WRT to the 'lump' on the seismic 212 (which was used for the Prakla contract in Iran I believe) I suspect that the lump is the counterweight for the probe, but wait to be corrected (SAS do you have any ideas?)
"Thridle" asked that of me.....sorry to say I have no idea what that object might be as I was exiled to the Bush on Alouettes that were usually in very remote places.
The aircraft parked on the pipeline in Egypt was placed there by Gaza Sarkosy following an engine failure at a high hover required during takeoff. Just a few months ago, over a couple of large glasses of fine Scottish Whisky he told me the story when he visited the Goose Bay Tea House.
He still haunts places in Trinidad and he is very much enjoying his retirement.