Flugblogg
  • Airlines
  • Airports
  • Flight Safety
  • Helicopters
  • General aviation
  • Lifestyle
  • About Us
Flugblogg
Support Us
  • Airlines
  • Airports
  • Flight Safety
  • Helicopters
  • General aviation
  • Lifestyle
  • About Us
Icelandair's Boeing 757-200 reg. TF-FIA expreinced gear's collapse in Keflavik // Source: RNSA
  • Airlines
  • Flight Safety
  • News

RNSA: Icelandair Boeing 757-200 experienced gear collapse in Keflavik because of too big nut

  • Andrei Menshenin
  • April 6, 2020
  • 3 minute read

RNSA (ITSB) found the cause of the accident with Icelandair Boeing 757-200 reg. TF-FIA, which had happened in Keflavik airport 7 of February 2020, says the preliminary report of the investigation agency, published today. According to the report, aircraft’s right main landing gear collapsed during landing due to failure of swivel attachment to the main strut.

Aircraft TF-FIA was returning to Keflavik Airport as flight FI529 from Tegel airport, Berlin. The two last METAR during the event indicated the weather in Keflavik was as follows: wind 40-42 knots with gusts 53-56 knots, visibility 5000-6000 meters, drizzle and light rain.

The Commander briefed his intentions to land a bit further down the runway than normal (3 white and 1 red on the PAPI), to avoid turbulence on short final. The plane intercepted the localizer and the ILS was followed down towards RWY 10.  The airplane encountered considerable turbulence at 1000 feet above MSL. The autopilot was disengaged between 600 and 700 feet above MSL and the airplane was then manually flown down towards the runway.

“The flare was normal and the airplane initially touched down on its right main landing gear. Then the left main landing gear touched the runway. Almost immediately thereafter, as the nose was gradually coming down, abnormal sound [like metal fracturing] was observed and the right side of the airplane sunk down. The airplane speedbrake deployed momenteraly and the right engine hit the runway. The airplane then leveled off again and the nose landing gear touched the runway”, says the report.

According to the report, the first touchdown with right main landing gear was with 1,28G load max peak, followed by left main landing gear touchdown and spoilers deploy.

The main points of the incident when Icelandair's Boeing 757-200 reg. TF-FIA experienced gear's collapse in Keflavik // Source: RNSA
The main points of the incident when Icelandair’s Boeing 757-200 reg. TF-FIA experienced gear’s collapse in Keflavik // Source: RNSA

The airplane wobbled as it continued down the runway, on the left main landing gear and the nose landing gear only, as the PF fought to keep the airplane level and centred on the runway, utilizing the aileron and rudder controls. As the airplane speed decreased, the aerodynamics of the wings and the effectiveness of the rudder and aileron control diminished, until the PF could no longer keep the airplane wings level. The right-wing sunk down again and the right engine hit the runway again. The airplane skid on the runway until it came to stop, still on the runway but with a magnetic heading of 115°.

During the ITSB on-site investigation, it became clear that the nut used to fasten the swivel in the lug position on the main landing gear shock strut was missing along with its mating washer-splined. Visual inspection of the swivel revealed only minor damage in one location of the threads.  Visual inspection of the nut revealed only two minor damaged areas on the nut threads, 180° apart and across the threads, most likely caused by the sheared off head and threaded end section of the shank as the nut came off the swivel. This suggests that the nut came off the sviwel without the nut turning. This also suggests that the thread sizes of the swivel and the nut did not match.

Initial measurements by the ITSB after the accident has shown the Major Diameter of the swivel threads to be 1.622 inches. For 1/8 inch undersize, the Minor Diameter of the nut was required to be in the range of 1.5439 to 1.5539 inch. Initial measurements by the ITSB after the accident has shown the Minor Diameter of the nut threads to be 1.617 inches. The preliminary investigation, therefore, indicates the nut to be too large for the 1/8 inch undersized swivel threads.

