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737 OPT/MAX FL

 
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efpg0708



Joined: 21 Jan 2015
Posts: 118

PostPosted: Sun Feb 12, 2017 6:53 pm    Post subject: 737 OPT/MAX FL Reply with quote

Hi guys

Really enjoying V1.70, however there is one small thing that's been happening to me ... The OPT/MAX FL indicated on the FMC CRZ page is to low. I'm never able to fly above FL370, very rarely above FL360. For instance, took off from EHAM today with a TOW of 69.600 kgs and the FMC gave me FL343 as optimal FL, which is to low for the 738. A few weeks back did a 6.5 hour flight and couldn't fly above FL290 after takeoff.

Did you guys also noticed that ? Mark/Steve, is there any update planned to correct that ?

Thanks

Eduardo
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Marco Eckl 777



Joined: 11 Dec 2015
Posts: 124
Location: Belp | LSZB

PostPosted: Mon Feb 13, 2017 1:31 am    Post subject: Reply with quote

Hi Eduardo,

depending on the length of your flight and weight of your AC (Dont know the MTOW for the 738 by hard) you should do a step climb for sure.

In the performance manual for the 738 there should be a altitude table mentioning the max and opt alts for the certain weights.

In my case in the T7 when taking off with 320t i will SC from lets say 290 -> 310 -> 330 and so on. But the first level is always quite low.

Try to get hold of a FPPM and check the values.
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efpg0708



Joined: 21 Jan 2015
Posts: 118

PostPosted: Mon Feb 13, 2017 8:44 am    Post subject: Reply with quote

Marco Eckl 777 wrote:
Hi Eduardo,

depending on the length of your flight and weight of your AC (Dont know the MTOW for the 738 by hard) you should do a step climb for sure.

In the performance manual for the 738 there should be a altitude table mentioning the max and opt alts for the certain weights.

In my case in the T7 when taking off with 320t i will SC from lets say 290 -> 310 -> 330 and so on. But the first level is always quite low.

Try to get hold of a FPPM and check the values.


Hi Marco thanks for your answer

I'm basing my info on GOL and COPA's 737-800 (not the SFP), and data from flightradar 24. The step climbs do happen, however the initial altitudes are low for the 738 !
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MarkHastings



Joined: 18 Jan 2006
Posts: 666
Location: UK

PostPosted: Mon Feb 13, 2017 2:02 pm    Post subject: Reply with quote

Max Take Off weights vary a lot depending on the exact aircraft spec.
Standard -800 or High Gross Weight versions can vary from ~70.7KG upto ~79.2KG

Here is an exert from the FCOM :


So at ~70.0KGs FL345 would be optimum, and FL373 would be Max.

Here are the MTOW's for the -800 and -900
For the -800, taking off at 69.6KG is near Max TOW.


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efpg0708



Joined: 21 Jan 2015
Posts: 118

PostPosted: Mon Feb 13, 2017 10:18 pm    Post subject: Reply with quote

Thanks for the answer Mark.

Under very specific conditions the MTOW for the -800 will be as low as ~70.0 kgs. For the majority of operations it a lot closer to ~79.0 Kgs.
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