jesus nut

[bob nelson]

HAY IM A TIN CAN SAILOR SO SOMEONE TELL ME WHAT A JESUS NUT IS ///IT WAS A QUESTION ON WHO WONTS TO BE A MILLION AIR  BUT I NEVER HEARD THE ANSWER //NO ONE KNEW THE ANSWER // VINH LONG 66   67

[Suds]

simple - its the single "nut" on the rotor mast coming up from the transmission of a helicopter that holds the rotor blades assembly on. If you are in the air in the helicopter, and if it comes off, it's time for you to meet Jesus.
Mike

[Dan Arnes]

What is a "Jesus Nut"?  
The correct term is the main rotor retaining nut, but basically if it comes off in flight your going to see your maker!  
Here is a pic of one on a UH-1B model rotor head (red arrow). Note the eye in the top for attaching cables and the like.



Dan

[Richard King]

Dan you left off the bulls eye on the green house plexiglass. Thats where an AD would always put through when changing a rotor head.