Date:May. 31, 2020


Brief Description:Another tool to add to the collection of home-built gear.

Take the surpise leak out before the next Pitot/Static Check!

The biennial IFR check came due for N7ZK.  As I don’t like surprises and per Carl’s direction decided it a good idea to fashion a static tester to ensure there were no leaks in my static system before the meter $tarted at the avionics shop.  I had a 60ml plastic syringe laying around from the Numatx squeezer, went to Harbor Freight for a dual suction cup lifter, JO-Ann Fabric store for some large suction cups, and AutoZone for some fuel like and a vacuum line adapter.  Also dropped by Ace Hardware for a spring.  Assembly is simple,

  1. drill a hole in the dual suction cup lifter
  2. drill a hole in the clear suction cup
  3. slide clear suction cup onto vacuum adapter
  4. pop the spring around the vacuum line adapter and in line between the clear suction cup and the lifter
  5. slip fuel line onto other end of vacuum adapter
  6. slide fuel line onto plastic syringe

I ended up adding a few washers on either end of the spring as well as cutting the spring down a bit.  The unit works well.  I drew down enough vacuum for 1,500 feet on the altimeter for the leak test.  This required around 10ml of air to be pulled from the system.  I made the fuel line 8′ long so I could walk over the the open door on the plane and peer in to see the altimeter.  The syringe will want to release the vacuum by sucking in the plunger back in so I just held the plunger with my hand at the 10ml mark.  This worked well for the leak test.  Don’t forget to add a piece of tape to cover the other static port (if equipped).  Additionally do not pull more than 1500′ of vacuum with out also pulling down the pitot and AOA as well.  This can be done with a T on the fuel line, and adding a piece of tube leading to another hose slipped onto the pitot tube.  Doing this will also test the AOA and pitot for leaks as well.