Supplemental Inflatable Restraint (SIR) Disabling & Enabling Zones (Ascender)
On Ascender, the Supplemental Inflatable Restraint (SIR) system has been divided into disabling and enabling zones. When performing service on or near SIR components or SIR wiring, it may be necessary to disable the SIR components in that zone. It may be necessary to disable more than one zone depending on the location of other SIR components and the area being serviced. See Fig 1. Identify the specific zone or zones in which service will be performed and disable and enable selected zone or zones.