Flying in Kathmandu valley with electrical failure/limited instruments and that too in inclement weather is a recipe for disaster.....and sadly that's what happened to Agni Air D-228.
I have flown into/out of Kathmandu with high-performance jet and even in good weather flying the VOR02 approach and IGRIS 1A/B departures demands precision flying leaving narrow margins for error.
I can only imagine what the pilots of the Dornier went through when the generators failed and they had to take decision to return to KTM in IMC with maybe only basic/backup instruments in heavy rain and overcast skies. Add to that the typical turbulence encountered during such weather inside the valley and the consequence is the fate of the the Dornier. No doubt the Captain tried to break the clouds to get some visual reference. Had he been able to do that he could've landed safely with his experience. But it clearly was not his day. The other option to climb to MEA and then divert to another airport is easier said than done. The climb performance of the little propliner, bad weather, limited instruments all these factors may have made him take the decision to land back at Kathmandu......we will never know.