As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED MAIN LANDING GEAR FAILED TO EXTEND. CREW HAD TO DO AN EMERGENCY GEAR EXTENSION TO LOWER GEAR. EMERGENCY DECLARED AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND SAFTEY VALVE 49GA FAILED. REPLACED THE SAFETY VALVE IAW STANDARD PRACTICES. MAINTENANCE ALSO PERFORMED A SATISFACTORY OPERATIONAL CHECK.