If the tank cocks are shut then 50 psi is the instantaneous px in the system and is checked. If you carry our replacement of any component do you carrry out MPxx-xx yes, does this involve this check yes. Is this routinely carried out before AAR sorties, yes. Can this be waived? No. Is this routinely carried out at a certain calendar periodicity? yes. Do Groundcrew pay lip service to this check? No but if you can prove otherwise then I would be surprised and definitely disappointed. Do people lie to BoI my conscience is clear and having a quiz that you don't know the answer to proves you to be a fool and not a knave. Best of luck with Bienvinida Sir Pete.
Oh yes the equipment is available at isk and any responsible sooty would have the kit available at a detached location chin chin old boy.