(a) At the same time, make sure that the load indication on the APU generator ammeter does not increase.
S 865-032
(5) Push the APU GEN No. 2 switch to OFF.
(a) Make sure that these lights come on:
1) APU GEN OFF BUS
2) BUS OFF No. 2
3) TRANSFER BUS OFF No. 1 and No. 2
S 865-033
(6) Push the APU GEN No. 1 switch to ON.
(a) Make sure that these lights go off:
1) APU GEN OFF BUS
2) BUS OFF No. 1
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A
737-300/400/500MAINTENANCE MANUAL
3) TRANSFER BUS OFF No. 1 and No. 2
S 765-034
(7) Look at the load on the APU generator.
(a)
Look at the APU generator ammeter.
(b)
Turn the left switch S2 on the M400 to A, then B, then C.
(c)
Make sure that the APU generator ammeter shows a load for all three switch positions.
(d)
Turn the left switch S2 to position B.
S 865-035
(8) Look at the APU generator ammeter and push the APU GEN No. 2 switch to ON.
(a) At the same time, make sure that the load indication on the APU generator ammeter does not increase.
S 865-036
(9)
Release the GROUND SENSING test switch.
S 415-037
(10)
Close the forward access door.
S 865-038
(11)
Look at the APU generator ammeter and push the APU GEN No. 2 switch to ON.
(a)
At the same time, make sure that the load indication on the APU generator ammeter increases.
(b)
Make sure that the BUS OFF No. 2 light goes off.
K.
Do a Power Transfer from the APU Generator to External Power.
S 865-039
(1) Push the GRD PWR switch on the P5-4 panel to ON.
(a) Make sure that the APU GEN OFF BUS light comes on.
S 765-040
(2)
Look at the quality of the external power with loads.
(a)
Turn the ac meters switch to GRD PWR.
(b)
Make sure that the ac voltmeter shows 115 | 5 volts.
(c)
Make sure that the frequency meter shows 400 | 5 Hz.
L.
Do a Test of the Control Circuits for the External Power.
S 865-041
(1) Push the APU GEN No. 1 switch to ON.
(a) Make sure that the APU GEN OFF BUS light goes off.
S 865-042
(2) Push the APU GEN No. 1 switch to OFF.
(a) Make sure that the APU GEN OFF BUS and BUS OFF No. 1 lights come on.
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A 737-300/400/500MAINTENANCE MANUAL
S 865-043
(3) Push the BUS TRANS switch to OFF.
(a) Make sure that the TRANSFER BUS OFF No. 1 light comes on.
S 865-044
(4) Push the GRD PWR switch to ON.
(a) Make sure that the TRANSFER BUS OFF No. 1 light goes off.
S 865-045
(5) Push the APU GEN No. 2 switch to ON.
(a) Make sure that the APU GEN OFF BUS light goes off.
S 865-046
(6) Push the APU GEN No. 2 switch to OFF.
(a) Make sure that these lights come on:
1) APU GEN OFF BUS
2) BUS OFF No. 2
3) TRANSFER BUS OFF No. 2
S 865-047
(7) Push the BUS TRANS switch to AUTO.
(a) Make sure that the TRANSFER BUS OFF No. 2 light goes off.
S 865-048
(8) Push the GRD PWR switch to ON.
(a) Make sure that the BUS OFF No. 2 light goes off.
M. Do a Power Transfer from the External Power to the APU Generator Power.
S 865-049
(1) Look at the APU generator ammeter and push the APU GEN No. 1 switch to ON.
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