NOTE: If the adapter cable assembly is used, the test cable
____ assembly must be connected to the adapter cable assembly.
(f) AIRPLANES WITH THE ETC; Connect the leads of the electrical cable or adapter cable assembly (46) to the studs of the ETC thermocouple probe.
NOTE: If the adapter cable assembly is used, the test cable
____ assembly must be connected to the adapter cable assembly.
(g) Connect the electrical cable or test cable assembly (46) to the electronic speed switch (44) and the electronic connectors (45).
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(h) When you use the tester for the first time, do a check of the EGT loop resistance as follows: 1) Remove the screws that attach the instrument panel to the
temperature indication circuit. 2) Lift the panel to get access to the components of the temperature indication circuit. 3) Tag and disconnect the wires from the EGT indicator terminals on the rear of the indicator case.
4) Use the wheatstone bridge or the multimeter to find the total resistance of the circuit between (and external to) the indicator and the thermocouple probe. a) The resistance must be 8.000 |0.035 ohms.
5) If the resistance is not in the limits, adjust the variable resistor in the tester to get the correct resistance. 6) Remove the wheatstone bridge or the multimeter.
CAUTION: MAKE SURE YOU CONNECT THE WHITE (CHROMEL) WIRE TO THE
_______ "CR" TERMINAL. MAKE SURE YOU CONNECT THE GREEN (ALUMEL) WIRE TO THE "AL" TERMINAL. THE INCORRECT OPERATION OF THE TESTER CAN OCCUR IF YOU DO NOT CORRECTLY CONNECT THE WIRES.
7) Connect the wires to the temperature indicator terminals. 8) Attach the instrument panel to the tester with the screws.
(i)
Disconnect the electrical connector (37) from the tachometer generator (36).
(j)
Connect the electrical cable or test cable assembly (46) to the tachometer generator (36) and the electrical connector (37).
(k)
Connect the electrical cable or test cable assembly (46) to the tester receptacle (13).
S 725-045
(5) Do the speed test for the governor on the fuel control unit (Fig. 504):
(a) Start the APU (AMM 49-11-00/201).
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
COMBUSTION CHAMBER CAP
FUEL
ATOMIZER
SEE A
CONNECT TEST
SEE B PRESSURE GAGE HERE
(COMPONENT OF GAGE
AND CASE SET)
HIGH PRESSURE FUEL LINE
FUEL
CONTROL
A
UNIT
LOCKNUT
GOVERNOR
ADJUSTMENT
FUELSCREW CONTROL UNIT
JAMNUT
GOVERNOR ADJUSTMENT NUT
FUEL SOLENOID VALVE
ACCELERATION
LIMITER VALVE
ADJUSTMENT SCREW
FUEL SOLENOID
AIRPLANES WITHOUT THE TAFCU
VALVE ACCELERATION
B
LIMITER VALVE ADJUSTMENT SCREW
AIRPLANES WITH THE TAFCU B
Fuel Control Unit Adjustments Figure 504
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(b)
Let the APU operation become stable with no load applied.
1) With no load applied, the APU speed becomes stable at 102.5% rpm maximum as shown on the tester indicator (15).
(c)
APU WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096 AND AIRPLANES WITHOUT THE ETC; If the stable APU speed is not between 101.3% and 102.5% rpm, adjust the governor for the fuel control unit: 1) Do the APU usual shutdown (AMM 49-11-00/201). 2) Use the screwdriver and wrench assembly to loosen the
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