(a)
If the No. 1 GCU is tested, the right LOW PRESSURE light goes OFF.
(b)
If the No. 2 GCU is tested, the left LOW PRESSURE light goes OFF.
4. Test APU Generator Control Unit
A. Test APU Generator and Control
(1)
Start the APU (AMM 49-11-0/201).
(2)
On the P5-4 panel, make sure the GRD PWR switch is OFF.
(3)
On the P5-13 panel, put the AC meter selector switch to the APU position.
(4)
On the APU control panel the following lights are OFF:
(a)
LOW OIL QUANTITY
(b)
LOW OIL PRESSURE
(c)
HIGH OIL TEMP
(d)
OVER SPEED
(5)
The APU AC AMPERES meter shows no current.
(6)
On the P5-4 panel, make sure the following lights are ON:
(a)
APU GEN OFF BUS
(b)
TRANSFER BUS OFF
(c)
Left BUS OFF
(d)
GEN BUS OFF
(7)
On the P5-4 panel, put the left APU GEN switch to ON.
(8)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts.
(b)
Frequency meter shows 400 +10/-5 Hz.
(9)
On the P5-4 panel, make sure the following lights are OFF:
(a)
APU GEN OFF BUS
(b)
TRANSFER BUS OFF
(c)
Left BUS OFF
(d)
GEN BUS OFF
(10)
On the P5-8 panel, put the HYD PUMPS B ELEC 1 switch to ON.
(11)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts.
(b)
Frequency meter shows 400 +10/-5 Hz.
(12)
Make sure the AC AMPERES shows current.
(13)
On the P5-8 panel, put the HYD PUMPS B ELEC 1 switch to OFF.
(14)
On the P5-4 panel, put the left APU GEN switch to OFF.
(15)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 0 volts.
(b)
Frequency meter shows 0 Hz.
(16)
On the P5-4 panel, make sure the following lights are ON:
(a)
APU GEN OFF BUS
(b)
TRANSFER BUS OFF
(c)
Right BUS OFF
(d)
GEN BUS OFF
(17)
Make sure the APU AC AMPERES meter shows no current.
(18)
On the P5-4 panel, put the right APU GEN switch to ON.
(19)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts.
(b)
Frequency meter shows 400 +10/-5 volts.
(20)
On the P5-4 panel, make sure the following lights are OFF:
(a)
APU GEN OFF BUS
(b)
TRANSFER BUS OFF
(c)
Right BUS OFF
(d)
GEN BUS OFF
(21)
On the P5-8 panel, put the HYD PUMPS B ELEC 2 switch to ON.
(22)
Make sure the AC AMPERES shows current.
(23)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts
(b)
Frequency meter shows 400 +10/-5 Hz.
(24)
On the P5-8 panel, put the HYD PUMPS B ELEC 2 switch to OFF.
(25)
On the P5-4 panel, put the right APU GEN switch to OFF.
(26)
On the P5-4 panel, make sure the following lights are ON:
(a)
APU GEN OFF BUS
(b)
TRANSFER BUS OFF
(c)
Right BUS OFF
(d)
GEN BUS OFF
(27)
Airplanes with electrical load shedding, do the B Hydraulic System Power Source Transfer With APU Operating Test (AMM 24-21-0/501).
(28)
Airplanes without electrical load shedding, do the following:
(a)
On the P5-4 panel, put both APU GEN switches to ON.
(b)
Make sure the following lights on the P5-4 panel are OFF: 1) APU GEN OFF BUS 2) Left and right TRANSFER BUS OFF 3) Left and right BUS OFF
(c)
Make sure the following lights on the P5-4 panel are ON: 1) Left and right GEN BUS OFF
(d)
On the P5-8 panel, put both HYD PUMPS B ELEC 1 and ELEC 2 switches to ON.
(e)
On the P5-8 panel, make sure the following lights are OFF: 1) Left and right OVERHEAT 2) Left and right LOW PRESSURE
(f)
On the P5-4 panel, put the left APU GEN switch to OFF.
(g)
On the P5-8 panel, make sure the left LOW PRESSURE light is OFF.
(h)
On the P5-4 panel, put the BUS TRANS switch to OFF.
(i)
On the P5-8 panel, make sure the left LOW PRESSURE light is ON.
(j)
On the P5-4 panel, put the BUS TRANS switch to AUTO.
(k)
On the P5-8 panel, make sure the left LOW PRESSURE light goes OFF.
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