Hi all,
On every single flight I fly, the TLR VREF and the MCDU VLS don't match. It's not an occasional glitch, it happens consistently. I'm attaching two screenshots from one representative flight (EDDF-OERK) that illustrate this clearly, but the same pattern shows up every time.
Screenshot 1 (EFB - Landing Performance page):
LW (T) = 229.0t
Weight Variant set to Standard (not HGW) — this matches the aircraft profile I use in SimBrief, which is also set to Standard
EFB computes VAPP = 147kt
Screenshot 2 (MCDU - PERF APPR page, same moment, same flight):
Landing conf selected: FULL
FMGC VLS = 142kt
The EFB's own math checks out internally: 142 (VLS) + 5 (wind correction) = 147 (VAPP shown). So the EFB is being consistent with itself.
The problem is the TLR. Cross-referencing the TLR's landing distance table (visible in the screenshots) for LDW 2280 (i.e. 228.0t, closest bracket to the 229.0t landing weight used), the VREF listed is 148kt. That's a 6kt gap against the FMGC VLS of 142kt for what should be the same landing configuration and weight.
This isn't a one-off - I've seen the same pattern on every flight I've logged, with the gap ranging roughly 4-8 kt (TLR VREF always higher than FMGC VLS, never the other way round). For comparison, on the Fenix A320 I fly regularly, TLR VREF and FMGC VLS are generally very close (within a knot or so) - nothing like the consistent multi-knot gap I'm seeing on the A346.
What I'm trying to figure out:
I honestly don't know which value is "correct" here, and I don't expect this forum to be able to verify SimBrief's internal TLR calculation. So rather than asking "which one is a bug," I'm curious about the practical side:
For those of you flying the A346 regularly - has anyone else noticed the TLR VREF and FMGC VLS not matching like this?
And if so, which value do you actually trust and use for VAPP?
Screenshots attached for reference. Happy to share more data points from other flights if useful.
Thanks!
By
Ryusuke ·
