What was found
THIS HYDRAULIC LINE RUNS FROM THE EMERGENCY BLOW DOWN BOTTLE TO THE SHUTTLE VALVE IN THE NOSE COMPARTMENT. WHEN WE PULLED THE BLOW DOWN LEVER THE LINE BLEW OFF THE BOTTLE FITTING SO THE LANDING GEAR DID NOT COME DOWN. FOUND THE LINE HAD A SINGLE FLARE THAT FAILED WHEN 1800PSI WAS APPLIED. UPON INSPECTION FOUND THAT THE LINE LOOKED LIKE IT WAS NOT THE ORIGINAL LINE. CESSNA CALLS FOR DOUBLE FLARES ON BOTH ENDS, AND BOTH WERE SINGLE FLARE.