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NTSB Report
September 6, 1982 · Aero Commander 681 · N10TN
Pontiac, MI
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 6, 1982
Injury Outcomes
No injuries (3 uninjured)
Location
Pontiac, MI
Aircraft
Aero Commander 681
Tail Number
N10TN
Operator
Trans Industries
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI82DA341
DURING CRUISE FLIGHT THE PILOT OBSERVED THE HYDRAULIC SYSTEM PRESSURE FLUCTUATING. THE PILOT IMMEDIATELY WENT INTO A HOLD PATTERN AND ATTEMPTED TO ASCERTAIN THE PROBLEM. AFTER REPEATED ATTEMPTS THE PILOT WAS ABLE TO LOWER THE NOSE GEAR AND THE RIGHT MAIN GEAR. DURING FINAL APPROACH FOR THE EMERGENCY LANDING THE PILOT FEATHERED THE LEFT ENGINE AND ON TOUCHDOWN THE RIGHT ENGINE WAS FEATHERED. TOUCHDOWN WAS MADE ON THE RIGHT GEAR WITH FULL RIGHT AILERON. THE PILOT LOST AILERON LIFT AND THE AIRCRAFT SETTLED ONTO THE LEFT GEAR AND THE GEAR COLLAPSED. INVESTIGATION REVEALED THAT THE LEFT, MAIN GEAR HYDRAULIC SYSTEM PLUMBING HAD A FATIGUE HAIRLINE CRACK IN THE PRESSURE LINE LEADING FROM THE PUMP TO THE CYLINDER. THE FRACTURE WAS IN THE 90 DEGREE BEND OF THE LINE.
Full Narrative
DURING CRUISE FLIGHT THE PILOT OBSERVED THE HYDRAULIC SYSTEM PRESSURE FLUCTUATING. THE PILOT IMMEDIATELY WENT INTO A HOLD PATTERN AND ATTEMPTED TO ASCERTAIN THE PROBLEM. AFTER REPEATED ATTEMPTS THE PILOT WAS ABLE TO LOWER THE NOSE GEAR AND THE RIGHT MAIN GEAR. DURING FINAL APPROACH FOR THE EMERGENCY LANDING THE PILOT FEATHERED THE LEFT ENGINE AND ON TOUCHDOWN THE RIGHT ENGINE WAS FEATHERED. TOUCHDOWN WAS MADE ON THE RIGHT GEAR WITH FULL RIGHT AILERON. THE PILOT LOST AILERON LIFT AND THE AIRCRAFT SETTLED ONTO THE LEFT GEAR AND THE GEAR COLLAPSED. INVESTIGATION REVEALED THAT THE LEFT, MAIN GEAR HYDRAULIC SYSTEM PLUMBING HAD A FATIGUE HAIRLINE CRACK IN THE PRESSURE LINE LEADING FROM THE PUMP TO THE CYLINDER. THE FRACTURE WAS IN THE 90 DEGREE BEND OF THE LINE.
Flight
Event TypeAccident
Event Time17:39 EDT
Nearest AirportOakland-Pontiac (0nm N)
Runway9
Runway Length6200 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAero Commander 681
Tail NumberN10TN
Aircraft CategoryAir
DamageSubstantial
OperatorTrans Industries
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsAiresearch · TPE-331-43BL · Turboprop · 575
Seats11
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 39 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 5 kt
Visibility7 sm
CeilingOvercast 1100 ft
Temperature / Dew Point0 C / 0 C
Altimeter30.00 inHg
Observation Time17:39