There aren't any charts on Lukla.
The word is the generator failed (if it has 2, both failed) IMC on a VFR flight and by the looks they got spatial disorientation and then CFIT... they would've been IF current and fly IMC regularly.
Why these aircraft continually fly IMC, VRF is beyond me. Completely stupid, add the Himalayas and you can amplify that to the N'th degree. Flying anywhere where the FIS reports SCT GND 015 030 isn't clever, and worse still when the strips at 9000ft IN A VALLEY!
Very sad