20230714008869A

Accident · Substantial damage

FAA accident report · Air Tractor AT-802 · Benson, MN · July 14, 2023

Date
July 14, 2023 · 16:30 local
Place
Benson, MN
Phase of flight
Maneuver
Operating rules
Agricultural (Part 137)
Operator
5BFG
Damage
Substantial damage
Aircraft
N22FK
NTSB investigation
NTSBCEN23LA311
Reported as
Air Tractor AT-802
Reported engine
Pratt & Whitney Canada PT6A-67AG
People aboard
1
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Commercial pilot
Pilot’s flight hours
7,000 total1,200 in this make and model200 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

While applying pesticide to a field the aircraft struck 2 power lines. The PIC did not notice anything abnormal with the aircraft, so he continued spraying until empty then returned to the airport. After shutdown the PIC inspected the aircraft and noticed a nick in the prop, missing vortex generators (vg’s) and a damaged delta wing on the right wing. The PIC continued spray operations before flying approximately 80 miles to his home airport. The following day the PIC continued 137 spray operations for several hours. Two days after the accident the mechanic that maintains the aircraft performed an inspection and found a damaged aileron. After discovering the damage, the mechanic told the PIC that the aircraft was not airworthy and would have to be repaired prior to further flight. Six days after the accident FAA inspectors examined the aircraft finding damage including a 12 inch cut in the bottom side of the right aileron, visible dents and paint cracking in the top of the right aileron, 7 missing vg’s, 4 damaged vg’s, damaged delta wing, multiple dents on leading edges of both wings, bent propeller tip that had been straightened, large nick in propeller blade that had been recently dressed, and signs of electrical arcing on propeller blade. Engine had been disassembled and power section sent out for prop sudden stoppage inspection.

As the FAA filed it

WHILE APPLYING PESTICIDE TO A FIELD THE AIRCRAFT STRUCK 2 POWER LINES. THE PIC DID NOT NOTICE ANYTHING ABNORMAL WITH THE AIRCRAFT, SO HE CONTINUED SPRAYING UNTIL EMPTY THEN RETURNED TO THE AIRPORT. AFTER SHUTDOWN THE PIC INSPECTED THE AIRCRAFT AND NOTICED A NICK IN THE PROP, MISSING VORTEX GENERATORS (VG’S) AND A DAMAGED DELTA WING ON THE RIGHT WING. THE PIC CONTINUED SPRAY OPERATIONS BEFORE FLYING APPROXIMATELY 80 MILES TO HIS HOME AIRPORT. THE FOLLOWING DAY THE PIC CONTINUED 137 SPRAY OPERATIONS FOR SEVERAL HOURS. TWO DAYS AFTER THE ACCIDENT THE MECHANIC THAT MAINTAINS THE AIRCRAFT PERFORMED AN INSPECTION AND FOUND A DAMAGED AILERON. AFTER DISCOVERING THE DAMAGE, THE MECHANIC TOLD THE PIC THAT THE AIRCRAFT WAS NOT AIRWORTHY AND WOULD HAVE TO BE REPAIRED PRIOR TO FURTHER FLIGHT. SIX DAYS AFTER THE ACCIDENT FAA INSPECTORS EXAMINED THE AIRCRAFT FINDING DAMAGE INCLUDING A 12 INCH CUT IN THE BOTTOM SIDE OF THE RIGHT AILERON, VISIBLE DENTS AND PAINT CRACKING IN THE TOP OF THE RIGHT AILERON, 7 MISSING VG’S, 4 DAMAGED VG’S, DAMAGED DELTA WING, MULTIPLE DENTS ON LEADING EDGES OF BOTH WINGS, BENT PROPELLER TIP THAT HAD BEEN STRAIGHTENED, LARGE NICK IN PROPELLER BLADE THAT HAD BEEN RECENTLY DRESSED, AND SIGNS OF ELECTRICAL ARCING ON PROPELLER BLADE. ENGINE HAD BEEN DISASSEMBLED AND POWER SECTION SENT OUT FOR PROP SUDDEN STOPPAGE INSPECTION.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.