🔍 Key Concepts

• 46 CFR Subchapter W lifesaving appliance maintenance requirements • