landing gear problems
hello bacern,
may i try to find the answer?
you must somehow find a way to get rid of A hydraulic pressure to be able to extend the landing gear by gravity. but how?
the famous & delicate solenoid to isolate hydraulic EDP n°1, is burned out, meaning as long as engine n°1 is operating you will have hydraulic pressure, regardless of the A hydr. EDP switch position & pushing the gear up(landing gear lever jammed in up position). so, to start with, switch off elec hydraulic A pump, then shut down engine n°1, but that's only half the solution as, because the landing gear lever is in the(jammed) up position, the landing gear tranfer valve opens & hydraulic B pressure now keeps the gear up. so switch off both B hydraulic pumps, but before doing that, it might be a good idea to go to sby rudder to keep the aeroplane straight. so, here you are, in manual reversion, on one engine. seems to me a very tricky & uncomfortable flight situation but at least you can gravity extend the landing gear & please, leave the manual gear access panel open(NG), so the landing gear will not retract when restarting engine n°1 & restoring normal hydraulic power.
thinking about all this & notwithstanding what the MEL says, i would insist the solenoid to be changed before accepting the aeroplane for flight. finally, all above is just a brain exercise & in reality, if it ever happens, careful analysis & use of NNormal checklist usage should be tried first. but the mr. boeing NNormal checklist, although very good, does not consider multiple failures at the same time, which doesn' t mean it can' t happen.
wonder if i got it somewhat right?
regards,
bm