4-68. AIR LINES AND FITTINGS MAINTENANCE (Con't).
Cut tubing with hacksaw or tube cutter, ensuring that end is smooth and cut squarely with tubing wall. Do not
crimp or partially close ends. Ream and file tubing end to remove burrs. Remove cuttings or filings.
Place nut and new compression sleeve on tube and insert end of tube in recess in fitting body.
Hold tube at bottom of recess and tighten tube nut until sufficient pressure is placed on sleeve to prevent
leakage. Do not cross thread.
Thread air tube (4) through grommets (8) and position for installation.
Install any clamps (3) or straps removed using screws (5), new Iockwashers (2), and nuts (l).
Connect each end of air tube (4).
Perform leakage test (subpara c).
With brake air couplings connected and brakes applied, coat air couplings, connectors, fittings, and tubes with
detergent and water solution and check for leaks. No leakage is permissible.
Tighten or replace fittings, air couplings, and connectors to stop leaks. Replace leaking tubes.