DESCRIPTION OF ACCIDENT:  "The cause of the loss was the collapse of the aircraft’s main landing gear roughly 800’ after the aircraft touched down at the McGee Tyson Airport in Knoxville, TN."  "The nose gear stayed down and locked, so the failure was within the main landing gear down lock system."

AIRCRAFT:  1977 Beechcraft King Air C90    N25DL   S/N: LJ-716   TT: ~9587.4

ENGINE:  Pratt & Whitney   Model:  PT6A-21   S/N: PC-E 24364   TT: -9528   TSMOH: ~2574.7

ENGINE:  Pratt & Whitney   Model:  PT6A-21   S/N: PC-E 24410   TT: -9528   TSMOH: ~2574.7

PROPELLER:  Hartzell   Model:  HC-D4N-3C/D9290K   S/N:  FY3324   TT: ~218.4

PROPELLER:  Hartzell   Model:  HC-D4N-3C/D9290K   S/N:  FY3326   TT: ~218.4

Date of Accident:  April 9, 2019

Date of Last Annual Inspection: ; April 8, 2019, Complied with phase 1-4 inspection

EQUIPMENT: 

Garmin GMA 340

Garmin GMS 530

Garmin GNS 430

Garmin GTX 330

Garmin GTX 327

Avidyne FlightMax Ex500

DESCRIPTION OF DAMAGES: 

Damage to belly skin, inboard and outboard flaps, one propeller, gear doors, landing gear

The damage noted during our survey lists as follows:

The ventral fin sustained damage

The left and right tail strakes are damaged

The tail stinger/cone with nav lamp assembly is damaged

There is an indentation in the aft fuselage belly within the pressure bulkhead

There are several belly skins near the cabin entrance door on the aircraft’s belly that were abraded from sliding on the runway

The left and right inboard and outboard flaps are damaged

The left propeller has dirt on its blades but does not appear to have hit the ground.  The propeller may require inspection to verify that it was not damaged

There is minor damage to two blades of the right propeller

Due to the right propeller strike, the power section from the right-side Pratt and Whitney PT6A-21 series engine will require a tear down inspection

The nose and main gear doors may require replacement or repair pending further inspection

The nose wheel and tire assembly appear damaged

The trailing edge of the left and right inboard wings are damaged from the recovery lifting straps

The inboard leading edge of the horizontal stabilator’s left and right side is damaged

The main landing gear and nose landing gear components are damaged

There is possible spar damage to the wing’s center section

LOCATION OF AIRCRAFT:    Tac Air, Knoxville TN

SALVAGE MAY BE INSPECTED BY CONTACTING:  Jim Cohrs (770) 570-7473

REMARKS:  Aircraft logbook entry 11/21/20019:  Installed Raisebeck Quiet Turbo Fan Propeller System per STC SA3593NM issued Sept 12, 1986 and NTO letter dated Sept 28, 2009 for majicam installation without Autofeather system.

NOTE:  A backhoe was used to lift straps that were placed around the wing roots from front to aft.  The straps cut into the left and right wing roots and the left and right side of the horizontal was pushed in due to strap pressure.   They also pulled the aircraft by its nose gear by placing the nose wheel into the bucket of the backhoe and pulling it.