Date:	Friday 7 February 2020
Time:	15:43
Type:	Boeing 757-256 (WL)
Owner/operator:	Icelandair Flugfélag Islands
Registration:	TF-FIA
MSN:	29310/938
Year of manufacture:	2000
Engine model:	Rolls-Royce RB211-535E4
Fatalities:	Fatalities: 0 / Occupants: 166
Aircraft damage:	Unknown
Category:	Accident
Location:	Keflavík International Airport (KEF) -   Iceland
Phase:	Landing
Nature:	Passenger - Scheduled
Departure airport:	Berlin-Tegel Airport (TXL/EDDT)
Destination airport:	Keflavík International Airport (KEF/BIKF)
Investigating agency:	RNSA
Confidence Rating:	Information verified through data from accident investigation authorities

Narrative:
Icelandair flight 529, a Boeing 757-200 suffered a right-hand main landing gear collapse after landing on runway 10 at Keflavík International Airport, Iceland. There were no injuries among the 166 passengers.
The captain on the flight from Berlin Tegel Airport was the Pilot Flying (PF). The flight had been uneventful, although the flight crew was aware of unfavourable weather conditions in Keflavik with winds around 40 knots, gusting to 53-56 knots.
Flight 529 was cleared direct to NONBO by Keflavik Approach. The captain 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. When the airplane reached NONBO, it intercepted the localizer and the ILS was followed down towards runway 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 airplane was flown with the nose into the wind on final approach due to crosswind conditions. Few seconds before touchdown the airplane was de-crabbed to line up with the runway heading.
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 was observed and the right side of the airplane sunk down.
The airplane speedbrake deployed momentarily and the right engine hit the runway. The airplane then leveled off again and the nose landing gear touched the runway. 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 centered 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 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. These parts were found on the runway where the touchdown occurred.
Further investigation showed that the swivel threads were undersized 1/16 inch during an overhaul in December 2008. The SWIVEL threads were then undersized again during an overhaul in November 2019, bringing it to 1/8 inch undersize. Such an undersize was allowed but required a special 1/8 undersized nut to be fabricated and used. However, the nut on TF-FIA was found to be too large.

15:00 UTC / 15:00 local time:
BIKF 071500Z 13040G53KT 5000 -DZRA BR OVC010 07/06 Q0968

15:30 UTC / 15:30 local time:
BIKF 071530Z 13042G56KT 6000 BR OVC013 07/06 Q0967

16:00 UTC / 16:00 local time:
BIKF 071600Z 13042G55KT 8000 BR OVC013 07/06 Q0966

ruv.is
visir.is
mbl.is

Other occurrences involving this aircraft

7 April 2015	TF-FIA	Icelandair	0	Reykjavík-Keflavík International Airport (KEF)		min
Lightningstrike

photo (c) Harro Ranter / ASN; Billund Airport (BLL/EKBI); 07 May 2011

photo (c) Miklos Szabo; Keflavík International Airport (KEF/BIKF); 06 May 2017

Date/time	Contributor	Updates