(l)
On the P5-4 panel, put the APU GEN switches to the following positions: 1) Left APU GEN to ON 2) Right APU GEN to OFF
(m)
On the P5-8 panel, make sure the left and right LOW PRESSURE lights are OFF.
(n)
On the P5-4 panel, put the BUS TRANS switch to OFF.
(o)
On the P5-8 panel, make sure the right LOW PRESSURE light is ON.
(p)
On the P5-4 panel, put the right APU GEN switch to ON.
(q)
On the P5-8 panel, make sure the following lights:
1) Left LOW PRESSURE OFF
2) Right LOW PRESSURE OFF
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5. Return the airplane to normal
A. Remove electrical power if no longer required (Ref 24-22-0/201).
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GENERATOR CONTROL UNIT BLOCKING DIODE – ADJUSTMENT/TEST
1. General
A. Each generator control unit blocking (GCU) diode (CR910) can be tested by measuring the voltage across the blocking diode circuit.
2. Test
A. Generator Control Unit Test (Meter Test)
(1)
On the P5-13 panel, put the BAT switch in the ON position.
NOTE: Do not use any other electrical power source. If another power source is used, the test results will not be accurate.
(2)
On the P6-4 panel, open the following control generator circuit breakers:
C4 Control Generator No. 1
C5 Control Generator No. 2
C6 Control Generator APU
(3)
On the P5-5 panel, do the following:
(a)
Make sure both BUS OFF and GEN OFF BUS lights are ON.
(b)
Press the APU GEN OFF BUS light and make sure the bus lights are ON.
(4)
On the P6 panel, attach the common (black) lead from the Fluke 87 meter (or equivalent), to the M400 Power System Test module, (-) DC jack.
NOTE: The M400 switches can be in any position for this test.
(5)
On the Fluke 87 meter, do the following steps:
(a)
Select the diode function.
(b)
Attach the red lead to the volt, ohm, diode jack.
(c)
Black lead to the common jack.
WARNING: THE CIRCUIT BREAKERS HAVE ELECTRICAL POWER. DO NOT TOUCH ANY OTHER OBJECTS OR DAMAGE TO EQUIPMENT OR PERSONNEL MAY OCCUR.
(6) Open the P6-4 panel, and attach or touch the red lead to the load side of the following circuit breakers:
C4 Control Generator No. 1
C5 Control Generator No. 2
C6 Control Generator APU
NOTE: The load side of the circuit breaker is the terminal closest to the P6-4 panel hinge line.
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(7) On the Fluke 87, make sure a positive voltage is measured.
(a) Replace the GCU, and repeat test for replacement GCU, if a positive voltage is not measured.
NOTE: A positive voltage is required to indicate the condition of the circuit. The amount of the voltage measured is not a requirement for this test.
(8)
On the Fluke 87 meter, do the following step:
(a) Reverse the leads at the meter.
1) The red lead in the common jack.
2) The black lead in the volt, ohm, diode jack.
(9)
Attach the red lead to the load side of the following circuit breakers:
C4 Control Generator No. 1
C5 Control Generator No. 2
C6 Control Generator APU
(10)
On the Fluke 87 meter, do the following steps:
(a)
Make sure the meter reads OPEN CIRCUIT when attached or touched to each circuit breaker.
(b)
Replace GCU and battery, and repeat test for replacement GCU, if an open circuit is not measured.
(11)
Remove the red lead from the circuit breaker and the black lead from the M400 Power System Test module (-) DC jack.
(12)
Close the P6-4 panel.
(13)
Close circuit breakers C4, C5 and C6.
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