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En Route Minimum Safe Altitude Warning (e‐Msaw)

JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov

When an E‐MSAW alert is displayed, immediately analyze the situation and take the appropriate action to resolve the alert.
Note

Caution should be exercised when issuing a clearance to an aircraft in reaction to an E‐MSAW alert to ensure that adjacent MIA areas are not a factor.

Reference

FAA Order JO 7110.65, Para 2-1-6, Safety Alert.
The controller may suppress the display of an E‐MSAW alert from his/her control position with the application of one of the following suppress/inhibit computer functions:
1. The specific alert suppression message may be used to inhibit the E‐MSAW alerting display on a single flight for a specific alert.
2. The indefinite alert suppression message must be used exclusively to inhibit the display of E‐MSAW alerts on aircraft known to be flying at an altitude that will activate the alert feature of one or more MIA areas within an ARTCC.
  Note
  1. The indefinite alert suppression message will remain in effect for the duration of the referenced flight's active status within the ARTCC unless modified by controller action.
  2. The indefinite alert suppression message would typically apply to military flights with clearance to fly low‐level type routes that routinely require altitudes below established minimum IFR altitudes.
The computer entry of a message suppressing or inhibiting E‐MSAW alerts constitutes acknowledgment for the alert and indicates that appropriate action has or will be taken to resolve the situation.