Originally Posted by
TimesTwo
Don't planes have backup hydraulics?
The problem is that loss of a single main hydraulic system can leave some controls without a back-up source of hydraulic power so the FAA mandates landing at the nearest
suitable airport. Think of it like engines on a twin-engined airplane - certification standards ensure that the plane will fly pretty well after loss of one engine. But with no back-up to loss of the 2nd engine a landing is required after losing the 1st engine.
Jim