Comments on: Auxiliary Power Units and You! http://www.aviationchatter.com/2009/07/auxiliary-power-units-and-you/ Exercise Your License to Learn Wed, 08 Feb 2012 19:35:41 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Thinh Bui http://www.aviationchatter.com/2009/07/auxiliary-power-units-and-you/comment-page-1/#comment-7539 Thinh Bui Fri, 21 Oct 2011 19:01:00 +0000 http://www.aviationchatter.com/?p=1265#comment-7539 The CRJ900 APU mount on the tail so it gives clearance and reduce cabin noise. You'll need to turn on bleed air switch in the center of overhead panel to run air conditioning. The CRJ900 APU mount on the tail so it gives clearance and reduce cabin noise. You’ll need to turn on bleed air switch in the center of overhead panel to run air conditioning.

]]> By: Patrick Flannigan http://www.aviationchatter.com/2009/07/auxiliary-power-units-and-you/comment-page-1/#comment-2079 Patrick Flannigan Sat, 11 Jul 2009 22:33:18 +0000 http://www.aviationchatter.com/?p=1265#comment-2079 Thanks for the added info Jeffrey. You're kidding, the 700 and 900 automatically transfer the bleeds!? I swear those four switchlights are the most confusing buttons on the 200. Thanks for the added info Jeffrey. You’re kidding, the 700 and 900 automatically transfer the bleeds!? I swear those four switchlights are the most confusing buttons on the 200.

]]> By: Jeffrey Synk http://www.aviationchatter.com/2009/07/auxiliary-power-units-and-you/comment-page-1/#comment-2078 Jeffrey Synk Sat, 11 Jul 2009 11:42:15 +0000 http://www.aviationchatter.com/?p=1265#comment-2078 Nice article Patrick. Here is little more info on the APU for the CRJ: 1. Its Primary purpose is electrical and its secondary purpose is air conditioning, though if it's hot out you would think that its primary purpose in air conditioning. 2. During approaches, when there is icing, you have to start and use the CRJ200's APU since the engines are not strong enough to both provide thrust and bleed air for anti-ice and de-icing purposes. 3. In the CRJ200, the crew has to transfer the bleeds from the engine to the APU. The CRJ700 and CRJ900 does it automatically 4. The overall operating characteristics of the APU on the CRJ700 and CRJ900 are far superior to the APU on the CRJ200. Thanks for the post! Regards, Jeffrey Synk Nice article Patrick.

Here is little more info on the APU for the CRJ:

1. Its Primary purpose is electrical and its secondary purpose is air conditioning, though if it’s hot out you would think that its primary purpose in air conditioning.

2. During approaches, when there is icing, you have to start and use the CRJ200′s APU since the engines are not strong enough to both provide thrust and bleed air for anti-ice and de-icing purposes.

3. In the CRJ200, the crew has to transfer the bleeds from the engine to the APU. The CRJ700 and CRJ900 does it automatically

4. The overall operating characteristics of the APU on the CRJ700 and CRJ900 are far superior to the APU on the CRJ200.

Thanks for the post!

Regards,

Jeffrey Synk

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