Here are the missions:
http://home.arcor.de/gizzmoe/Chad.zip
Unpack with directories to data\singlemissions\english.
"Chad" starts at dusk, "Chad Noon" at noon. There are three Sunderlands, the first one attacks about 1.5 minutes after mission start, the other two are 3.5nm and 7nm behind the first one. The first aircraft carries depth charges, the others 250kg bombs.