What was found
FLIGHT CREW REPORTED THAT DURING TAXI OPERATION TOWARDS THE RUNWAY, THE NR 1 ENGINE BEGIN TO SURGE. CREW THEN RETURNED BACK TO FBO. MAINTENANCE TROUBLESHOT THE SYSTEM TO A FAULTY HMU. MX TEAM INSTALLED A REPAIRED HMU, AND NOTICED THAT DURING ENGINE GROUND RUNS, THE ENGINE WAS STILL SURGING. FURTHER TROUBLESHOOTING DETERMINED A FAULITY BOV SOLENOID VALVE. MX TEAM INSTALLED AN O/H BOV SOLENOID VALVE, PN 31B4197-05. ENGINE GROUND RUNS AND LEAK CHECK WERE PERFORMED WITH NO DEFECTS NOTED. THE ACFT WAS THEN RETURNED TO SERVICE.