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737ng flight directors

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Old 7th Jan 2018, 11:10
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Question 737ng flight directors

hello everyone

does anyone knows when exactly the flight director will disappears after takeoff with the switches are turned off ?
and where i can find the information ?
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Old 9th Jan 2018, 14:50
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It might be a customer option, but will they show at all if off? If they do show when TOGA is selected then each channel will disappear when a roll or pitch channel is selected that is not TOGA.
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Old 9th Jan 2018, 19:55
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On the 737's I have flown, 200 to 800, if the flight directors have been inadvertently left off before departure then they remain off until selected on.
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Old 10th Jan 2018, 02:11
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Except for a TOGA click or two after lift off.
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Old 10th Jan 2018, 23:10
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Quite right Denti,

Though I never chose the TOGA option and preferred to flick two little switches on instead.

Always a bit of a shock to the 200 hour F/O to be faced with a blank ADI and no guidance. Good inadvertent training - and they all coped with it well.
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Old 1st Feb 2018, 17:27
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with TOGA will gives 15 pitch up ...
my question when the 15 degree pitch up will disappear ?

and many thanks for helping
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Old 2nd Feb 2018, 05:06
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AS has been said, with switches off the FD's will not show until TOGA is pressed twice airborne. When either mode is changed from TOGA that respective FD bar will disappear; same as on GA with switches off.
Changes will be LNAV/HDG SEL & VNAV/LVL CGH/V/S.
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Old 2nd Feb 2018, 20:39
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Don’t forget ALT ACQ RAT 5, that’s where it always gets messy quickly.
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Old 3rd Feb 2018, 08:17
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Indeed: Well spotted. and add to it if A/T is still in THR HLD. That is a double WTF moment as you approach warp factor.............
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