Spin Tests
I wouldn't want to see the '111 used for spin testing !!!
Usuallualy deliberate spin tests are carried out with a cartridge fired 'anti-spin' parachute fired from the tail of the aircraft - this includes such modern stuff as the F-22; just in case the normal recovery moves don't work out.
This has a 'sling-shot' effect of dragging the aircraft out of the spin rather like a sea-anchor on a boat - over to any Test Pilots reading for a better description please !
In the case of the Hawk, a special 'spin panel' set of instruments was fitted at its' birthplace, Dunsfold, to the company demonstrator / test-bed G-HAWK - ZA101 to aid the pilot.
Obviously a major consideration was ensuring the fuel pumps/feed were able to cope with a spin, including inverted.