(b)
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
(2)
Remove the EGT indicator:
(a)
Turn the clamping screw counterclockwise to loosen the EGT indicator.
(b)
Pull the EGT indicator out of the panel.
(c)
Disconnect the electrical plug from the EGT indicator.
3. Exhaust Gas Temperature Indicator Installation (Fig. 401)
A. Procedure
(1) Install the EGT indicator: (Ref 49-11-00)
(a)
Connect the electrical plug to the EGT indicator.
(b)
Push the EGT indicator into the panel.
(c)
Turn the clamping screw clockwise to tighten the EGT indicator.
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49-71-12 Figure 401 May 01/98
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(2)
Set the circuit breaker and the switch:
(a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
1) E3-3 Electrical Shelf, APU Control Unit
(b)
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
(3)
Start and operate the APU for a minimum of five minutes (Ref 49-11-00/201).
(4)
Look at the EGT indicator.
(a) The temperature on the EGT indicator increases and becomes stable during the APU operation.
(5)
Shut down APU (Ref 49-11-00/201).
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EXHAUST GAS TEMPERATURE THERMOCOUPLE PROBE - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Antiseize Compound - Fel -Pro C-5, Felt Products Corp., Chicago, Illinois, or equivalent
2. Prepare for Exhaust Gas Temperature Thermocouple Probe Removal
A. Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in work."
B. Open the circuit breaker on M280 module -APU accessory unit on E3-3 electronic shelf.
C. Open APU compartment access door latches and open access door. Install door support rods.
D. Support lower shroud, open shroud latches, and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
3. Remove Exhaust Gas Temperature Thermocouple Probe
A. Disconnect leads from thermocouple probe terminals. (See figure 401.)
B. Remove thermocouple probe attaching bolts and washers.
C. Withdraw thermocouple probe from turbine exhaust port flange.
4. Install Exhaust Gas Temperature Thermocouple Probe
A. Test thermocouple probe operation. Refer to Exhaust Gas Temperature Thermocouple Probe -Adjustment/Test.
B. Insert thermocouple probe in turbine exhaust port flange so that smaller (chromel) terminal on probe is facing aft. (See figure 401.)
C. Coat threads of thermocouple probe attaching bolts with antiseize compound. Install bolts with washers.
D. Connect alumel (green) lead to thermocouple probe larger terminal and chromel (white) lead to smaller terminal.
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5. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU access door support rods and stow rods. Close and latch access door.
C. Close the circuit breaker on M280 module -APU accessory unit on E3-3 electronic shelf.
D. Position BATTERY SWITCH to ON and remove placards.
500
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EXHAUST GAS TEMPERATURE THERMOCOUPLE PROBE - ADJUSTMENT/TEST
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