When landing with NAV1 set to the ILS runway heading, the TBM 930 tracks straight down the center line of the runway, exactly like APPR would if it had APPR. I haven’t found any other IF plane landing without APPR that performs as perfectly as this. They all drift off the center line when approaching the runway. Why does the TBM 930 work so well and the others don’t?
I noticed this, good question!
This is just an assumption but the TBM is a relatively new aircraft and also has very accurate physics from what I’ve heard. So maybe that’s why it performs better than other planes but I could be wrong 🤷🏼♂️
Maybe this could be due to the size and physics on the TBM, the TBM is much smaller and more mobile then a 737 and so also at slower speeds has a better turning circle then other aircraft.
The TBM is a also a very smooth plane to fly and the Auto pilot I’ve found is very sensitive to inputs.
Ive gotten alot of planes to do the tbm does it better because the ILS is based on radar and your plane has to be inside that beam the smaller planes have more room than say a 777 in the same beam of radar
No, the size of the plane doesn’t seem to matter. Whether it’s a Cessna 208 or an Airbus, if you are making a non-APPR landing with NAV1 set to your ILS runway, all IF planes I have tested, except the TBM 930, will drift off the center line when landing. Only the TBM 930 will hold the center line for a perfectly straight-in landing.
True, I wish the devs would give us.some light as to how the NAV functions differently for the tbm.
I don’t think so, ILS systems use radio tranmission technology and frequency differences (modulation) to indicate the flight path (I believe)
Nope. ILS is based on measuring the difference between the two “lobes” of frequencies (90 Hz and 150 Hz) generated by the localiser and correspondingly creating an indication of “too far left” or “too far right” on the localiser. Same for glideslope, it’s like a localiser turned on its side.
Radar works on the principle of reflection of radio waves. Not the same thing at all.
Also, if you’re choosing NAV1 as your reference for autopilot to follow, you’re essentially flying a LOC (localiser-only) approach, which is a non-precision approach. It means that the autopilot will try to hold the localiser needle centred all the way down. Following the glideslope is up to you. This kind of approach is non-precision, and I believe (could be totally wrong here though), that below minimums, some amount of drift is to be expected in the sim. Perhaps the TBM just does it better because of improved physics and a slower approach speed than other aircraft (you mentioned the 208, which has a similar approach speed but outdated physics, and the 757 or Airbus, which has good physics but quicker approach speed). Flying a non-precision approach will not, and should not be expected to take you all the way down to the threshold of the runway.
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