Pressurization Stumper

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Pressurization Stumper

Postby DSengine » 14 Apr 2016, 21:13

During flight (cruise) for system check with the left pack selected to HIGH the cabin pressure rate increases vice decreases. They also stated the systems check good on deck and there are no failures called out. All our ground checks passed with no indications of flow issues all air conditioning checks were performed with no duplication of discrepancy stated.
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Re: Pressurization Stumper

Postby engineer » 14 Apr 2016, 23:15

Hello DSengine! If I understood correctly during the test pressure rate increases instead of decreasing.1st question is it NG? If,yes-Did they test the smoke removal mode?

For operating pack in the smoke removal mode:

Left or right pack switch - HIGH
R RECIRC FAN switch - OFF
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Re: Pressurization Stumper

Postby DSengine » 15 Apr 2016, 01:20

Thanks engineer, sorry about that, NG and I do not think the smoke removal. I'll follow up in the morning.
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Re: Pressurization Stumper

Postby DSengine » 19 Apr 2016, 18:05

UPDATE:

No troubleshooting done on the smoke removal mode. Only maintenance done was on the heat exchanger. The follow on checks were all good.
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Re: Pressurization Stumper

Postby ALFRED » 21 Apr 2016, 23:18

smoke removal mode can cause cabin pressure decrease and increase if you dont put recirculation fan to off.check again when it is off
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Re: Pressurization Stumper

Postby DSengine » 13 Jun 2016, 16:50

The troubleshooting continues, with updated flight information; it is only with the RIGHT Pack selected to HIGH FLOW mode. The other pack operates as required during the flight check.
All ground checks pass.
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