Originally Posted by
vilas
No you are not reading correctly. This limit is only for APU start in ELECTRICAL EMERGENCY configuration.
Perhaps you misunderstood his question. My Operator lists "Max FL for APU Battery Start" as FL250. -Both CEO & NEO. -note that's a battery start; which is what he was asking I believe. APU Max start envelope is upto the Service Ceiling, though it's no good for Bleed Air until FL225...