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ASN Wikibase Occurrence # 200011
Last updated: 14 October 2021
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Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different
Boeing 737-8B6 (WL)
Owner/operator:Royal Air Maroc
Registration: CN-RNW
MSN: 33057/1347
Fatalities:Fatalities: 0 / Occupants:
Other fatalities:0
Aircraft damage: None
Location:near Lisboa -   Portugal
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Lisboa-Humberto Delgado Airport (LIS/LPPT)
Destination airport:Casablanca-Mohamed V Airport (CMN/GMMN)
One of the engines failed during climb.

Probable causes
The clogging of the filter in Engine 1, which led the crew to bring the engine to a controlled shutdown in flight, was most likely due to excessive silicone in the clogged oil filter.
This silicone, which contaminated the engine's lubricating oil, was most likely caused by the silicone:
- An infiltration of a material from outside through the filter (sand for example);
- An internal degradation of a component of the filter;
- A degradation of one of the components of the lubrication system.


Accident investigation:
Investigating agency: 
Status: Investigation completed
Download report: Final report


Photo of CN-RNW courtesy

Amsterdam - Schiphol (EHAM / AMS)
8 September 2012; (c) Bart Hoekstra

Revision history:

28-Sep-2017 16:59 harro Added
25-Jun-2020 16:34 KagurazakaHanayo Updated [Departure airport, Source, Narrative]
25-Jun-2020 16:36 harro Updated [Narrative, Accident report, ]

Corrections or additions? ... Edit this accident description