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Which engine is number one on a four plane?

There isn't a standard "number one" engine designation on a four-engine aircraft.

Here's why:

* Multiple numbering systems: Different aircraft manufacturers and operators might use different conventions.

* Engine location: The "number one" engine could be the leftmost, rightmost, or even frontmost engine depending on the aircraft.

* Operational context: For maintenance or operational procedures, the specific engine numbering might be determined by factors like the specific aircraft type, the intended use, or internal company policies.

To determine the "number one" engine on a specific four-engine aircraft, you would need to consult the aircraft's technical manuals or documentation.