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NTSB Report
September 2, 1987 · Aero Commander 680FL · N111UA
St Thomas
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 2, 1987
Injury Outcomes
No injuries (7 uninjured)
Location
St Thomas
Aircraft
Aero Commander 680FL
Tail Number
N111UA
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA87LA238
AFTER A LOSS OF HYD PRESSURE, THE RGT MAIN GEAR WOULD NOT FULLY EXTD WHEN THE PLT TRIED TO LOWER THE GEAR FOR LNDG. ALL ATMTS TO LOCK IT INTO PLACE WERE UNSUCCESSFUL. WHEN THE ACFT TOUCHED DOWN DRG THE LNDG, THE RGT MAIN GEAR COLLAPSED.THE ACFT SLID TO A STOP & THE OCCUPANTS WERE EVACUATED. AN INSPN OF THE RGT MAIN GEAR ASSY REVEALED THE HYD ACTUATING CYL HAD FAILED AT THE SNAP RING GROOVE & THE PNEUMATIC ACTUATING CYL HAD FAILED AT THE ROD END. BOTH FAILED FM OVERLOAD.THIS WAS THE 2ND OVERLOAD FAILURE OF THE HYD ACTUATING CYL IN 26 FLT HRS OF OPN. ACCORDING TO A MECHANIC, WHO WAS FAMILIAR WITH THE ACFT, THIS FAILURE WAS CONSISTENT WITH EXCESSIVE PRESSURE IN THE SYS DUE TO A PRESSURE RELIEF/UNLOADERVALVE MALFUNCTION.
Full Narrative
AFTER A LOSS OF HYD PRESSURE, THE RGT MAIN GEAR WOULD NOT FULLY EXTD WHEN THE PLT TRIED TO LOWER THE GEAR FOR LNDG. ALL ATMTS TO LOCK IT INTO PLACE WERE UNSUCCESSFUL. WHEN THE ACFT TOUCHED DOWN DRG THE LNDG, THE RGT MAIN GEAR COLLAPSED.THE ACFT SLID TO A STOP & THE OCCUPANTS WERE EVACUATED. AN INSPN OF THE RGT MAIN GEAR ASSY REVEALED THE HYD ACTUATING CYL HAD FAILED AT THE SNAP RING GROOVE & THE PNEUMATIC ACTUATING CYL HAD FAILED AT THE ROD END. BOTH FAILED FM OVERLOAD.THIS WAS THE 2ND OVERLOAD FAILURE OF THE HYD ACTUATING CYL IN 26 FLT HRS OF OPN. ACCORDING TO A MECHANIC, WHO WAS FAMILIAR WITH THE ACFT, THIS FAILURE WAS CONSISTENT WITH EXCESSIVE PRESSURE IN THE SYS DUE TO A PRESSURE RELIEF/UNLOADERVALVE MALFUNCTION.
Flight
Event TypeAccident
Event Time19:25 UTC
Nearest AirportCyril E. King (0nm N)
Runway9
Runway Length5358 ft
Runway Width150 ft
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAero Commander 680FL
Tail NumberN111UA
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 135
Engines2
Engine TypeReciprocating
Engine DetailsLycoming · IO-720-B1B · Reciprocating · 400
Seats7
People & Injuries
Injury SummaryNo injuries (7 uninjured)
Fatal0
Serious0
Minor0
Uninjured7
Total7
Crew 1Age 43 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind60° @ 10 kt
Visibility30 sm
CeilingNone
Altimeter29.00 inHg
Observation Time19:25
Weather SourceWFAC