What is checked regarding the slide pack pressure gauge?

The requirement for the slide pack pressure gauge to indicate a reading in the green zone is essential for ensuring that the emergency equipment is functional and safe to use. The green zone signifies that the pressure is within an acceptable range, indicating that the slide pack is properly charged and ready for deployment.

Using emergency equipment with inadequate pressure could lead to operational failures or inefficiencies during critical situations. Thus, this reading serves as an important safety check to confirm that the equipment will perform as expected when needed. Other options may involve aspects of maintenance or visibility, but the primary concern is ensuring that the gauge shows an appropriate pressure level, which is why a reading in the green zone is critical.