TMS for approach and final approach
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What should the TMS ideally be set to during the above phases? Should it be off, or still in the descent mode?
I keep seeing conflicting recommendations.
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Perfect, thank you. Decent mode until then though, right? To ensure the hydraulics and electrics are sound?
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The purpose of DESC mode on the TMS is to control the minimum engine N2 to ensure that sufficient air is always being supplied to the air conditioning and ice protection systems.
So you would typically use DESC mode during descent to keep the engine N2 above the normal flight idle, and then during the approach the engines will likely be at a higher power setting, so SYNC mode would normally be used.
Further info on the TMS modes can be found on pages 166-170 of the 146 Professional manual: https://downloads.justflight.com/products/JFF003642/146_Professional_MSFS_manual.pdf
Mark - Just Flight
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In service, very, very few pilots used the DSC mode for descent. It is far easier to descend in IAS/Mach with TMS N1 Sync (to achieve the required ROD) and to transit to V/S mode when required, while (of course) observing the minimum N2 limits.
