Accident Beechcraft 99 Airliner N844NS, Sunday 6 July 1969
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Date:Sunday 6 July 1969
Time:21:22
Type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different    
Beechcraft 99 Airliner
Owner/operator:Air South
Registration: N844NS
MSN: U- 16
Year of manufacture:1968
Total airframe hrs:2226 hours
Engine model:Pratt & Whitney Canada PT6A-20
Fatalities:Fatalities: 14 / Occupants: 14
Other fatalities:0
Aircraft damage: Destroyed, written off
Category:Accident
Location:10 km NW of Monroe, GA -   United States of America
Phase: Unknown
Nature:Passenger - Scheduled
Departure airport:Atlanta Municipal Airport, GA (ATL/KATL)
Destination airport:Greenville-Spartanburg Airport, SC (GSP/KGSP)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
Air South Flight 168 departed Atlanta at 21:07. At 21:13 the flight reported level at its assigned cruising altitude of 7,000 feet. The Beech had been cruising for eleven minutes when it attained a gradual nose down attitude due to a change in the longitudinal trim. The pilots noticed the change after about six seconds and initiated a recovery action. The horizontal stabilizer continued to move to a full nose down position. Excessive pulling force on the control column was necessary to recover from the high speed dive. The necessary stick forces for such an out-of-trim condition can exceed the capability of one pilot, and in
some cases two pilots, to control. The Beech continued to descend until both wings failed at high speed, just before the airplane crashed into the ground in a near vertical attitude.

PROBABLE CAUSE: "An unwanted change in longitudinal trim which resulted in a nosedown high-speed flight condition that was beyond the physical capability of the pilots to overcome. The initiating element in the accident sequence could not be specifically determined. However, the design of the aircraft flight control system was conducive to malfunctions which, if undetected by the crew, could lead to a loss of control."

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: DCA70A0001
Status: Investigation completed
Duration: 1 year and 4 months
Download report: Final report

Sources:


Statistics

  • 47th worst accident in 1969
  • 4th worst accident of this aircraft type
  • worst accident of this aircraft type at the time

Location

Revision history:

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