Service difficulty report · Spring Assy · Cessna 172S

Difficulty date
September 6, 2019
Submitted
September 6, 2019
Operation
General aviation
Aircraft
N647SP
Make and model
Cessna 172S
Aircraft serial
172S8054
Aircraft time
8,570 hours
Part
Spring Assy
Part number
05411989
Condition
Broken
Location
Lt Mlg
Part time
8,570 hours
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

ON AUGUST 15, 2019 AT 1355 EASTERN DAYLIGHT TIME, RECEIVED MINOR DAMAGE WHILE LANDING AT AIRPORT (MIV). THERE WERE NO INJURIES TO EITHER OF THE TWO PILOTS ON BOARD. THE INSTRUCTIONAL FLIGHT WAS CONDUCTED UNDER THE PROVISIONS OF TITLE 14 CODE OF FEDERAL REGULATIONS PART 141. VISUAL METEOROLOGICAL CONDITIONS PREVAILED FOR THE DURATION OF THE FLIGHT AND THE PILOTS REPORTED THAT THERE WERE NO MECHANICAL PROBLEMS WITH THE AIRCRAFT PRIOR TO THE INCIDENT. THE PILOTS REPORTED THAT THEY DEPARTED AIRPORT (0W3), ON AN INSTRUMENT APPROACH TRAINING FLIGHT, LANDING AT AIRPORT (MIV). AFTER A NORMAL LANDING AND ROLLOUT ON RUNWAY 10, THE PILOTS SLOWED TO NORMAL TAXI SPEED AND BEGAN TO EXIT THE RUNWAY ONTO TAXIWAY C. AT THAT MOMENT, THE LEFT MAIN LANDING GEAR COLLAPSED. THE INSTRUCTOR PILOT EXECUTED AN EMERGENCY ENGINE SHUTDOWN PROCEDURE AS THE AIRCRAFT CAME TO A STOP ON TAXIWAY C, FIFTY FEET NORTH OF RUNWAY C. THE TWO PILOTS EXITED AND SECURED THE AIRCRAFT. EXAMINATION OF THE AIRPLANE BY A FAA INSPECTOR REVEALED DAMAGE TO THE LEFT MAIN LANDING GEAR, LEFT ELEVATOR, RUDDER LOWER TIP COVER, AND REAR TIE DOWN BOLT. THE LEFT MAIN LANDING GEAR SPRING WAS BROKEN, CAUSING THE TAIL OF THE AIRCRAFT TO CONTACT THE RUNWAY. THE UNDERSIDE OF THE LEFT ELEVATOR WAS GROUND AWAY, EXPOSING THE INTERNAL STRUCTURE. THE TAIL TIE DOWN WAS BROKEN OFF, AND THE RUDDER LOWER TIP COVER WAS DAMAGED. THE BROKEN LEFT HAND MAIN LANDING GEAR SPRING SHOWS EVIDENCE OF A HIGH STRESS OVERLOAD FRACTURE. NO EVIDENCE OF METAL FATIGUE OR CORROSION WAS OBSERVED ON THIS PART; HOWEVER, IT CANNOT BE DETERMINED WHETHER THE PART FAILED DUE TO A HARD LANDING OR RESULTED FROM PREVIOUSLY UNDETECTED DAMAGE. ADDITIONALLY, THE AREA WHERE THE BREAK OCCURRED IS NORMALLY HIDDEN FROM VIEW BY THE LANDING GEAR SHROUD. THIS COULD HAVE PREVENTED DETECTION OF DAMAGE DURING A PREFLIGHT INSPECTION OF THE AIRCRAFT. WHEN ASKED IF HE INTENDED TO SUBMIT A SERVICE DIFFICULTY REPORT FOR THE LANDING GEAR ASSEMBLY, THE OWNER OF AIR SERVICES, REPLIED THAT HE DID NOT INTEND TO.

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