Okay, I'm confused (no surprise there, right). Was the original question about in universe lance staffing or about the rules for staffing a lance for a campaign or fiction? Also, from what I've been reading here it looks like my Compendium with an inch of dust on it is out of date. Bummer.
Not sure? Both?
According to the latest set of rule, a ‘Mech Transport Bay (not to be confused with other means of transporting a ‘Mech) has enough equipment included in the tonnage (150 tons per) to provide the gantries/harness, etc. that a ‘Mech needs, plus accommodations for a MechWarrior and a single Technical Support Person.
For campaign purposes you can decide/pay for what type of tech support the included individual is: an AsTech, Senior Tech, etc. You can also add additional bay personnel or passengers to a vessel by subtracting from the generic cargo tonnage available.
Interestingly, some transport bays have an additional tech support individual included in the bay's total weight.
That said, given the 1+6 Tech Support Team setup I would think that units operating in the field would add additional Infantry Bay-type quarters for the extra Techs (if they can afford them). So if the single Tech assigned to the ‘Mech Bay is a senior technician, then each ‘Mech would only require six extra AsTechs. Rounding out - a
Union class DropShip's 12 ‘Mech Company would require three 5 ton Infantry Bay-accommodations to supply the ‘Mech company with full tech support. 15 tons, plus food and water from the available cargo tonnage, and the ‘Mech Company is ready to rock n' roll.