I’ve heard on accasions that Manually created engine-out SIDs , if actually used in engine-out conditions , should not be flown in managed guidance (NAV mode in airbus terminology / LNAV mode in Boeing terminology ) but should be flown in Selected guidance ( I,e heading mode ) . Is anyone aware of this and where this piece of information can be found ? ( I was told it could be found in the Airbus FCOM ( couldn’t find it ) and was later told that was mentioned in ICAO documentation ...