Set up a similar test (as your results seemed really odd to me, don't have such weak results when I'm being attacked by 20mm-armed planes
), flat land, vis 50, four T-62M1975, four Warthogs, two attacking from the rear, two from rear-flank. Spotting M981A3, clear view on all T-62's.
1st attack (rear): Two solid hits, one top (No Effect) one Turret front (Tank fired on aircraft, turret was turned rearwards; No effect).
2nd attack (rear): First hit - * damage, second hit * IMMOBILISED.
3rd attack (side-rear): Side hit, destroyed.
4th attack (side-rear): one miss, one No Effect.