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B737 Takeoff with VNAV and LNAV disarmed

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B737 Takeoff with VNAV and LNAV disarmed

Old 11th Sep 2019, 07:06
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B737 Takeoff with VNAV and LNAV disarmed

Hellow everyone, I am currently undergoing B737 and I got question to ask.

Let us say you were instructed to takeoff and fly runway heading soon after departure,
when you hit TOGA, does HDG SEL automatically selected and shows up on FMA or is it after departure ?

James


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Old 11th Sep 2019, 08:01
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yes. At least on the NG.
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Old 11th Sep 2019, 08:12
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It depends on the aircraft, as this is customer option.

It is either HDG SEL for takeoff, which means that as soon as you hit TOGA, you will get HDG SEL on the FMA, or it is wings level in which case the roll FMA will be blank.
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Old 11th Sep 2019, 10:36
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Customer options. Ours engage HDG SEL, but there is an airframe or two in the fleet that don't.
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Old 11th Sep 2019, 10:42
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As a very old fossil, why don't you just fly the aeroplane?
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Old 11th Sep 2019, 10:59
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Originally Posted by Bergerie1 View Post
As a very old fossil, why don't you just fly the aeroplane?
One can do that and at the same time want to understand how the automation behaves i.e. what to expect from it.
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Old 11th Sep 2019, 11:07
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If one is doing a course on the 737, why not ask your instructor?
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Old 12th Sep 2019, 03:59
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Originally Posted by Small cog View Post
If one is doing a course on the 737, why not ask your instructor?
1. Why have this forum if not to ask questions?
2. There are also instructors here.
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Old 12th Sep 2019, 06:27
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I would imagine that the OP will be training for a particular model/variant of the B737 and probably taking an examination too. Why confuse the matter?
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Old 15th Sep 2019, 05:22
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As mentioned it depends. Certainly on the classics and on some NGs the HDG SEL will become active on the FMA at 400

Until then the roll mode will be blank and FD bars will command wings level
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