As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O THE NLG DID NOT GO UP. PROCEDURES CHECKLIST WERE ACCOMPLISHED. AIRCRAFT WAS TURNED BACK TO BOGOTA. AIR VALVE WAS REPLACED. WAS ACCOMPLISHED SERVICE ON SHOCKSTRUT AND PERFORMED RETRACTION TEST IAW AMM 32-30-00 PAG 1. RESULTS SATISFACTORY.