RESISTANCE
RESISTANCE
CENTER
EGT BALANCING
WIRE
VERNIER
COURSE
ADJUSTMENT
ADJUSTMENT
TERMINAL TERMINAL
APU Exhaust Gas Temperature Indicating System Adjustment
Figure 501
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(3) Soldering Iron - 500 Watt capacity
B. Access
(1)
Location Zones
101 Control Cabin, LH
205 Electronic Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3804 APU Cowl Door
C. Procedure
S 865-013
(1) Set the switch and the circuit breaker:
(a)
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.
(b)
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
S 015-014
(2) Open the APU cowl door:
(a)
Open the latches for the APU cowl door.
(b)
Open the APU cowl door.
(c)
Connect the door support rods.
S 015-015
CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
(3) Remove the lower shroud:
(a)
Hold the lower shroud and open the shroud latches.
(b)
Remove the lower shroud.
S 035-016
(4) Disconnect the electrical connectors:
(a)
Disconnect the connector D446 from the EGT indicator on the P5 forward overhead panel.
(b)
Disconnect the connector D1102 for the APU engine lead from the EGT receptacle in the upper shroud.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
S 765-017
(5) Do a test of the EGT resistor:
(a) Install a jumper across pin A and pin B of the connector D1102 for the APU engine lead.
NOTE: The jumper must be a copper wire with a resistance
____
less than 0.05 ohms.
(b)
Connect the wheatstone bridge or the multimeter to pin 1 and pin 2 of the connector D446 for the EGT indicator.
(c)
Make sure the connections in the circuit are clean and correctly attached.
(d)
Measure the circuit resistance.
NOTE: The circuit resistance value must agree
____
with Table 501.
~............................................. | Circuit Resistance for the EGT Indicator | | Table 501 | ............................................... | CIRCUIT RESISTANCE | AMBIENT TEMPERATURE | ............................................... | 13.53 |0.05 OHMS | 30°C |5°C | 86°F |9°F | ............................................... | 13.50 |0.05 OHMS | 20°C |5°C | 68°F |9°F | ............................................... | 13.47 |0.05 OHMS | 10°C |5°C | 50°F |9°F | ............................................... | 13.44 |0.05 OHMS | 0°C |5°C | 32°F |9°F | ............................................... | 13.41 |0.05 OHMS | -10°C |5°C | 14°F |9°F | 2....................…............…...........1
S 765-018
(6) If the circuit resistance does not agree with Table 501, adjust the EGT resistor:
(a) Remove the EGT resistor cover.
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