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ASN Wikibase Occurrence # 160055
Last updated: 19 November 2018
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Date:30-AUG-2013
Time:21:10
Type:Silhouette image of generic MD11 model; specific model in this crash may look slightly different
McDonnell Douglas MD-11F
Owner/operator:Martinair Holland N.V.
Registration: PH-MCW
C/n / msn: 48788
Fatalities:Fatalities: 0 / Occupants:
Aircraft damage: Minor
Category:Incident
Location:Aguadilla-Borinquen Airport (BQN/TJBQ) -   Puerto Rico
Phase: Take off
Nature:Cargo
Departure airport:Aguadilla, PR (BQN)
Destination airport:London, FN (STN)
Investigating agency: NTSB
Narrative:


Four LPT stage 4 (S4) vane clusters weakened by an undetected sulfidation/corrosion attack disengaged at their inner attachment. The disengaged clusters displaced aft and contacted the S4 blades during operation. The contact machined a groove into the blade leading edges near the platforms. High cycle fatigue cracks initiating in the machined area of several blades propagated to overload separation. The blade liberation led to the separation of the remaining S4 blades and extensive downstream LPT blade and vane cluster damage. A large amount of metal debris was released into the gas path, loading the engine casings. The P-flange attachment hardware separated in overload, resulting in engine uncontainment.
Probable Cause: an insufficiently robust flange attachment hardware design, which failed to contain engine components that were liberated during an LPT mechanical failure, resulting in engine/nacelle uncontainment.

A factor in the incident was the lack of a module-level LPT inspection and the lack of an inspection requirement to detect/monitor the LPT S4 for advanced sulfidation attack.


Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20130904X10408&key=1


Revision history:

Date/timeContributorUpdates
04-Sep-2013 17:09 harro Added
04-Sep-2013 17:10 harro Updated [Source]
18-May-2016 19:18 harro Updated [Source, Narrative]
29-Nov-2017 12:13 ASN Update Bot Updated [Time, Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Damage, Narrative]

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