my turn to call b-ll****
Not so fast, piggy. You are making the dangerous assumption that sir.pratt is pilot... as opposed to, say, a ginger beer...
BTW he is right about the sometimes simplistic nature of pilot training notes. You can only understand how a system really works if you examine the maintenance manual system diagrams...
I always used to borrow a copy of the parts manual if I really wanted some in-depth info. Engineers are always throwing them away as updates arrive (usually on CD these days). you just need a copy of the reading software (such as Sapphire). Can be quite enlightening.