Low and Slow
I think you may be combining two, or possibly three Chinook accidents in the Falklands during the mid to late 1980's
The first involved what was described by some as a very powerful visual illusion, causing an aircraft to fly into the side of a hill.
The second was during an aircraft's first transition into forward flight after a major service. The aircraft struck the ground in a vertical dive, from 500' on a lovely sunny day. The cause was never positively determined.
The third was an aircraft which tore itself to shreds on the apron at RAF Mount Pleasant in a low hover due to a faulty gearbox causing the rotors to desync. This incident occured 24 hours after an identical catastrophy to another RAF aircraft at RAF Odiham. (Or possibly before, can't quite recall)
Only then, did the Airships (presumably rather embarrassed at their carelessness in losing two big toys in 24 hrs) think it best to sort things out before allowing any more losses. Sqn pilots were not unhappy to hear this point of view!
This of course is not to mention another fatal accident in Hannover during the same period, or indeed the Mull.
Chinooks - Don't you just love 'em.
[This message has been edited by Tandemrotor (edited 07 September 2000).]