737 IRS alignment
Join Date: Apr 2010
Location: IRS NAV ONLY
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Boeing’s guidance is to use the most accurate source of position information for IRS alignment.
If your airline prefers GPS L, it is likely because MMR 1 is powered by the AC standby bus, and will likely get a valid GPS fix before MMR 2 (GPS R).
If your airline prefers GPS L, it is likely because MMR 1 is powered by the AC standby bus, and will likely get a valid GPS fix before MMR 2 (GPS R).
Join Date: Jan 2023
Location: EU
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Correct 👍 No other reason, they're identical in every way except for their power source.