Event Details

Title:Uncommanded yaw on takeoff, Boeing 737-73V, G-EZJR
Micro summary:This Boeing 737-73V experienced an uncommanded transient yawing moment on takeoff.
Event Time:2003-04-08 at 1430 UTC
File Name:2003-04-08-UK.pdf
Publishing Agency:Aircraft Accident Investigation Board (AAIB)
Publishing Country:United Kingdom
Report number:EW/C2003/04/02
Diversion Airport:London Luton Airport, London, England
Site of event:Takeoff, Luton
Departure:London Luton Airport, London, England
Destination:Vaasa Airport, Vaasa, Finland
Airplane Type(s):Boeing 737-73V
Flight Phase:Takeoff
Type of flight:Revenue
Serious Injuries:0
Other Injuries:0
Diverted to:London Luton Airport, London, England
Executive Summary:Runway 08 was in use and whilst taxiing from the apron the pilots completed the flight control checks in accordance with company procedures. These involved the commander displacing the rudder pedals to full deflection in both directions whilst the co-pilot followed through on his own pedals, both pilots checking for full and free movement. The co-pilot then displaced the control wheel and control column in both directions, again to check for full and free movement. These control checks were completed without problem.

After an uneventful taxi to the runway the aircraft was cleared to enter, backtrack and line up onRunway 08; it was then cleared for takeoff. The take-off run was normal until the commander raised the nosewheel off the ground during rotation when the crew stated that the aircraft suddenly jolted to one side, although they could not remember which way. The aircraft rapidly became airborne and the commander continued with the departure as the aircraft appeared to be handling perfectly normally once more. Once the after take-off checks were complete, the two pilots discussed the jolt and consulted the aircraft’s checklist. However, as the aircraft was now apparently operating perfectly normally, the checklist did not contain any relevant drill for them to follow. Finally, the commander contacted the Senior Cabin Crew Member (SCCM) who informed him that from the cabin, the jolt had been sufficiently severe to lead the SCCM to believe that the aircraft was about to deviate off the runway.

Unable to find a cause for the disturbance during takeoff, but believing they had experienced some sort of uncommanded rudder event, the commander spoke with the company operations staff by radio. They in turn contacted the engineering department who advised that the aircraft should return to Luton for inspection. The aircraft was levelled at FL330 and given radar vectors to return to Luton. The commander briefed for the approach and landing and both pilots revised the immediate action items for an uncommanded rudder input in case they experienced another disturbance. The commander stated that he also added an additional 10 kt to the approach speed to give an increased margin of control. Having done this, the flight crew carried out a normal landing back at Luton and taxied to a stand where the aircraft was shut down.
Learning Keywords:Operations - Upset - Uncommanded or excessive Yaw
Close match:Uncommanded yaw on rollout, Incident, Fokker F-27, D-AELF, Billund Airport
Runway departure, Incident of aircraft, Airbus A-340 registration EC-IDF, at Madrid-Barajas Airport (Madrid) on 7 September 2002
Birdstrike on takeoff, Accident of aircraft BOEING B-737, registration PH-BTC, at Barcelona Airport (Spain), on 28 November 2004
Landing gear failure on landing, Accident of aircraft Fokker MK-100, registration I-ALPL, at Barcelona Airport (Barcelona), on 7 November 1999
Accident involving aircraft SE-DMX, 9 March 1997, Kiruna airport, BD county, Sweden
Runway excursion, Incident involving aircraft SE-DNU at Ängelholm Airport, M county, Sweden, on 15 April 2004
Yaw problems on approach, Report on the Serious Incident at Bergen Airport Flesland (ENBR) ON 24 March 2003, involving SAS329, MD-81, LN-RMO, Operated By Scandinavian Airlines
Serious Incident to MD-11 N803DE at Dublin Airport, 3 February 2002
Aircraft accident report, Mandala Airlines MDL493, Boeing B737-200 Adv PK-RIL, Hasanuddin Airport, Ujungpandang, South Sulawesi, 5 April 1999
Loss of directional control on landing, McDonnell Douglas MD-82, PK-LMM, Hassamuddin Airport, Indonesia, 31 October 2003
Nosewheel control failure, BAe 146, EI-CPJ
Uncommanded yaw, Boeing 737-81Q, G-XLAD
Directional control problems, Boeing 737-204 Advanced, EI-CJH
Ambiguous gear indications, Boeing 757-236, G-BIKW
Yaw control problems and runway overrun, Fokker F27-500, G-BNCY, Guernsey
Engine failure on takeoff, Boeing 777-200, G-VIIH, 12 March 1998 at 1900 hrs
Uncommanded yaw on climb, Airbus A300B4- 605R, N14065
Uncontrolled Collision with Terrain, Air Transport International, Douglas DC-8-63, N782AL, Kansas City International Airport, Kansas City, Missouri, February 16, 1995
Runway Departure Following Landing, American Airlines Flight 102, McDonnell Douglas DC-10-30, N139AA, Dallas/Fort Worth International Airport, Texas, April 14, 1993
Runway overrun, USAir, Inc., Boeing 737-400, Laguardia Airport, Flushing, New York, September 20, 1989
Loss of directional control, Trans World Airlines, Inc., Boeing 707-331C, N787TW, National Aviation Facilities Experimental Center, Atlantic City Airport, Pomona, New Jersey, July 26, 1969
In-flight upset, China Airlines, Boeing 747 SP, N4522V, 300 Nautical Miles Northwest Of San Francisco, California, February 19, 1985
Runway overrun, Continental Air Lines, Inc., McDonnell-Douglas DC-10-10, N68045, Los Angeles, California, March 1, 1978
Taxiway excursion in icing, Japan Air Lines Co., Ltd., Boeing 747-246, JA8122, Anchorage, Alaska December 16, 1975
Uncommanded rudder oscillation, McDonnell-Douglas DC-10-40, July 10, 1993
Uncommanded yaw damper inputs, Boeing 747-123, May 18, 1998
Uncommanded roll and yaw, Douglas DC-9-34, April 30, 1998
Stuck elevator, Airbus A320, November 24, 1996
Runway excursion, A320-232, JFK, January 21, 2001
Rudder control malfunction, Boeing 757-200ER, September 13, 1993
Rudder hardover, Boeing 747-400, October 9, 2002
Runway excursion during takeoff, Boeing 747-136, Jamaica, December 20, 1995
Runway excursion, McDonnell Douglas DC-9-82, Denver, May 28, 2005
Runway excursion, hydraulic failure, Boeing 737-200RS, Salt Lake City, September 24, 1997
Runway excursion, Boeing 737-223, Atlanta, November 1, 1998
Runway excursion, Douglas DC-8-62, Orlando, December 30, 1996
Runway excursion, McDonnell Douglas DC-9-82, Cleveland, March 5, 1997
Partial runway excursion, Boeing 737-300, Dallas, May 10, 1996
Loss of rudder control, Boeing 737-201, June 9, 1996
Flight control system oddities, McDonnell Douglas MD-82, April 11, 1998
Dual engine failure and loss of directional control, Douglas DC-9-32, Windsor Locks, December 19, 1995
Runway excursion during landing, Southwest Airlines Flight 2066, Boeing 737-300, N343SW, Amarillo, Texas, May 24, 2003


Accident Reports on DVD, Copyright © 2006 by Flight Simulation Systems, LLC.  All Rights Reserved.
 All referenced trademarks are the property of their respective owners.