As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING SLINGING OF SURVEY EQUIPMENT (SO CALLED 'MAG BIRD'). HYDRAULIC FAILURE OCCURRED. PILOT DROPPED OFF SURVEY EQUIPMENT AND MADE UNSCHEDULED LANDING. THE A/C SUSTAINED NO DAMAGE. HYDRAULIC PUMP DRIVEBELT FOUND BROKEN. BELT REPLACED, A/C RETURNED TO SERVICE.