ASN Wikibase Occurrence # 359075
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Date: | Friday 28 April 1995 |
Time: | 12:00 LT |
Type: | Airbus A320-211 |
Owner/operator: | Northwest Airlines |
Registration: | N331NW |
MSN: | 318 |
Year of manufacture: | 1992 |
Engine model: | GE CFM-56-5 |
Fatalities: | Fatalities: 0 / Occupants: 90 |
Aircraft damage: | None |
Category: | Serious incident |
Location: | Minneapolis, MN -
United States of America
|
Phase: | En route |
Nature: | Unknown |
Departure airport: | , MN (KMSP) |
Destination airport: | Orange County, CA |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:ON TWO CONSECUTIVE DAYS, THE SAME AIRPLANE EXPERIENCED UNCOMMANDED ROLLS DURING FLIGHT WITH THE AUTOPILOT ENGAGED. INSPECTION OF THE AIRPLANE SYSTEMS REVEALED A DEFECT IN A ROLL POTENTIOMETER LOCATED IN THE CAPTAINS SIDESTICK TRANSDUCER UNIT. A GREASE FILLED GROOVE WAS FOUND IN THE POTENTIOMETER TRACK NEAR THE NEUTRAL POSITION. THIS POTENTIOMETER SENDS ELECTRONIC SIGNALS TO THE ELEVATOR AILERON CONTROLLER (ELAC-1). THE GROOVE RESULTED IN AN INTERMITTENT LOSS OF CONTACT BETWEEN THE WIPER AND THE TRACK AND SUBSEQUENTLY A 'VOLTAGE SPIKE' TO THE ELAC-1. FOLLOWING THIS INCIDENT AIRBUS ISSUED TWO SERVICE BULLETINS ADDRESSING THE 'VOLTAGE SPIKE' PHENOMENON WHICH HAS BEEN OCCURRING ON OTHER A320 AIRPLANES SINCE 1991.
Probable Cause: inadequate design of the fly-by-wire flight control system which allowed false signals from the sidestick transducer units to generate uncommanded rolls.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | CHI95IA342 |
Status: | Investigation completed |
Duration: | 1 year |
Download report: | Final report |
|
Sources:
NTSB CHI95IA342
History of this aircraft
Other occurrences involving this aircraft
27 April 1995 |
N331NW |
Northwest Airlines |
0 |
Washington, DC |
|
non |
20 October 2007 |
N331NW |
Northwest Airlines |
0 |
Fargo, ND |
|
min |
10 November 2011 |
N331NW |
Delta Air Lines |
0 |
near Minneapolis-St. Paul International Airport, MN (MSP) |
|
sub |
1 April 2018 |
N331NW |
Delta Air Lines |
0 |
Nassau-Lynden Pindling International Airport (NAS/MYNN) |
|
non |
Location
Revision history:
Date/time | Contributor | Updates |
15-Mar-2024 06:45 |
ASN Update Bot |
Added |
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