ATL89LA121

NTSB accident investigation · Aero Commander 685 · Southern Pines, NC · April 5, 1989

Accident · Minor injuriesLimited investigationFinal report
Date
April 5, 1989, 16:00 local (20:00 UTC)
Place
Southern Pines, NC
Injuries
1 minor, 3 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N685RBAero Commander 685
Weather
Visual (VMC) · Day
Status
Completed · report August 2, 1990
Report
Approved by Office Director
FAA report
19890405006199A
Case key
8010

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's improper use of the mixture controls which resulted in engine roughness and the failure to properly execute the emergency procedure for a rough engine by placing the fuel boost pump switch in the low position.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of engine power(partial) - nonmechanicalCruise - normal
Mixture - improper use ofPilot in commandCause
Emergency procedure - improperPilot in commandCause
Fuel boost pump selector position - improper use ofPilot in commandCause
Forced landingDescent - emergency
In flight collision with objectApproach - vfr pattern - final approach
Object - tree(s)
Hard landingLanding - flare/touchdown

Analysis

The plt reported that during cruise flight an eng began running rough. He put the fuel boost pump switch in the high boost position and advanced the throttle, mixture, and prop levers to max. This resulted in a loss of pwr on both engs. The acft touched down hard short of the runway during the forced landing and collided with trees. The acft flt manual stated that the mixture must be adjusted at reduced power settings to avoid a rich mixture. The emerg procedures in the flt manual cautions that a rough running eng may be due to too rich of a mixture.

Aircraft

Registration
N685RB
Reported as
Aero Commander 685
Category
Airplane
Serial number
12059
Airframe hours
1,791
Engine
Continental GTSIO-520-K1B, 435 horsepower, reciprocating
Damage
Substantial damage
Fire
On-Ground
Flight
Business · Part 91
Registered owner
Tcr Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 19, 1989 · 21 hours before
Departed
RDU · Raleigh, NC
Destination
DNL · Augusta, GA
Flight plan
IFR
Airport
SOP · Moore County, runway 23, 5,503 × 150 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
44
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
5,000 total · 69 in this make and model · 5,000 as pilot in command · 133 in the last 90 days · 42 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
280° at 5 knots
Visibility
7 statute miles
Lowest ceiling
4,500 ft broken
Altimeter
29.00 inHg
Observed at
POB, 18 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.