May 20, 20188 yr Hi, On most LIDO charts, there tends to be a runway threshold, or TDZ, elevation shown. For example, in EGLL, runway 09R it says: 79 / 3hPa (assumingly indicating runway threshold height) So my question is, what does the Pressure after the elevation mean? Does this mean it Changes with 3ft every hPa change? So, let's say if you're entering the TDZ elevation in to your Head-up System, should you enter an elevation of 79ft Always, or correct it based on the Pressure difference? Thanks. Marcus Haraldsson
May 20, 20188 yr https://www.scribd.com/doc/110905773/Lido-Legends-and-Tables-PDF for now, cheers john martin
May 20, 20188 yr It's an info on how to convert between QFE and QNH. QNH = QFE + differential ( 3 hPa in your example ) Learning to fly gliders since 1980AMD Ryzen 5600x, 32GB DDR4, RTX 3060Ti (8GB), GIGABYTE B550 AORUS Elite AX V2 mobo, 1TB + 500GB nvme m.2 disks
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