So with an approved autopilot one's single pilot limits are 250' (200 x 1.25) and 600m RVR (not 550 because a DH of 250 requires the extra 50'. (4.3.1)
The above applies only in UK airspace and
possibly (that bit is often hard to unravel in the ANO) applies to G-reg only.
What about an N-reg landing in Germany (JAR-FCL plus probably local gold plating)?
What about an N-reg landing in Spain (JAR-FCL but probably without gold plating because nobody in the Spanish CAA can understand these regs)?
What about an N-reg landing in Croatia (non-EU but JAR-FCL)?
What about an N-reg landing in Ethiopia? That one, surely, must be simply the more stringent of a) the flight manual limits and b) wot it sez on the Jepp plate
