Reduced Mobility; it is actually in IATA's guidelines to restrict the number of WHRC cases to the number of pairs of level emergency exits (i.e. not including overwing exits). On 737/A320 that means 2 WHRC cases!
EASA has just released NPA2014-01 which touches on this issue, however from what I have seen it is rather beating around the bush, stating that a limit is logical, however without any proper guidance, whilst inviting opinions.
Last edited by Jetset320; 8th Jan 2014 at 21:32.