b737ng tec questions
hello cap loko,
interesting questions indeed.
i have no clue if my answers are correct, but here some reflections about the matter:
1) hydraulics. boeing did away with standpipes in sys.B, b737ng, because, from past experience, maybe they think it is not necessary any more. with massive sys.B leak you will still have enough fluid for ptu operation. in general, if something is deemed not necessary & or not required, boeing & any other aircraft manufacturer as a matter of fact, will not install it on cost/certification basis alone.
2) mach trim. computer calculations & flighttesting probably demonstrated that flying with mach trim inop was safe till 280kts/M.82. that the system moves the elevator & not the stab trim is maybe just the reason as to prevent a stab trim runaway.
3) flying at maneuverspeed is according to boeing, safe with adequate margins above stickshaker even with 25°bank + 15° overshoot.
i recommend reading boeing training manual, chapter general info,"flap usage"