Serious incident Boeing 737-3B7 N396US, Saturday 5 August 1995
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Date:Saturday 5 August 1995
Time:10:00 LT
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different    
Boeing 737-3B7
Owner/operator:USAir
Registration: N396US
MSN: 23318/1234
Year of manufacture:1986
Total airframe hrs:27857 hours
Engine model:GE CFM56-3
Fatalities:Fatalities: 0 / Occupants: 83
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:Charlotte, NC -   United States of America
Phase: Unknown
Nature:Unknown
Departure airport:Albany, NY (KALB)
Destination airport:(KCLT)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
THE CAPTAIN REPORTED THAT DURING DESCENT THROUGH 12,000 FEET WITH THE 'A' SYSTEM AUTOPILOT ENGAGED AND WITH AN AIRSPEED OF 250 KNOTS, THERE WAS AN UNCOMMANDED ROLL TO THE LEFT. HE DISENGAGED THE AUTOPILOT AND ROLLED THE THE AIRPLANE TO WINGS LEVEL FLIGHT, THEN CONTINUED THE FLIGHT WITH THE AUTOPILOT OFF. POSTINCIDENT EXAMINATION OF THE AIRCRAFT REVEALED AN INTERMITTENT ELECTRICAL CONNECTION IN AN 'A' AUTOPILOT CIRCUIT, DUE TO PIN CONNECTOR(S) BEING PUSHED OUT OF PLACE ON THE FLIGHT CONTROL COMPUTER SHELF CONNECTOR. ONE OF THE PINS WAS IN THE AILERON POSITION SENSOR EXCITATION CIRCUIT. THE 'A' FLIGHT CONTROL COMPUTER HAD BEEN REMOVED AND REINSTALLED THE DAY BEFORE THE INCIDENT TO INSPECT THE RACK FOR FLUID CONTAMINATION.

Probable Cause: IMPROPER INSTALLATION OF THE 'A' SYSTEM FLIGHT CONTROL COMPUTER BY COMPANY MAINTENANCE PERSONNEL, WHICH RESULTED IN PIN CONNECTOR(S) BEING PUSHED LOOSE AND SUBSEQUENT MALFUNCTION OF THE AUTOPILOT.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: MIA95IA194
Status: Investigation completed
Duration: 1 year 1 month
Download report: Final report

Sources:

NTSB MIA95IA194

Location

Revision history:

Date/timeContributorUpdates
14-Mar-2024 15:20 ASN Update Bot Added

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