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19990728010079A

Accident · Destroyed
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FAA accident report · Ayres S-2R · Isola, MS · July 28, 1999

FAA Aviation Safety Information Portal

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Date
July 28, 1999 · 06:50 local
Place
Isola, MS
Phase of flight
Fcd/Prec Ldg From Cruise
Operating rules
Agricultural (Part 137)
Operator
KZWG
Damage
Destroyed
Aircraft
N8482V
NTSB investigation
NTSBMIA99LA204
Reported as
Ayres S2R
Reported engine
Pratt & Whitney R1340AN1
Fatal injuries
0
Pilot’s flight hours
12,888 total11,476 in this make and model148 in the last 90 days
N8482VRegistration cancelled Aug 2, 2012 · Rockwell International S-2RS/N 2242RAirframe modelRockwell International S-2R

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.

Acft was involved in aerial application when it lost engine oil pressure, the engine failed, and the acft struck trees while attempting to land, other circumstances are unknown. (-23) pilot stated he heard three loud bangs and what appeared to be black smoke from exhaust stack. Engine power was lost after the third bang and emergency landing was initiated in a rough overgrown field. Landing gear collapsed and aircraft was consumed by fire. (.4) while performing aerial application the pilot stated the engine backfired twice, lost oil pressure, backfired again, and then shutdown. While making a forced landing the aircraft collided with a ditch and a post crash fired erupted, which destroyed the aircraft. Postcrash examination of the engine under FAA supervision showed the no. 4 cylinder had compression of 35 over 80 PSI., and was leaking through the intake valve. Also, 7 of 18 valves were not adjusted within manufacturer's limits and all spark plug gaps were adjusted above manufacturer's limits.

As the FAA filed it

ACFT WAS INVOLVED IN AERIAL APPLICATION WHEN IT LOST ENGINE OIL PRESSURE, THE ENGINE FAILED, AND THE ACFT STRUCK TREES WHILE ATTEMPTING TO LAND, OTHER CIRCUMSTANCES ARE UNKNOWN. (-23) PILOT STATED HE HEARD THREE LOUD BANGS AND WHAT APPEARED TO BE BLACK SMOKE FROM EXHAUST STACK. ENGINE POWER WAS LOST AFTER THE THIRD BANG AND EMERGENCY LANDING WAS INITIATED IN A ROUGH OVERGROWN FIELD. LANDING GEAR COLLAPSED AND AIRCRAFT WAS CONSUMED BY FIRE. (.4) WHILE PERFORMING AERIAL APPLICATION THE PILOT STATED THE ENGINE BACKFIRED TWICE, LOST OIL PRESSURE, BACKFIRED AGAIN, AND THEN SHUTDOWN. WHILE MAKING A FORCED LANDING THE AIRCRAFT COLLIDED WITH A DITCH AND A POST CRASH FIRED ERUPTED, WHICH DESTROYED THE AIRCRAFT. POSTCRASH EXAMINATION OF THE ENGINE UNDER FAA SUPERVISION SHOWED THE NO. 4 CYLINDER HAD COMPRESSION OF 35 OVER 80 PSI., AND WAS LEAKING THROUGH THE INTAKE VALVE. ALSO, 7 OF 18 VALVES WERE NOT ADJUSTED WITHIN MANUFACTURER'S LIMITS AND ALL SPARK PLUG GAPS WERE ADJUSTED ABOVE MANUFACTURER'S LIMITS.

NTSB investigation

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

NTSB MIA99LA204Accident · Serious injuriesLimited investigationFinal reportIsola, MSFailure of the No. 4 cylinder due to a leaking intake valve resulting in loss of engine power and collision with a ditch while making a forced landing on unsuitable terrain. Contributing to the accident was improper maintenance adjustment of the engine valves…Jul 28, 1999 · Destroyed