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Flat Plane Vs Cross Plane V8 engines. A flat plane V8 (animated on the left) is very much like two inline-4 engines mated together in a V configuration. Therefore end-to-end balance is inherent, as the first and last piston of a bank is always exactly in the same position, as are the center two pistons on each bank.
This policy is known as the âflat tire rule,â though you wonât find it on most airlinesâ websites. Ironically, a flat tire is a mechanical failure, which is considered to be outside the control of customers (when driving their own car), even though aircraft maintenance delays are considered within the control of airlines. How This Works in Practice: Since the rule isnât publicly documented, it can be hard for passengers to invoke it.