ATR 42-300
AIRCRAFT HANDLING MANUAL
AIRCRAFT SERVICING
3.3.3 CONNECTING EXTERNAL POWER, FLIGHT DECK UNMANNED
Before connecting external power, according to the procedure below, you must be aware of the
WARNINGS
and
CAUTIONS
as described in
3.3 EXTERNAL POWER.
Follow these steps to connect external power to the aircraft:
Externally.
Steps 1 – 4 are performed externally
Step
Action
1
Make sure the GPU is switched off electrically.
2
Inspect the external power cable connector and cable for damage.
3
Check that the aircraft is properly chocked and:
Open the DC external power access door
Connect the external power cable connector to the DC external
power receptacle
Make sure the cable connector is fully engaged.
4
Switch on the GPU electrically and check that:
The white “DC Connected” light comes on
Flight deck.
Steps 5 to 7 is performed on the flight deck
5
Check that the green “EXT PWR AVAIL” light is on.
If neither light is on, call maintenance or the Commander for assistance.
6
Place the “BAT” toggle switch in the “ON” position
7
Push the “EXT PWR” pushbutton and check that the switch-light comes
on.
3.3.4 DISCONNECTING EXTERNAL POWER, FLIGHT DECK UNMANNED
Before disconnecting external power, according to the procedure below, you must be aware of the
WARNINGS
and
CAUTIONS
as described in
3.3 EXTERNAL POWER.
Follow these steps to disconnect external power from the aircraft:
Flight deck.
Steps 1-3 are performed on the flight deck
Step
Action
1
Push the “EXT PWR” pushbutton and check that the switch-light
goes off.
2
Check that the red “INV FAULT” light is on.
3
Place the “BAT” toggle switch in the “OFF” position and check that
“EXT PWR” pushbutton illuminates green “AVAIL” light.
Externally.
Steps 4 to 8` are performed externally
4
Switch off the GPU electrically and check that:
The white “DC CNCTD” light is out.
5
Disconnect the external power cable connector.
6
Close the DC external power access door
7
Stow the external power cable and cable connector on the GPU.
8
Shut down the GPU (when applicable).
