Wondering where the pilot derived the 970' which was set in the MCP?
As quoted in Footnote 4 on Page 1:
The minimum descent altitude (MDA) for the approach was 760 ft. However, a Notice to Airmen (NOTAM) current at the time raised the MDA to 920 ft because of crane operations beneath the approach path. The operator advised that ‘the pilots added approximately 50 feet to the MDA due to [a] CANPA [constant angle non-precision approach] requirement’.