Engine split duct pressure L=80 PSI R=40psi

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Engine split duct pressure L=80 PSI R=40psi

Postby ALFRED » 12 Oct 2020, 12:23

-During engines start:
ENG#1(L) ENG#2(R)
N1 50%: 30 N1 50%: 30
60%: 30 60%:28
80%: 20 80%:25
-during climb:
Up to 25 000ft
L: *80* R: *40*
- during cruise:
L: 20 R: 25
- during descend:
L: 20 R:15
Left is high .
Replaced PRSOV,BAR no change
Who is experienced with this
ALFRED
 
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Re: Engine split duct pressure L=80 PSI R=40psi

Postby BoeingMn » 12 Oct 2020, 13:02

According to the FCOM volume 2 page 2.20.2 it says

“Differences between L and R duct pressure on the bleed air duct pressure indicator are considered normal as long as there is sufficient air for cabin pressurisation.”
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Re: Engine split duct pressure L=80 PSI R=40psi

Postby Dunny » 23 Oct 2020, 05:33

been seeing this a lot with stored airplanes coming back into service

we've been replacing the preecooler control valve sensor and the 450f thermostat. They are up in the pylon together, so it makes sense to replace them both whilst you are there.
Dunny
 
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Re: Engine split duct pressure L=80 PSI R=40psi

Postby flyday » 24 Oct 2020, 15:46

BoeingMn wrote:According to the FCOM volume 2 page 2.20.2 it says

“Differences between L and R duct pressure on the bleed air duct pressure indicator are considered normal as long as there is sufficient air for cabin pressurisation.”


ONLY IF duct pressure is below 50PSI ? ? ?
flyday
 
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