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NTSB Report
January 17, 1990 · Cessna 404 · N335GP
Boca Raton, FL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
January 17, 1990
Injury Outcomes
3 injuries (3 minor injuries)
Location
Boca Raton, FL
Aircraft
Cessna 404
Tail Number
N335GP
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
MIA90LA056
WHILE LEVEL AFTER DESCENDING, THE RT ENG QUIT. PLT FEATHERED THE PROP, ADVISED ATC, & WAS DIVERTING TO ALTERNATE WHEN LT ENG QUIT. HE POSITIONED THE LT ENG BOOST PUMP TO HIGH & LOW WITH NEGATIVE RESULTS, BUT DID NOT FEATHER THE PROP. POSITION OF BOOST PUMPS, WHEN ENGS QUIT, WAS NOT DETERMINED. ACFT LANDED ON OVERPASS THAT WAS UNDER CONSTRUCTION. THERE WAS FUEL LEAKAGE AFTER ACCIDENT DUE TO ACFT DAMAGE. FUEL QUANTITY WAS SUFFICIENT. EXAM OF ACFT REVEALED RT ENG FLEXIBLE DUCT FROM TURBOCHARGER TO PLENUM CHAMBER SEPARATED DUE TO LOOSE CLAMP. HOSE WAS INSTALLED & CLUB PROP INSTALLED FOR EACH ENG RUN. BOTH ENGS OPERATED NORMALLY. INDUCTION AIR HOSE WAS PULLED DURING RT ENG RUN. ENG RAN ROUGH DUE TO EXCESSIVE RICH MIXTURE. NO DETERMINATION COULD BE MADE FOR THE REASON OF THE LEFT ENG POWER LOSS.
NTSB Probable Cause
LOSS OF POWER IN THE RIGHT ENGINE DUE TO A DISCONNECTED DUCT BETWEEN THE TURBOCHARGER AND THE PLENUM CHAMBER. THE REASON FOR THE LOSS OF POWER IN THE LEFT ENGINE WAS NOT DETERMINED.
Full Narrative
WHILE LEVEL AFTER DESCENDING, THE RT ENG QUIT. PLT FEATHERED THE PROP, ADVISED ATC, & WAS DIVERTING TO ALTERNATE WHEN LT ENG QUIT. HE POSITIONED THE LT ENG BOOST PUMP TO HIGH & LOW WITH NEGATIVE RESULTS, BUT DID NOT FEATHER THE PROP. POSITION OF BOOST PUMPS, WHEN ENGS QUIT, WAS NOT DETERMINED. ACFT LANDED ON OVERPASS THAT WAS UNDER CONSTRUCTION. THERE WAS FUEL LEAKAGE AFTER ACCIDENT DUE TO ACFT DAMAGE. FUEL QUANTITY WAS SUFFICIENT. EXAM OF ACFT REVEALED RT ENG FLEXIBLE DUCT FROM TURBOCHARGER TO PLENUM CHAMBER SEPARATED DUE TO LOOSE CLAMP. HOSE WAS INSTALLED & CLUB PROP INSTALLED FOR EACH ENG RUN. BOTH ENGS OPERATED NORMALLY. INDUCTION AIR HOSE WAS PULLED DURING RT ENG RUN. ENG RAN ROUGH DUE TO EXCESSIVE RICH MIXTURE. NO DETERMINATION COULD BE MADE FOR THE REASON OF THE LEFT ENG POWER LOSS.
Flight
Event TypeAccident
Event Time00:09 EST
Nearest AirportBoca Raton (1nm W)
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 404
Tail NumberN335GP
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · GTSIO-520-M · Reciprocating · 375
Seats10
People & Injuries
Injury Summary3 injuries (3 minor injuries)
Fatal0
Serious0
Minor3
Uninjured0
Total3
Crew 1Age 35 · First Class
Conditions
ConditionsVMC
LightBright Night
Wind250° @ 11 kt, gusting 11 kt
Visibility10 sm
CeilingOvercast 4000 ft
Temperature / Dew Point63 F
Altimeter30.00 inHg
Observation Time04:47
Weather SourceWFAC