B737-800
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Confusion; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Aircraft; Procedure; MEL; Human Factors
I pulled up the flight documents for Aircraft X:-  Aircraft was on MEL XX-XX Left Pack Inoperative-  The First Officer and I reviewed the MEL for Left Pack Inoperative and concluded that all applicable items were complied with. -  We reviewed and discussed the [appropriate procedures] -  We then reviewed the procedure under 'Left Pack Inoperative' and how we would prepare the aircraft prior to takeoff.-  When cleared for takeoff we repositioned the switches as described in [the aforementioned procedure]-  After selecting TOGA for Takeoff I noticed that the N1 number was higher than I thought it was on the [Performance Data Sheet] paperwork; however; it did match the numbers that were in the FMC. -  After Takeoff we continued with the procedure-  At cruise we discussed the situation and realized this was more than just a Left Pack Inoperative and was actually a 'Bleeds Off' Takeoff and we should have had a [Performance Data Sheet] reflecting that condition. -  When we arrived [at our destination]; I discussed the situation with the 'Outbound Crew' and mentioned to them that I thought this situation should have a Bleeds Off Takeoff [Performance Data Sheet]. He looked at his paperwork and noticed it did not show Bleeds Off but instead was identical to my [Performance Data Sheet]; a normal Bleeds On [Performance Data Sheet].Dispatch failed to realize that the MEL would result in a Bleeds Off Take-Off thus requiring a different/adjusted [Performance Data Sheet]There is no mention in the in the MEL that the Operator should request a Bleeds Off Takeoff [Performance Data Sheet]Lessons Learned:- There is no reference in the MEL that the procedures outlined in XX-XX Left Pack Inoperative will result in a Bleeds Off Takeoff and to ensure you have a [Performance Data Sheet] reflecting that condition.-  In my discussions with Dispatch; it appears there is no indication to them that this procedure will result in a Bleeds Off Takeoff and to supply a [Performance Data Sheet] reflecting that condition.- There needs to be a bullet point in the MEL XX-XX procedure under Left Pack Inoperative that reminds the crew they need a Bleeds Off [Performance Data Sheet]
B737 Captain reported confusing MEL information related to takeoff procedure with one air conditioning pack inop.