Aircraft engine position number

Thrust levers in a Boeing 727 with the engine number on each lever

On multi-engined aircraft, aircraft engine positions are numbered from left to right from the view of the pilot looking forward.^[1]

Wing and rear-mounted engines

Twin-engined aircraft

#1 - port - on the left
#2 - starboard - on the right

Three-engined aircraft

#1 - port - on the left
#2 - centre - on the centerline
#3 - starboard - on the right

Four-engined aircraft

#1 - port outer - on the left farthest from the fuselage
#2 - port inner - on the left nearest to the fuselage
#3 - starboard inner - on the right nearest to the fuselage
#4 - starboard outer - on the right farthest from the fuselage

Six-engined aircraft

#1 - port outer - on the left farthest from the fuselage
#2 - port middle - on the left between #1 and #3
#3 - port inner - on the left nearest to the fuselage
#4 - starboard inner - on the right nearest to the fuselage
#5 - starboard middle - on the right between #4 and #6
#6 - starboard outer - on the right farthest from the fuselage

Other configurations

Centerline

The English Electric Lightning has two jet engines on the centerline one above the other.^[2]

#1 - below and to the front of #2
#2 - above and to the rear of #1

The twin boom Cessna 337 Skymaster one engine forward and one engine aft.

#1 - protruding forward of the cabin, at the front of the fuselage
#2 - aft of the cabin, embedded within the rear of the fuselage

References

↑ National Business Aircraft Association (1952). Skyways for business. Henry Publications. p. 52.
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