Right IRS DC Power Supply System (737-400)
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Join Date: May 2019
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Right IRS DC Power Supply System (737-400)
Dear 737 drivers,
I was wondering why the Right IRS DC Power Supply System is required to perform a dual channel autopilot approach (as per MEL)?
Is it linked to the bus powering the DC backup system?
Thanks a lot for your replies!
I was wondering why the Right IRS DC Power Supply System is required to perform a dual channel autopilot approach (as per MEL)?
Is it linked to the bus powering the DC backup system?
Thanks a lot for your replies!
It’s been a long time but here’s an educated guess:
Both IRSs are required for a dual channel AP approach.
In the event of loss of AC power to the IRSs, the Left IRS has a dedicated supply from the battery bus.
To keep the right IRS going, a separate DC supply would be required.
Sounds reasonable?
Both IRSs are required for a dual channel AP approach.
In the event of loss of AC power to the IRSs, the Left IRS has a dedicated supply from the battery bus.
To keep the right IRS going, a separate DC supply would be required.
Sounds reasonable?
Join Date: Jan 2018
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Following a loss of AC power source, the right IRS will be powered by a DC power source (can't remember which now) for 5 minutes, then it is shut off to prevent quicker battery discharge.