +10c 345.0
MAIN EICAS DISPLAY COMPACTED EICAS DISPLAY
A A OR B
Exhaust Gas Temperature Indication
Figure 2
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A. EGT parameters are shown on the main EICAS display, below the N1 displays. The EICAS display shows EGT readings in a combination of vertical and digital readouts. The normal display color is white. Exceedances are shown in amber and red.
(1)
Readouts in the amber band show that the exhaust gas temperature of the engine is close to the operating limit. If the actual value of the exhaust gas temperature enters the amber band, the vertical and digital readouts become amber in color. During the take-off and go-around modes of flight, the amber band EGT exceedance displays are inhibited for 5 minutes during normal operation, or for 10 minutes if one of the engines is out.
(2)
Readouts in the red band show that the exhaust gas temperature of the engine is more than the operating limit. If the actual value of the exhaust gas temperature enters the red band during engine operation, the vertical and digital readouts will become red in color. If an overtemperature condition occurs, the digital readout stays red until it is reset by pushing the CNCL button. The overlimit indication can be shown again if you push the RCL button. The CNCL and RCL buttons are found on the center EICAS display select panel (AMM 31-61-00/001).
(3)
For more information on EGT indication and EGT exceedances, refer to Integraded Display System, AMM 31-61-00/001.
6. Operation (Fig. 3)
_________
A. Functional Description
(1)
EGT is sensed by parallel alumel and chromel thermocouples in the EGT thermocouple probe. The alumel-chromel junction in each thermocouple generates an EGT-proportional voltage due to heating by the exhaust gases.
(2)
The signal is then sent over the EGT (TT4.95) thermocouple cables to the terminal box for the EGT (TT4.95) thermocouple cable, where the signals are averaged for channel A and channel B.
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