Definition
A condition on a dual-pointer instrument, most commonly a twin-engine tachometer or synchroscope display, in which two needles are aligned and rotating together, indicating that the two engines or rotating components they represent are operating at the same RPM.
Plain English
Two indicator needles sitting exactly on top of each other, showing that the two things they measure are running at the same speed.
Context Anchor
Seen in helicopter cockpit instrument checks, normal powered flight, autorotation practice, and power recovery.
Derivation
An informal pilot term. The needles are described as 'married' because they sit one directly on top of the other and move together, like two things joined as one.
Why Pilots Care
Coordinated turns reduce drag, improve aircraft performance, and help prevent disorientation.
Intuition Check
“Married” does not mean anything legal or personal here. It means the two instrument pointers are aligned together on the same indication.
Example Sentence 1
After the gear came up, the pilot adjusted the right throttle until the needles were married, smoothing out the vibration in the cabin.
Example Sentence 2
If the needles are not married, the pilot applies rudder pressure to bring the ball back into alignment.