(b)
GRD PWR switch
(2)
When the No. 1 generator control unit (GCU) is changed start engine No. 1. When the No. 2 GCU is changed start engine No. 2. (AMM 71-09-100/201).
(3)
On the P5-13 panel, put the AC meter selector switch to the GEN position of the GCU being tested. Make sure the following indications are shown:
(a)
The AC VOLTS meter shows 0 volts.
(b)
The AC FREQ shows 0 Hz.
(4)
On the P5-5 panel, make sure the following lights are OFF:
(a)
LOW OIL PRESSURE
(b)
HIGH OIL TEMP
(5)
On the P5-4 panel, put the GEN switch of the GCU being tested to ON then OFF.
(6)
On the P5-13 panel, push the RESID VOLTS switch, make sure the following is shown:
(a) AC voltmeter shows 10 to 21 volts.
(7)
On the P5-4 panel, make sure the following lights are ON:
(a)
TRANSFER BUS OFF
(b)
BUS OFF
(c)
GEN OFF BUS
(8)
On the P5-4 panel, put the GEN switch of the GCU tested to ON. Make sure the following lights for the generator being tested are OFF:
(a)
TRANSFER BUS OFF
(b)
BUS OFF
(c)
GEN OFF BUS
(9)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts.
(b)
Frequency meter shows 400 ±5 Hz.
(10)
On the P5-4 panel, put the BUS TRANS switch to AUTO, make sure the following lights are OFF:
(a)
Left and right TRANSFER BUS OFF
(b)
Left and right BUS OFF
NOTE: Voltage indicates the control (field) relay has closed.
544
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-81 Page 401
NOTE: The GEN OFF BUS light will remain ON for the engine not being tested.
(11) On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts.
(b)
Frequency meter shows 400 ±5 Hz.
B. Airplanes without electrical load shedding, do the following:
(1)
On the P5-8 panel, put the HYD PUMPS B ELEC 1 and 2 switches ON.
(2)
On the P5-8 panel, make sure the LOW PRESSURE lights are OFF.
(3)
On the P5-13 panel, make sure the following is shown:
(a)
AC voltmeter shows 115 ±5 volts
(b)
Frequency meter shows 400 ±5 Hz.
(4)
On the P5-4 panel, make sure the AC AMPERES shows a current.
(5)
On the P5-5 panel, make sure the following lights for the GCU being tested are OFF:
(a)
LOW OIL PRESSURE
(b)
HIGH OIL TEMP
(6)
Restore airplane to normal.
C. Airplanes with electrical load shedding, on the P5-8 panel, do the following for the GCU tested:
(1)
Put the HYD PUMPS B ELEC switch for the GCU being tested to ON.
(a)
If the No. 1 GCU is tested, put the HYD PUMPS B ELEC 1 switch to ON.
(b)
If the No. 2 GCU is tested, put the HYD PUMPS B ELEC 2 switch to ON.
(2)
Make sure the LOW PRESSURE light is OFF.
(a)
If the No. 1 GCU is tested, the left LOW PRESSURE light is OFF.
(b)
If the No. 2 GCU is tested, the right LOW PRESSURE light is OFF.
(3)
On the P5-5 panel, make sure the following lights are OFF:
(a)
LOW OIL PRESSURE
(b)
HIGH OIL TEMP
(4)
Put the other HYD PUMPS B ELEC switch to ON.
(a)
If the No. 1 GCU is tested, put the HYD PUMPS B ELEC 2 switch to ON.
(b)
If the No. 2 GCU is tested, put the HYD PUMPS B ELEC 1 switch to ON.
(5)
Make sure the LOW PRESSURE light remains ON.
(a)
If the No. 1 GCU is tested, the right LOW PRESSURE light remains ON.
(b)
If the No. 2 GCU is tested, the left LOW PRESSURE light remains ON.
(6)
Put the HYD PUMPS B ELEC switch for the GCU being tested OFF.
(a)
If the No. 1 GCU is tested, put the HYD PUMPS B ELEC 1 switch to OFF.
(b)
If the No. 2 GCU is tested, put the HYD PUMPS B ELEC 2 switch to OFF
(7)
Make sure the LOW PRESSURE light comes ON.
(a)
If the No. 1 GCU is tested, the left LOW PRESSURE light comes ON.
(b)
If the No. 2 GCU is tested, the right LOW PRESSURE light comes ON.
(8)
Make sure the other LOW PRESSURE light goes OFF.
