Some years ago I investigated a 212 accident in Indonesia where the oil cooler intake panel departed the aircraft and hit the T/R. The TRGB was broken in half and the a/c flew for about 600 yards before hitting the ground. Pilot was hosipitalised but OK, the engineer in the left seat wasn't so lucky. At that time no one could help us determine how far the a/c could fly without a T/R as we couldn't find it immediately in the jungle of Sumatra, it was later found by the local inhabitants who were well rewarded. I put this in just in case the question comes up again, hopefully not.