What was found
ON PREFLIGHT INSP, APPLIED A +/- 5 LB UP AND DOWN FORCE ON RT STABILIZER TIP AND HEARD A GRUNTING SOUND. FURTHER INVESTIGATION REVEALED A SMALL RELATIVE MOTION BETWEEN STABILIZER AFT FITTING, 0432005-2, AND FUSELAGE. REMOVING NUT, OPENED A 0.020 INCH AIR GAP BETWEEN THE FITTING AND FUSELAGE. CLEANING GAP WITH A CLOTH DIDN’T SHOW ANY METAL PARTICLES. FIX WAS TO FABRICATE A 0.020 INCH SHIM. FITTING IS A VERY RIGID CHANNEL THAT IF THERE WAS AN AIR GAP IT MAY NOT CLAMP ON TO FUSELAGE FITTING HARD ENOUGH WITH BOLT TORQUE. THIS MAY NOT BE A DEFECTIVE PART, JUST TOLERANCE STACK UP. LT SIDE FITTING WAS CHECKED. IT REQUIRED A 0.010 INCH SHIM.THESE 2 AFT MOUNTING POINTS ARE LOAD CYCLED MORE FREQUENTLY.