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ASN Wikibase Occurrence # 198603
Last updated: 26 November 2021
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Type:Silhouette image of generic B744 model; specific model in this crash may look slightly different
Boeing 747-47UF
Owner/operator:Atlas Air Inc
Registration: N498MC
MSN: 29259/1227
Fatalities:Fatalities: 0 / Occupants: 3
Aircraft damage: Substantial
Location:Miami, FL -   United States of America
Phase: Unknown
Departure airport:Rio de Janeiro, FN (SBGL)
Destination airport:Miami, FL (MIA)
Investigating agency: NTSB
On May 17, 2010, an Atlas Air Cargo Boeing 747-400F, N498MC, lost a section of the left fore-flap while on approach to Miami International Airport (KMIA), Miami, Florida. The airplane was substantially damaged when the flap portion impacted the fuselage. There were no injuries to the flight crew and the airplane landed without further incident. The cargo flight originated from Rio de Janeiro-Galećo-Antonio Carlos Jobim International Airport (BGL), Rio de Janeiro, Brazil.

According to the operator, the flight crew heard and felt a large impact after 30 degree flaps was selected during the approach. Postflight inspection revealed that approximately twelve feet of the right wing inboard fore flap was missing and had caused substantial damage to the aft fuselage.

The separated section of the fore flap was recovered and examined. The examination revealed that a large portion of the enamel was missing from the fore flap attachment fitting of the carriage assembly and that there was a large amount of contamination and grease buildup around the lubrication fitting. Extensive corrosion byproducts covered up the lubrication passage in the attachment, which prevented passage of grease to the bearing, causing extensive corrosion in the bore and propagated by fatigue before final ductile separation.
Probable Cause: impact of the fore flap with the aft fuselage after fatigue failure of the right wing fore flap carriage assembly attachment fitting at position 6.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 6 years and 8 months
Download report: Final report


Photo of N498MC courtesy

Amsterdam - Schiphol (EHAM / AMS)
7 January 2021; (c) Gerard Helmer

Revision history:

19-Aug-2017 09:44 ASN Update Bot Added

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