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IFR ops on unlighted runway

You’re correct that the table becomes AMC, but not about the significance of that change. If you look at the “Rationale” to NCO.OP.210 set out on page 41 of the NPA, you’ll see:

By implementing rule, use of a minimum RVR of less than 550 m requires the operator to hold an approval according to SPA.LVO.110. Otherwise, NCO.GEN.101 establishes the right of a pilot-in-command under Part-NCO to use alternative means of compliance, without any other conditions or obligations, and, therefore, to use RVR minima less than those calculated according to AMC3 NCO.OP.110.

There is no requirement for AltMoC to Part-NCO to be approved. It doesn’t even have to provide an equivalent level of safety. It is therefore, in some ways, more useful than GM, because complying with AMC is a sufficient but not necessary condition for compliance with the rule.

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