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Continued Airworthiness Notification to the International Community
To: Civil Aviation Authorities Date: March 11, 2019
From: Federal Aviation Administration
Aircraft Certification Service
System Oversight Division, AIR-800
2200 South 216th Street
Des Moines, WA 98198
Subject: This message provides information regarding FAA continued operational safety activity related to
the Boeing 737-8 and Boeing 737-9 (737 MAX) fleet.
Situation description: Following the accident of an Ethiopian Airlines Boeing Model 737-8 airplane on
March 10, 2019, the National Transportation Safety Board (NTSB) as the accredited representative, and the
FAA as Technical Advisors, are supporting the Ethiopian Accident Investigation Bureau. The FAA has
dispatched personnel to support the investigative authorities in determining the circumstances of this event.
All data will be closely examined during this investigation, and the FAA will take appropriate action if the
data indicates the need to do so.
External reports are drawing similarities between this accident and the Lion Air Flight 610 accident on
October 29, 2018. However, this investigation has just begun and to date we have not been provided data to
draw any conclusions or take any actions.
Following the Lion Air Flight 610 accident, the FAA has completed these activities in support of continued
operational safety of the fleet:
- Issued FAA emergency Airworthiness Directive (AD) 2018-23-51 on November 7, 2018
- Validated that airplane maintenance and functional check instructions on Angle of Attack (AOA)
vane replacement were adequate
- Conducted simulator sessions to verify the Operational Procedures called out in FAA AD 2018-23-
51
- Validated AOA vane bench check calibration procedures were adequate
- Reviewed Boeing’s production processes related to the AOA vane and Maneuvering Characteristics
Augmentation System (MCAS)
Ongoing oversight activities by the FAA include:
- Boeing’s completion of the flight control system enhancements, which provide reduced reliance on
procedures associated with required pilot memory items. The FAA anticipates mandating these
design changes by AD no later than April 2019.
-
Design changes include:
MCAS Activation Enhancements
MCAS AOA Signal Enhancements
MCAS Maximum Command Limit