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! |
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? |
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.
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