September 15, 201312 yr Commercial Member Hi, I have two issues with takeoff. First, I'm unable to activate N1 mode for takeoff thrust. For some reason, during the takeoff roll, LNAV/VNAV disarm, and can not be re-engaged until after takeoff. I suspect the two are related somehow? Before takeoff I have [bLANK][TOGA][TOGA] [LNAV][VNAV] but during takeoff I get: [bLANK][TOGA][TOGA] What am I missing? I also have a key bound via the FMC to TOGA, so not sure what I'm doing wrong here. :huh: Best regards, Robin.
September 15, 201312 yr I'm not sure about VNAV, but I do remember reading something that LNAV won't activate if your departure (runway) heading is not aligned with or on an intercept course with the first leg of your route. Maybe try adding a PBD 3 or 4nm along the departure heading as your first waypoint? Something to try anyway...
September 15, 201312 yr If you press toga more than once it will disarm lnav and vnav and they will only be available again above 400ft. As for not getting the auto throttle to spool up make sure they are both armed, advance thrust levers to around 55% N1 and let them stabilize before pushing either toga button (or the click spot) ONCE and they should advance. René Pedersen
September 15, 201312 yr Author Commercial Member Hmm maybe they are not spooled enough... Thanks! Best regards, Robin.
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