What is the first step in the emergency procedure if a parachutist's main chute fails to deploy?

In an emergency situation where a parachutist's main chute fails to deploy, the first step of checking altitude is crucial. This action allows the jumper to assess their current situation and determine how much time is available for subsequent actions. Altitude awareness is essential for decision-making; it informs whether there is enough altitude to safely execute a cutaway and deploy the reserve chute.

By confirming the altitude, the parachutist can make informed choices about their options, including whether there is time to cut away from the malfunctioning main chute or if they need to proceed directly to deploying the reserve parachute. Establishing their altitude also helps ensure that the emergency procedures are executed within safe parameters, maximizing the chances of a successful outcome. As such, altitude awareness serves as the foundation for any further steps in emergency procedures.