CAG2

SOURCE SEL IRS

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Hi everyone,

I was flying a 12 hour flight across the pacific. Suddenly this message popped up:

>SOURCE SEL IRS

It popped up after I accidentally disabled the autopilot. How do I fix the problem? Thanks

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21 minutes ago, CAG2 said:

Hi everyone,

I was flying a 12 hour flight across the pacific. Suddenly this message popped up:


>SOURCE SEL IRS

It popped up after I accidentally disabled the autopilot. How do I fix the problem? Thanks

Did you have a look in the FCOM? There are lists of EICAS messages in there and what they mean

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That would be in QRH, not in the FCOM. This particular message would be on page 10.12.

You were probably playing around with the knobs, and selected both C and FO FMSs to use the same IRS source.

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5 minutes ago, icemarkom said:

That would be in QRH, not in the FCOM. This particular message would be on page 10.12.

You were probably playing around with the knobs, and selected both C and FO FMSs to use the same IRS source.

Oops!! My bad apologies if you went hunting in the wrong manual!

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I wasn't, but we don't want folks with less time on their hands doing that.

It's generally easy to remember what's where:

  1. Everything is normal: FCOM
  2. Something's wrong: QRH
  • Upvote 1

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The FCOM also has the EICAS messages defined, by system. The QRH will tell you what to do if the message appears. The FCOM will tell you what causes the message to appear.

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Also useful to know: the caret (>) symbol appears before items where the associated checklist is for information only, has no procedural steps, or the action is obvious (e.g. >OVERSPEED, >AUTOTHROT DISC, >FUEL TANK/ENG etc).

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