Taken from ATUHM user manual:

[Emergency Cockpit Release]
In the unlikely event of internal cockpit malfunction, an Emergency Release Switch (ERS) is located on the exterior of ATUHM. A service ladder is positioned nearby for immediate access. Activating the ERS will automatically raise the cockpit canopy.

Please see Section 91.2 regarding firmware updates and forced ERS deactivation process.

Danger Zone One. Story by Midnight. Art by Tanabata Usagi.