xjt4me

I remember doing an IAH-ABQ turn last summer. I had never gone to ABQ before. I asked the captain if we needed to factor in the effects of density alt during our T/O and climb-out and the CA told me that we didn't need to worry about the effects of density alt on our airplane. However, the CA didn't elaborate. I would think density alt still effects the length of T/O roll, climbout and missed approach performance...right? Can someone please elobarte whether density alt effects our plane, etc. Thx.

RBower

It is taken into account with the ATOGS. The numbers are custom derived for that airport. And that is why you have to pick a temperature, notice how the numbers get smaller as it gets warmer?

As far as missed approach, that would be covered by our specials if we needed it.

Climb out...yea it suffers you just climb slower, big deal.

juice

sure density altitude makes a difference, ever been to MEX, COS just to name a few, besides ABQ that you mentioned?

as RBower said, look at the performance manual for those airports.... the climb limit specifically... it drops, and drops FAST as the temp goes up. that is why on a lot of warm days in those airports you need E-TO. and if you have an LR in MTJ, GDL, BJX etc, you might not be able to get 50 people on cause of these limits...

also, you'll notice it takes a lot longer to get to V1 as well.

or, on a hot day in LEX, CRW with fairly short runways, you'll probably need flaps 18 if you are full/pretty full.

sspears737

Are you a line pilot...and seriously asking this question?

xjt4me

Sspears, yes, I'm a line pilot. This was a concern for me but NOT a concern for the CA I was flying with. That's why I asked the question. Why would you care that I asked my original question in the first place?

Smoe

Your CA is an idiot and had no business being in the front end of an airplane...

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pscraig

Why does it matter? The numbers in the runway analysis charts take all of that into account-if the numbers say we can go, we go. It's very clear and unambiguous.

rjacobs

The performance charts account for temp, but not for non-standard altimeter settings. They are based on standard altimeter settings. There is a page in the Vol 1, 5-XXX(cant remember the exact page, its in the performance section, used to be in the QRH, and I guess it also used to be on the back of the W&B sheets) that lets you account for non-standard settings. Lower settings allow you to take a different temp than higher settings. It could be substantial enough to cause a bump of pax/cargo or it could allow you to take another pax or some extra cargo. Its another one of those pages thats nice to know. Just like the temporary runway length reduction pages.

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UFOGUY

Sure Density Altitude plays a factor on our aircraft performance. You know that! If you dont know that DA plays a factor on our aircraft, then I dont know what to say. It affects us no matter how big or small, heavy or light an aircraft you are flying. What does it mean to you? Know how it affects you (just like it always has), and know what you can do about it in 5 easy steps.

Step 1: Get the ATIS

Step 2: Pull out your performance manual.

Step 3: Find the reduction or addition in tempeture you need due to effects of atmospheric pressure and then modify your ATIS temp.

Step 4: Locate that temp on your runway chart, find the corresponding maximum takeoff weight and limiting factor.

Step 5: Can you go at that weight? Yes, sweet. No, okay new chart or more takeoff power.

ramira18

wowowow step 3 there! I didnt think ya had to do that, you just use what atis throws at ya?

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