The flight crew knew they were too low. Though they did not have the runway in sight, they had consciously ventured below the minimum descent altitude during a nonprecision approach to Magong, Taiwan.
Runway Safety (approach and landing), Accident Investigation, Causal Factors
Off Course and Below Minimums
Pressing on in a blinding deluge, the pilots were searching for the runway when the ATR 72 impacted a residential area.