What was found
ON TAKEOFF, AS THE CREW INITIATED THE LG RETRACTION, THEY RECEIVED A HYD A LOW QTY WARNING & SUBSEQUENTLY NOTED THE HYD QTY DROPPED TO 11%. THE ACFT DIVERTED, DECLARED AN EMER & LANDED WITHOUT FURTHER INCIDENT. DISCOVERED THE LANDING EMER PNEUMATIC STORAGE BOTTLE FAILED. THE BOTTLE WAS REPLACED. OPERATIONS & LEAK CHECKS WERE GOOD & THE ACFT RETURNED TO SERVICE.