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B738 Lnav Arm For G/a

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B738 Lnav Arm For G/a

Old 11th Aug 2010, 06:24
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B738 Lnav Arm For G/a

Anyone know at what stage does LNAV arm for Go around during the approach?
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Old 11th Aug 2010, 07:20
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It doesn't arm itself. You have to do it - we do it above 400' AGL.
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Old 11th Aug 2010, 09:15
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hmmm arms itself on ours during the approach. just never quite got when (or logic) it happens
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Old 11th Aug 2010, 09:21
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Well even before LOC intercept ours display both VOR/LOC and LNAV in white below the active mode (which can also be LNAV!), its quite a mess - I'll pay attention to it next time to figure out when that happens...
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Old 11th Aug 2010, 11:11
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all i could find

When a missed approach exists in the flight plan and the FCCs are capable of
entering go-around, LNAV arm will be annunciated on the FMA. The roll go-around track hold mode will automatically transition to LNAV during a missed approach.

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still no idea when it comes up. i would guess "on final".
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Old 11th Aug 2010, 11:26
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Thanks....
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