looking for a 37 driver to answer this question???

[Highflyinpilot]

Just wondering what the duct pressure indicator on the pneaumatics panel should be reading for normal flight?


Thnaks

[bombardierfixer]

Depends. On apu it should be around 18psi, with engines running it should be around 30-40 psi. Unless you are getting a duct split.
This is where pilots can really help maintenance...Monitor your duct pressures through all phases of flight. The pneumatics can have two issues and there is no way to easily trouble shoot it. If its a constant split you have a pressure problem (PRSOV or the sense lines possibly the BAR) if its transient or changes its a cooling air issue(temp sensors or precooler valve). If we get "duct spilt" it takes about twice as long to figure out.

[Herc_Driver]

Just wondering what the duct pressure indicator on the pneaumatics panel should be reading for normal flight?


Thnaks

With climb power set - about 40-45 PSI.
At cruise - about 35-40 PSI.

Rough WAGS .... depends on the aircraft ...

[Highflyinpilot]

Thanks for the responses, Much appreciated.

[kenuck]

Attached file is from the maintenance manual and might help

Cheers

duct pressure.jpg (204.81 KiB) Viewed 1445 times