Questions regarding the default 737

Mr_Smith · January 28, 2023 at 12:46 PM

Hi there,

I did a flight with the 737 yesterday and some questions came up.
So I wanted to open a thread for these and maybe more to come:

The device marked in the picture below seems to be used in order to figure out V2.
The ZFW, which is set there by default, does not seem to match with the ZFW of the FMC though:
87080/2.2 = 39.581. Am I miscalculating?
Would it not be better to have this device show weights in KGS?
Does someone know the minimum flaps speeds for this 737?
The FMC calculates a T/D. However there is no page in the FMC revealing the DIST to the T/D, is there?
How do you figure out Vref for landing? I just used the table next to the device I mentioned,
but these speeds seem to be meant for a heavier configuration...

Greetings!

Jet-Pack (IPACS) · January 28, 2023 at 2:18 PM Official Post

Some of the numbers seem to be incorrectly entered by default, I'll change them.

The actual mass of the aircraft without fuel is 39200 kg or about 86420 lbs and the gross mass is 46000kg, with 6800kgs fuel on board.

With an empty mass of about 31950 kg the passenger mass the remaining payload is 7250 kg, 47 passengers and 3250 kg cargo.

The mechanical calculator shows the value in a wrong unit, it should multiply by 2.2 but it currently divides the value by it.

With the ZFW entered into the mechanical calculator you can enter your desired landing flap setting with the knob in the lower right and the needle will point at the Vref for landing. For now a Vref of 135 is a good value for Flap 40. It should actually be lower than that but we'll address this issue once we implement a proper way to set the fuel and payload in a menu in Aerofly, some time in the future.

Mr_Smith · January 28, 2023 at 6:00 PM

Thank you Jan for giving these information and for considering the small fix for the default weights.

Mr_Smith · January 28, 2023 at 6:40 PM

Hey Jet-Pack (IPACS) Jan,

during my second test/practice flight inside the default 737 I just noticed an issue which seems strange to me:

I had increased the DH to 500 and pressed the little red button, which says "puch to set".

Then, during final approach the new DH got announced correctly. However, as I descended down to 200 ft AGL

the old (default) DH got announced as well. So basically two DHs got announced.

Jet-Pack (IPACS) · January 28, 2023 at 7:15 PM Official Post

Probably one from the pilot radar altimeter and another from the copilot radar altimeter. Did you set both sides?

Mr_Smith · January 28, 2023 at 7:22 PM

Quote from Jet-Pack (IPACS)

Did you set both sides?

No, I didn't! That's must be the explanation. I wasn't even aware, that the DH works separately.

Mr_Smith · January 29, 2023 at 9:43 PM

If I may ask another question:

What does "ESAD" stand for in the FMC?

It shows the same value as "DIST".

Jet-Pack (IPACS) · January 29, 2023 at 11:09 PM Official Post

Estimated air distance I think.

*Edit: Equivalent still air distance

Mr_Smith · January 29, 2023 at 11:46 PM

Ah, ok, thanks. Is the 737 the first Boeing from Aerofly? Like all others have a Boeing FMC. Or has the 737-500 this kind of FMC?

It gives a lot of information while leaving out the basic ones like V-Speeds or the DIST to T/D.

Overloaded · January 30, 2023 at 4:14 AM

It is the EQUIVALENT STILL AIR DISTANCE. The FMC calculates the distance to be flown through the air taking into account the predicted or derived wind speeds and directions. With a strong headwind the ESAD will be significantly longer than the distance over the ground.

Don’t expect all of the functions to be working at this stage of the Aerofly FMC’s development.

Jet-Pack (IPACS) · January 30, 2023 at 7:51 AM Official Post

Quote from Overloaded

It is the EQUIVALENT STILL AIR DISTANCE.

Yes, that's the one.

Mr_Smith · January 30, 2023 at 12:09 PM

Ok, thanks for your detailed info!