Aircraft engine position number

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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 furthest 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 furthest from the fuselage

Six-engined aircraft

  • #1 - port outer - on the left furthest 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 furthest 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 - at the front
  • #2 - behind the fuselage

References

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  2. Power Plants