What a really interesting read.
The crew used great deduction in mid air to use the alternate cooling fans.
So simple a fix of Stanby pwr to BATT instead of AUTO to bypass the relay. But who would know?
In the heat of the situation as well, for the crew to realise they had no engine fire detection protection is well thought out.
The question I had was to do with LDG Gear unsafe annunciation and PA/ intercom system? Which I think the report doesn't really deal with.
I suppose that the PA and intercom system is powered by BATT Bus but is there no back up to this? Surely this is an essential system which requires two independent power supplies. Possibly Transfer Bus 1 to Standby Bus? There are two supplies to BATT Bus but with one relay able to shut down the Bus there should really be a backup? Also flt deck door runs on DC but why did this become inop? There was still some DC power from TR'S was there not? Or is this run of BATT Bus as well?
Why was there a Nose Gear Unsafe indication? Is this Also the BATT Bus.
Makes you think when the back up to your power supply problems is the item that fails.
Also there doesn't seem to be an answer to do with Cowl valve indication which is DC powered if I remember right
and why power was restored on G/S capture.
Honestly, a job very well done from Flt Crew in very difficult circumstances.
More investigating is needed.
