B737- 400 Unknown Switch
Thread Starter
Joined: Jan 2007
Posts: 78
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From: San Francisco, California, USA
B737- 400 Unknown Switch
B737-400 half glass, I cannot find a reference to this switch anywhere, FCOM 1, 2, FCTM anywhere. To the right and left on MCP panel, it where the nav/hsi switch is on steam 400's.
Joined: Jan 2008
Posts: 1,269
Likes: 79
From: Denver
A customer option on the Classics provides for dual Alternative Navigation Systems (two inertial reference systems independent of the FMS). As an option, it won't appear on all aircraft, and presumably perhaps not in all manuals.
Navigation
Navigation
Joined: Sep 2003
Aviation Qualifications: ATPL
Posts: 955
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From: away from home
We had this on our -400s. Do you have a serial number for the aircraft in question? You can pm me if you like, I still have the old manuals tucked away, probably not more than a page or two to scan.
Joined: Mar 2007
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From: Here and there
Saw this on a -300 many years ago. It is a back up nav system and you can read more about it here-
Navigation
Navigation
Joined: Jan 2018
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From: Amantido
With a storage of 20 waypoints, this was a sort of evolution of the CIVA or Carousel navigation system that was available on the 737-200 and 747-100/200/300 and it could hold only 9 waypoints if I am not wrong. We have two -400 with this option in our fleet.
