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ASN Wikibase Occurrence # 190039
Last updated: 7 August 2020
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Date:14-SEP-2016
Time:14:16 LT
Type:Silhouette image of generic F100 model; specific model in this crash may look slightly different
Fokker 100
Owner/operator:Iran Air
Registration: EP-CFP
C/n / msn: 11409
Fatalities:Fatalities: 0 / Occupants: 115
Other fatalities:0
Aircraft damage: Substantial
Category:Serious incident
Location:Tehran-Mehrabad Airport (THR/OIII) -   Iran
Phase: Taxi
Nature:Passenger - Scheduled
Departure airport:Tehran-Mehrabad Airport (THR/OIII)
Destination airport:Birjand Airport (XBJ/OIMB)
Narrative:
Iran Air flight IR212, a Fokker 100, suffered a collapse of the nose landing gear at Tehran-Mehrabad Airport. The incident happened on the eastern platform.
The nose gear collapsed rearward and sideways, causing the wheels to become partially embedded in the fuselage below the R1 door.

3.2 Causes:
3.2.1 Main Causes:
The event initiated by fatigue cracking in the main fitting of Nose landing gear.
The lower section of the main fitting showed multiple crack initiation points on the fracture surface; the fractured upper spigot section of the turning tube was visible inside the main fitting. The analyses shown there were cracks in the NLG main fitting and the turning tube which propagated at the same time but independently of one another.
Prior to the initiation of MF fatigue cracks: an operation or events outside of the certification envelope of the MF must have occurred for a fatigue crack to initiate at this section.
Regarding the Turning Tube; a malformed radius originating from a repair of the turning tube led to a double radius feature, locally increasing the stress which resulted in fatigue crack initiation.
The most probable sequence of events is that the main fitting fractured first, causing the collapse of the leg. Base on SAFRAN Landing Systems report TE-GL-00159023 the fracture of main fitting (fatigue crack initiation) was occurred during the life of the component.
3.2.2 Contributory Factors:
Lack of preventative inspection task as Single visual inspection of AMM for rough towing to detect failure is found.
Maintenance process of nose landing gear was not effective to prevent incident.

Sources:

Twitter
https://www.cao.ir/web/english/investigation-reports?p_p_id=NetFormGetFile_WAR_NetForm&p_p_lifecycle=2&p_p_resource_id=getFile&_NetFormGetFile_WAR_NetForm_file=ZTliajVaZmlpbWZNZGE3OTc5TGNMNTVCQXZKSzl2RGtZVlBDNnVFV0d2enM4R1QreFRaYWZrNkNjNDczeDZnQStXOHRFcjlGVDdhYQppemRldWVxUytRPT0=.pdf


Images:


Revision history:

Date/timeContributorUpdates
14-Sep-2016 12:42 harro Added
14-Sep-2016 12:47 harro Updated [Time, Embed code, Narrative]
14-Sep-2016 16:01 Anon. Updated [Phase, Damage, Photo, ]
02-Jun-2017 17:05 harro Updated [Location]
25-May-2020 17:50 KagurazakaHanayo Updated [Time, Total occupants, Destination airport, Source, Narrative]

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