From subsequent media reports accident happened at 18:35LT (GMT -8). Sunset on 27 March was at 20:33LT
Relevant ANC Metars (accident site 40km E of ANC):
PANC 280153Z 34013KT 10SM FEW080 01/M12 A2990 RMK AO2 SLP127 T00061122
PANC 280253Z 34014G20KT 10SM FEW080 01/M12 A2995 RMK AO2 SLP145 T00061117 53042
Data suggests that the usual culprit, granite in them clouds was not in play in this case.