2 Sqn's Meteor FR.9 WB124 V safely landed after a mid-air collision with Meteor FR.9 WH542 at Geilenkirchen during a flypast on 15Mar56.   Flight Comment, 2ATAF's Flight Safety magazine reported the incident as follows: " MAJOR WH542 & WB124, 15March CAT. 3 & 2.   These aircraft are taking part in a special squadron formation of twelve which entailed the last four flying in line abreast.   (Web Master: Probably the base-line of a formation forming a Number 2 as is shown in the inset from a later flypast with only three in the base line?)   During a run over the airfield the middle pair of the four in line abreast collided, the wing-tip of one striking the outside of the nacelle of the other.   Both landed safely at base.   COMMENT: It is agreed by all concerned that both these aircraft hit the slipstream of the aircraft ahead at the same time, and in trying to recover control they collided.   For this to happen, either the section leader on whom they were formating was insuffuiciently stepped down, or the two aircraft in question were out of position, or possibly a combination of the two took place.   This has not been resolved.   However the moral is obvious - slipstream can be (and could have been here) an invisible killer, and it is basic airmanship to be wary of its effects." Alan Middleton was on the Squadron at the time and reports: "Here's a photo of a loose formation of Meteor 9's doing a dummy run for a "2" picture before we lost them.   It was decided that we could fit 4 in the line abreast at the bottom and also tighten up the whole formation.   Fortunately for me I was Duty Officer on the 15th when they did just that and found that 4 abreast take more room than 4 in echelon!   Chas Boyer's port wing tip penetrated Tony Winship's starboard engine nacelle and pushed off the HP Cock for him.   Chas knew he was in trouble straight away as his ailerons jammed, but poor old Tony couldn't figure out what was going on for a while as he skidded along on one engine.   All this at 300ft over the Airfield, in close formation, with 3 and 234 Squadrons watching on critically.   Embarrassing.   Meteor FR.9 WB124 V was delivered to 2 Sqn Fri 11Mar55 and declared Cat 4R on Fri 11May56.   (Thanks to Jill Warby. and Alan Middleton.)