Installing Aircraft Hose - The 10 Rules




      Hose chafe damage hidden inside firesleeve

  1. Minimize fluid connections. Each connection is another potential point of failure. The fewer hoses the better.
  2. Each hose shall have a bend. Hoses should never travel straight from connection to connection.
  3. Electrical wires should not be attached to flammable fluid carrying hoses.
  4. Hoses should not touch other objects in a way that they might rub and chafe. Outside steel braid hose "hack-saw hose" can cut through steel and aluminum.
  5. Hoses should not pull or tug at the fitting they are attached to. Hose should not be forced into position to get the "B" nut to thread. Do not use the attachment fitting as a bracket to hold the hose in position. If you think you need a "steel" fitting rather than aluminum because it's stronger; ask yourself why does the fitting need to be stronger? 
  6. Hydraulic hoses should have a pressure rating + safety factor greater than the IMPULSE pressure. Hydraulic impulses can be many times the "operating pressure".
  7. Flammable fluid carrying lines in the engine compartment shall be firesleeved.
  8. Inspect hoses for chafing with your hands. The chafe point is not visible since it is against the chafee.
  9. Hoses shall  not touch exhaust components. 
  10.  Oil lines in the engine compartment that travel next to or along exhaust components shall be firesleeved. Protects the hose in case of exhaust system crack or failure.


      An old hose can look good on the outside -- this hose passed many visual inspections!


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