[P/O W. 'Moggy' Cattermole]

dunno about your second problem mate but engines are referred to as 1,2,3,4. 1 is the far left engine, 2 the inner left, 3 the inner right and 4 the outer right. So if your left engine was inoperable on a twin engined aircraft, you'd want to repair engine 1. Hope that helps.