787 Ground Test Enable.
I have noticed on one or two occasions of pilots using this switch to enable operation of the air con during turn rounds when only two GPU stingers are attached.
After about 20 minutes or so the GPU supply tends to give up and the a/c is plunged in to darkness. With all the inconvenience and delay that goes with clearing spurious status messages.
Normally three GPUs or APU is required to run the CACs. Safely.
Is this practice becoming common?
Please desist, it's getting to be annoying.