MAIN ENGINE STARTING ON AIR BUT TRIPPING IMMEDIATELY :
M/E engine starts but trips immediately. All manuals were in Swedish. All trips checked, OK. It took 6-7 hrs to locate problem. Tripping device gets locked by control AIR, which was getting supplied only at the time of starting. Locking released electrically for tripping engine. Problem was due to less pressure of control air. (7 bar) Service air cuts off after M/E starting. The control air pressure was normalized by cleaning line filters etc. No problem after this. Normal air restored after wards.
Lesson Learnt :
Keep the pneumatic lines and filters clean and dry. PMS has to be religiously followed.