Apu inop
09-15-2021, 01:43 PM
#12
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Joined APC: Oct 2019
Posts: 186
Originally Posted by dremaldent
Take about 500 lbs extra fuel and then increase thrust on the right engine. It only takes about 70% N2 to deliver the maximum PSI to the PACK. The only downside is that you can't do this while you're moving. I've successfully cooled the cabin to 24 degrees using this technique. Not the most comfortable but at least a safe temperature, and better than canceling the flight by a long shot.
No APU really isn't that big of a deal. Obviously a little more work, but it is still possible to run flights safely unless the temperature outside is over 100 F.
No APU really isn't that big of a deal. Obviously a little more work, but it is still possible to run flights safely unless the temperature outside is over 100 F.
09-15-2021, 05:57 PM
#13
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Joined APC: Feb 2015
Posts: 591
Originally Posted by dremaldent
I'm an idiot. Don't do this. Combination of misremembering things and being very tired. Sorry y'all
09-15-2021, 06:18 PM
#14
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Joined APC: May 2016
Posts: 1,609
So I’m assuming you are talking about the 145. No APU is kinda an iffy one. It only really sucks on the taxi out and does fine once you are in the air. The thing is you have to have a good PCA to cool it down and leave it on as long as possible. If no PCA then I’m not taking it.
It’s the pack1 inop that is an absolute no go item when it’s hot and sunny out there. The flight deck gets north of 45 at times. I have taken them without a pack1 when it wasn’t too hot but sunny. Big mistake. The avionics heats up the flight deck pretty good too.
It’s the pack1 inop that is an absolute no go item when it’s hot and sunny out there. The flight deck gets north of 45 at times. I have taken them without a pack1 when it wasn’t too hot but sunny. Big mistake. The avionics heats up the flight deck pretty good too.
09-15-2021, 06:45 PM
#15
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Joined APC: Jun 2017
Posts: 80
Originally Posted by Pedro4President
So I’m assuming you are talking about the 145. No APU is kinda an iffy one. It only really sucks on the taxi out and does fine once you are in the air. The thing is you have to have a good PCA to cool it down and leave it on as long as possible. If no PCA then I’m not taking it.
It’s the pack1 inop that is an absolute no go item when it’s hot and sunny out there. The flight deck gets north of 45 at times. I have taken them without a pack1 when it wasn’t too hot but sunny. Big mistake. The avionics heats up the flight deck pretty good too.
It’s the pack1 inop that is an absolute no go item when it’s hot and sunny out there. The flight deck gets north of 45 at times. I have taken them without a pack1 when it wasn’t too hot but sunny. Big mistake. The avionics heats up the flight deck pretty good too.
09-18-2021, 01:29 PM
#18
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Joined APC: Aug 2013
Posts: 164
Originally Posted by dremaldent
Take about 500 lbs extra fuel and then increase thrust on the right engine. It only takes about 70% N2 to deliver the maximum PSI to the PACK. The only downside is that you can't do this while you're moving. I've successfully cooled the cabin to 24 degrees using this technique. Not the most comfortable but at least a safe temperature, and better than canceling the flight by a long shot.
No APU really isn't that big of a deal. Obviously a little more work, but it is still possible to run flights safely unless the temperature outside is over 100 F.
No APU really isn't that big of a deal. Obviously a little more work, but it is still possible to run flights safely unless the temperature outside is over 100 F.
09-18-2021, 01:34 PM
#19
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Joined APC: Jul 2014
Position: B747 FO
Posts: 610
Originally Posted by RJ4LIFE
You took a lot of flak for this being unsafe but I'd contend that it can be done perfectly safely once you're away from the ramp, especially at outstations where there's usually nobody taxiing directly behind you. The problem is that as the cabin cools down, your brakes will quickly heat up and you might even end up having to delay your takeoff to let them cool, which defeats the whole purpose. Ask me how I know
I made the mistake to take a 200 in ORD early in the morning, first flight of the day to MKE and back. BIG mistake, and swore never to do that again. The problem is not the flight time, its the taxi time, you cant or shouldn't taxi with enough power to cool the cabin without the APU.
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