July 26, 2018

Safety Concern with Moog Inc. Servovalves (Series 743)

  • Type of Notification: Product Safety Notification
  • FM Approval Status: FM Approved

FM Approvals has been notified by Moog Inc. of a potential defect involving FM Approved Series 743 Servovalves manufactured from January through April, 2018.


Company Identity: Moog Inc.

Name: Moog Inc.

Address:  Seneca & Jamison Road, East Aurora, New York 14052, USA

Contact Information:  Moog Inc., Industrial Group, Attn: Lee Plug Recall, 300 Jamison Road, Building 11D, Elma NY 14059


Product Identity: 743 Series Servovalve

Description: Electro-hydraulic Servovalve

Make/Model: 743xxxxx Servovalve

Nameplate Data: -743xxxxx Model, Dated between JAN-2018 and APR-2018


FM Approval Status:  FM Approved for Unclassified locations (i.e. General Safety only)


Hazard Involved: The products contain a potential latent defect due to the improper installation of Lee Plugs® into the valve body. See attached Technical Service Bulletin, issued by Moog Industrial Group.  Although testing conducted by the manufacturer indicates no immediate safety concern, the affected product should be returned to Moog Industrial Group for replacement. See attached Lee Plug Recall RGA Form.

Using This Product?

If you suspect you are in possession of affected equipment bearing the FM Approvals certification marking, please bring that to the attention of:

Antonio Pires

Norwood, MA, United States

+1 (1) 781-255-4825