On January 26, 1988, a Cessna T310R (registration N5120J) was involved in an aviation accident near Urbana, IL. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
After a complete electrical failure, the gear was manually extended and a precautionary landing was made. During rollout, the landing gear collapsed. Investigation revealed insufficient manual gear extension turns and a low battery condition.
Incident
An aircraft experienced a complete electrical failure in flight. The pilot manually extended the landing gear and executed a precautionary landing. During the landing rollout, the landing gear collapsed. No further details about the aircraft type, registration, or occupants were provided in the source.
Investigation
Subsequent investigation determined that 10 turns remained on the manual gear extension crank to place the landing gear in the down and locked position. No mechanical problem could be found to attribute to the loss of electrical power, other than a low battery condition. The entire electrical system functioned normally during testing. The position of the battery switch and the left and right alternator switches at the time of the accident could not be verified. No probable cause was stated in the source.