When giving first aid to an accident victim where a spinal injury is suspected or possible?

Not entirely sure what you're asking but since I'm an EMT I'll try to answer it anyway.

When a spinal injury is possible do NOT perform a head-tilt/chin-lift or use a nasopharyngeal airway to open the patient's airway. Do NOT put them in a recovery position as it can result in irreversible damage. DO use an oropharyngeal airway and/or the jaw-thrust maneuver while keeping them in the Supine position to open the airway and take spinal precautions to minimize the risk of further spinal damage.