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Cabin Pressure On Taxi  
User currently offlinectempleton3 From United States of America, joined Mar 2008, 17 posts, RR: 0
Posted (3 years 4 months 4 days 2 hours ago) and read 4959 times:

I my last flight I noticed that my ear's start to pop on taxi before takeoff. What would cause this? Is the pressure in the cabin decressed or increased before takeoff in any way?

Thanks,
Charles

8 replies: All unread, jump to last
 
User currently offlineFly2HMO From , joined Dec 1969, posts, RR:
Reply 1, posted (3 years 4 months 4 days 1 hour ago) and read 4954 times:

Quoting ctempleton3 (Thread starter):
What would cause this? Is the pressure in the cabin decressed or increased before takeoff in any way?

On some planes the cabin is pressurized slightly to put some pressure against door seals. Also if the pilot is moving the throttles briskly often the cabin outflow valves may take a bit to adjust or "catch up" to the changes in bleed air being fed into the cabin.


User currently offlinewncrew From United States of America, joined Jun 2006, 1435 posts, RR: 10
Reply 2, posted (3 years 4 months 4 days ago) and read 4900 times:

As a side-note when working AFT Cabin, I can tell when the FWD door has been closed because I can feel the slight pressure change in my ears. I too notice this on taxi-out occasionally.


ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
User currently offline113312 From United States of America, joined Apr 2005, 569 posts, RR: 1
Reply 3, posted (3 years 4 months 3 days 17 hours ago) and read 4783 times:

Most Boeing aircraft are designed to have about .125 psid prior to takeoff and landing to minimize pressure bump. However, any more differential than that would make it nearly impossible to open emergency exits and that is why such a small amount of pressurization is permitted on the ground.

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 4, posted (3 years 4 months 3 days 8 hours ago) and read 4666 times:

On Ground Pre pressurization to adjust the TO pressure bump.
Normally by a toggle switch on the B737/757.
regds
MEL.



Think of the brighter side!
User currently offlineKingairTA From United States of America, joined Feb 2009, 458 posts, RR: 0
Reply 5, posted (3 years 4 months 3 days 6 hours ago) and read 4645 times:

Could also be a test of the pressurization system prior to take off. Prior to every flight we test the system to ensure the cabin will pressurize. Each bleed air source is tested. This could also be the pressure you feel.

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 6, posted (3 years 4 months 3 days 3 hours ago) and read 4584 times:

Quoting KingairTA (Reply 5):

Could also be a test of the pressurization system prior to take off. Prior to every flight we test the system to ensure the cabin will pressurize. Each bleed air source is tested. This could also be the pressure you feel.

What type are you referring to......On most larger commercial Aircraft the tests are carried out automatically with power up & vide Air Ground sense or vide the CPCs.
regds
MEL.



Think of the brighter side!
User currently offlineKingairTA From United States of America, joined Feb 2009, 458 posts, RR: 0
Reply 7, posted (3 years 4 months 3 days 3 hours ago) and read 4581 times:

We do it on the Kingair and the C-130.

Just throwing that out as a possibility is all.


User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4190 posts, RR: 37
Reply 8, posted (3 years 4 months 1 day 16 hours ago) and read 4280 times:

While that is a procedure on the king air, it is not a procedure on any boeing, airbus, or douglas plane (or the canadair regional jet). Pressurization is fully automatic, and the cabin is slightly pressurized on takeoff partly for door seals, party for the pressure bump, and also the structural integrity of the plane in the event of an excursion.


Chicks dig winglets.
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