What was found
THIS RVSM AIRCRAFT HAD AN ALTIMETRY SYSTEM SPLIT. CONTACTED STC GROUP HOLDER FOR PROPER ROUTING OF STATIC SYSTEM PLUMBING. FOUND CO-PILOTS SYSTEM WAS NOT CROSS COUPLED WITH PILOTS SYSTEM. INSTALLED FABRICATED HOSES TO THE CO-PILOTS SYSTEM TO MEET STC NR ST 00563DE-D. PROBABLE CAUSE: CO-PILOTS STATIC SYS NOT CROSS-COUPLED AT STC INSTALLATION OR SYSTEM WAS MODIFIED/ ALTERED POST-STC WITHOUT APPROVED DATA. (K)