All UK military Nimrod MR2 aircraft have been grounded as a precautionary measure after a routine safety check uncovered a dent in a fuel pipe.
The decision was taken in the last 48 hours after checks on one aircraft, the Ministry of Defence has said.
The fleet was grounded while the issue is investigated but some of the aircraft have already been cleared.
It said an inquiry into the crash of an RAF Kinloss-based MR2 in Afghanistan in September should not be pre-judged.
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