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Originally Posted by CalgaryLankan
What is MEL relief?
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MEL stands for Minimum Equipment List. Every commercial aircraft has a MEL that lists what is allowed to be broken onboard the aircraft and still allow it to operate. Many times there are conditions attached to the MEL that require specific maintenance actions to be performed or certain operational procedures to be followed. In every case, there is a specific time period attached to the item that states just how long the aircraft may operate before the item is required to be fixed.
In the case of the AC 767, it appears that there was an issue with the LH pack that required them to turn back to Calgary. It seems that they weren't able to fix the problem so they turned to the MEL which (I presume) stated that either the LH or RH pack maybe be inoperative for xxx number of days provided that a certain maintenance action was performed (in this case it sounds like it had to do with the high pressure shut-off valve) and certain operational procedures were followed (although not familiar with the 767 specifically, generally if one pack is MEL'd there is a reduced maximum altitude permitted for flight associated with it).