Aircraft FAQ

I can't arm VNAV for departure!

On the 737 Classic, VNAV is unavailable until 400ft AGL.

Updated Latest published version

On the 737 Classic, VNAV is unavailable until 400ft AGL.

Takeoffs are normally done in TOGA and HDG SEL, with LNAV/VNAV being engaged at 400ft.

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Source: CSS Launcher User Manual, Rev. 5 — December 2025.