Hello Navigraph/Simbrief team,
First of all, I would like to wish you happy holidays. This is Ricardo from Brazil.
I have a question regarding Santos Dumont Airport (SBRJ) in Simbrief that I can’t quite understand.
I enjoy using Simbrief and the runway analysis to fill in the V1, VR, and V2 data, as well as Derated and temperature selection for my PMDG 737. Even though it already has the UFT (Tablet), I like using Simbrief for these details to enhance immersion and for the ease of manually entering the data into the FMC. However, there’s an issue with one particular airport, SBRJ (Santos Dumont Airport), where I encounter calculation problems.
On the air bridge (SBRJ - SBSP), Gol Linhas Aéreas, in real life, uses both the 737-800 equipped with the Short Field Package and the 737-700. In my flights, I am using the 737-700. As we know, Santos Dumont is an airport with a short runway that receives these aircraft daily.
My question is, what criteria, besides pressure, temperature, and wind, are being used to calculate the maximum takeoff weight for certain airports like SBRJ with specific aircraft?
Doing the same in the takeoff calculation menu in Simbrief returns a high limitation on the takeoff weight. The difference is more than 4000kg when calculated on the tablet itself. What could be causing the Simbrief calculator to waste so much weight? Is there any criterion even greater than the tablet?
When trying to calculate using the PMDG Tablet, with the takeoff weight imported from Simbrief, it works normally. Even if I simulate a higher weight, it warns that the weight is limited to a value much higher than what is calculated by Simbrief, considering pressure, temperature, wind, etc.
I understand that Simbrief uses different performance calculation methods, but does it take into account special airports like SBRJ, where there is a short runway but served by aircraft like the 737-800 and 700?
I will attach the following screenshots in the following order:
- Screenshot of the Simbrief takeoff calculator for the PMDG 737 with the maximum takeoff weight limit warning.
- Screenshot of the 737 tablet screen calculating the takeoff and providing V1, V2, V2, and flaps values, with the weight brought from Simbrief.
- Screenshot simulating a higher weight and indicating a takeoff weight higher than predicted by Simbrief.
Finally, and not least importantly, how do I change the pressure unit from In.Hg to HPA in both the “LIDO” Briefing and the takeoff analysis? As shown in the screenshot below, the atmospheric pressure return in the calculation is in In.Hg. I tried looking for something in my settings but couldn’t find it.
Thank you for the response.
Ricardo.