Icelandair's Boeing 757-200 reg. TF-FIA experienced gear's collapse in Keflavik // Source: RNSA
Icelandair’s Boeing 757-200 reg. TF-FIA experienced gear’s collapse in Keflavik // Source: RNSA

RNSA recommended to perform check for aircraft that have received overhauled landing gears from Landing Gear Technologies, registered as TF-ISS, TF-FIA, TF-ISY and D4-CCG in Icelandair and Cabo Verde Airlines.

“If the landing gear overhaul records indicate that the parts have been undersized by Landing Gear Technologies, jack up the airplane per the Aircraft Maintenance Manual instructions, disassemble the undersized parts and measure the threaded portion of the undersized parts to verify that their sizes are mating and per the relevant Component Mainteanance Manual (CMM) for undersize parts”, says the RNSA report.

Total
0
Shares
Share 0
Tweet 0
Share 0
Related Topics
  • D4-CCG
  • Icelandair
  • Keflavik
  • RNSA
  • TF-FIA
  • TF-ISS
  • TF-ISY
Previous Article
Keflavik airport // Source: Isavia
  • Airports
  • News

Passengers in Keflavik decreased by 26% in 2019, Isavia profit dropped by 3.1 bln ISK

  • Andrei Menshenin
  • April 2, 2020
View Post
Next Article
  • Airlines
  • News

Icelandair is sending a plane to China for medical supplies

  • Andrei Menshenin
  • April 7, 2020
View Post
Read more on Flugblogg
View Post
  • Flight Safety
  • General aviation
  • News

On the thin ice: RNSA finished the investigation of Haraldur Diego’s plane crash in Þingvallavatn

  • May 6, 2024
The eruption of January 2024 close to Grindavik on Reykjanes peninsula // Source: Icelandic Coast Guard
View Post
  • Airports
  • Flight Safety
  • News

A new volcano eruption started close to Keflavik, and the area is closed for sightseeing flights

  • January 14, 2024
easyJet A320neo performing flight EZY12BV (U28843) rolled out taxiway in Keflavik // Source: Jahnusz
View Post
  • Airlines
  • Airports
  • Flight Safety
  • News

Taxiway excursion in Keflavik: easyJet A320neo slipped on the turn

  • January 14, 2024
Isavia established routes for sightseeing flights over the new eruption started near Grindavik in Iceland in December 2023 // Source: Isavia
View Post
  • Airports
  • Flight Safety
  • News

Isavia opens area over the new volcano eruption for sightseeing flights

  • December 19, 2023
Lava eruption near Grindavik in Iceland in December 2023 // Source: Almannavarnir
View Post
  • Airlines
  • Airports
  • Flight Safety
  • News

Tonight a new eruption started in Iceland: the area is closed for low flying

  • December 19, 2023
View Post
  • Airports
  • Flight Safety
  • News

The sky over the possible eruption site is now closed

  • November 12, 2023
The new volcanic eruption on Reykja­nes peninsula started on 3.August 2022 // Source: pilot Lucia
View Post
  • Airports
  • Flight Safety
  • News

Keflavik Airport at risk due to upcoming volcanic eruption

  • November 9, 2023
An example of Airbus A321XLR with Icelandair livery // Source: infiniteflight.com
View Post
  • Airlines
  • News

Icelandair buys 25 Airbus A321XLR for its fleet. Airbus A321LR will be leased before

  • April 7, 2023
Flugblogg on Facebook
Flugblogg
Subscribe to be informed

All copyrights are reserved. Partial copying of materials, video or audio is allowed only with the mentioning of the source: Flugblogg.is
With all inquiries write us to
inbox @flugblogg.is

Flugblogg
Aviation blog with reviews of Icelandic aviation trends, interviews with aviators, aviation analysts and reports on general aviation. Here you will find reviews of the flights of Icelandic airlines, planes, helicopters, routes and airports.

Input your search keywords and press Enter.