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Pressurization Issues/erratic


pgindy
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Hello everyone,

For the past month or two we've been having an ongoing issue with pressurization on our J model.  The problem typically gets recognized when flying at higher altitudes, 19-20k ft, thought recently they've stated they had erratic pressurization at all altitudes.  Initially the problem was erratic pressurization throughout flight, resulting in ears popping and discomfort, when at higher altitudes they received a CAB Alt high advisory because cab alt was indicating above 10k ft.  We change a part, it flys 1-2 times and the problem comes back.  We've changed the outflow vlv, cabin pressure controller, vacuum reg, and servo valve, some things have been changed twice to no avail.  Anyone dealt with something similar/have any potential suggestions?

Thanks!

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First thing would be to make sure it passes a cabin decay check.  Not by a second or two but a good pass.  The ability of the cabin the hold a pressure is important 

Next I would check the Jet Pump and check valve under desk in aft right of cockpit.  Check for cleanliness and corrosion.  Both have been known issues

Check outflow, safety valves.  Make sure the outside static ports on right side of forward fuselage arent clogged or painted over.  Those are the sensing ports for pack and safety valve

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18 hours ago, pgindy said:

Hello everyone,

For the past month or two we've been having an ongoing issue with pressurization on our J model.  The problem typically gets recognized when flying at higher altitudes, 19-20k ft, thought recently they've stated they had erratic pressurization at all altitudes.  Initially the problem was erratic pressurization throughout flight, resulting in ears popping and discomfort, when at higher altitudes they received a CAB Alt high advisory because cab alt was indicating above 10k ft.  We change a part, it flys 1-2 times and the problem comes back.  We've changed the outflow vlv, cabin pressure controller, vacuum reg, and servo valve, some things have been changed twice to no avail.  Anyone dealt with something similar/have any potential suggestions?

Thanks!

Check the system As per Service News

Best Regards

Munir Abbasi

V25N01.pdf

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