ASN logo
ASN Wikibase Occurrence # 217216
Last updated: 16 March 2020
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:27-APR-1995
Time:17:35
Type:Silhouette image of generic A320 model; specific model in this crash may look slightly different
Airbus A320-211
Owner/operator:Northwest Airlines
Registration: N331NW
C/n / msn: 318
Fatalities:Fatalities: 0 / Occupants: 108
Other fatalities:0
Aircraft damage: None
Category:Incident
Location:Washington, DC -   United States of America
Phase: Approach
Nature:Domestic Scheduled Passenger
Departure airport:Minneapolis, MN (MSP)
Destination airport:
Investigating agency: NTSB
Narrative:
THE PILOT REPORTED THAT DURING THE VISUAL APPROACH TO RUNWAY 18, THE AIRPLANE ENTERED UNCOMMANDED ROLLS. A GO-AROUND WAS PERFORMED. ACCORDING TO THE PILOT, ON THE SECOND APPROACH THE AIRPLANE ONCE AGAIN EXPERIENCED AN UNCOMMANDED ROLL. THE AIRPLANE WAS LANDED. FDR DATA SHOWS THE ROLL OSCILLATIONS WITH A MAX ROLL OF 15.5 DEGREES. DURING THIS TIME THE SIDE STICK WAS BEING MOVED BACK AND FORTH TO ITS FULL TRAVEL LIMITS. THE AIRPLANE MOVEMENTS AND THE PILOT'S ACTIONS ARE CONSISTENT WITH PILOT INDUCED OSCILLATIONS (PIO). THE AIRPLANE WAS BEING LANDED IN CONF 3 (20 DEGREES OF FLAPS) WHICH MAKES THE HANDLING CHARACTERISTICS OF THE AIRPLANE 'MORE CRISP'. IN 1993 AIRBUS PUBLISHED A TEMPORARY REVISION TO THE AIRPLANE'S FLIGHT CREW OPERATING MANUAL STATING THE AIRPLANE SHOULD NOT BE LANDED IN ADVERSE WEATHER CONDITIONS (GUSTY WINDS AND TURBULENCE) IN CONF 3 DUE TO THE POSSIBILITY OF PIO. NORTHWEST AIRLINES HAD NOT INCORPORATED THIS INFORMATION IN THEIR OPERATING MANUALS.

Probable Cause: the pilot's excessive use of the flight controls during the landing approach, the company's disregard of information provided by the airplane manufacturer, and the company's failure to identify a potentially hazardous conditions based on the information provided by the airplane manufacturer. Factors associated with the incident were the gusty wind conditions and the pilot's failure to land with full flaps.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001207X03253&key=1

Safety recommendations:

Safety recommendation A-95-107 issued 14 November 1995 by NTSB to FAA
Safety recommendation A-95-108 issued 14 November 1995 by NTSB to FAA
Safety recommendation A-95-109 issued 14 November 1995 by NTSB to FAA

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
03-Nov-2018 20:56 ASN Update Bot Added

Corrections or additions? ... Edit this accident description