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NTSB Report
May 18, 1984 · Grumman G-164A · N9822
Wiggins, CO
Overview
Report Status
Preliminary report
Event Type
Accident
Date
May 18, 1984
Injury Outcomes
No injuries (1 uninjured)
Location
Wiggins, CO
Aircraft
Grumman G-164A
Tail Number
N9822
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN84LA153
WHILE EN ROUTE TO A FIELD FOR AERIAL APPLICATION, AN OIL MIST APPEARED ON THE WINDSHIELD OF THE ACFT. SHORTLY AFTER THAT, THE ENG PROGRESSIVELY LOST POWER & THE PLT MADE A FORCED LANDING IN A PASTURE. DURING THE LANDING ROLL, THE ACFT HIT A HOLE IN THE GROUND & NOSED OVER. AN EXAM OF THE ENG REVEALED THAT THE EXHAUST ROCKER BOX ON THE #1 CYLINDER HAD CRACKED & SEPARATED WHERE THE OIL LINES WERE ATTACHED. THERE WERE 2 PRATT & WHITNEY SERVICE BULLETINS CONCERNING R-1340-AN1 CYLINDERS THAT WERE NOT COMPLIED WITH. SB-1720 RECOMMENDED AN INSPECTION OF THE CYLINDER HEADS DURING OVERHAUL. SB-1743 CALLED FOR REPLACEMENT OF ALL CYLINDERS WITH IMPROVED CYLINDERS HAVING A 5/8 INCH REENFORCEMENT WEB ON THE EXHAUST ROCKER BOX. THE OLD CYLINDERS HAD 1/2 INCH WEB. THE ACFT HAD FLOWN 360 HRS SINCE THE LAST MAJOR OVERHAUL.
Full Narrative
WHILE EN ROUTE TO A FIELD FOR AERIAL APPLICATION, AN OIL MIST APPEARED ON THE WINDSHIELD OF THE ACFT. SHORTLY AFTER THAT, THE ENG PROGRESSIVELY LOST POWER & THE PLT MADE A FORCED LANDING IN A PASTURE. DURING THE LANDING ROLL, THE ACFT HIT A HOLE IN THE GROUND & NOSED OVER. AN EXAM OF THE ENG REVEALED THAT THE EXHAUST ROCKER BOX ON THE #1 CYLINDER HAD CRACKED & SEPARATED WHERE THE OIL LINES WERE ATTACHED. THERE WERE 2 PRATT & WHITNEY SERVICE BULLETINS CONCERNING R-1340-AN1 CYLINDERS THAT WERE NOT COMPLIED WITH. SB-1720 RECOMMENDED AN INSPECTION OF THE CYLINDER HEADS DURING OVERHAUL. SB-1743 CALLED FOR REPLACEMENT OF ALL CYLINDERS WITH IMPROVED CYLINDERS HAVING A 5/8 INCH REENFORCEMENT WEB ON THE EXHAUST ROCKER BOX. THE OLD CYLINDERS HAD 1/2 INCH WEB. THE ACFT HAD FLOWN 360 HRS SINCE THE LAST MAJOR OVERHAUL.
Flight
Event TypeAccident
Event Time06:40 MDT
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164A
Tail NumberN9822
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340-AN1 · Reciprocating · 600
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 58 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point55 / 0 C
Altimeter0
Observation Time06:40
Weather SourcePILO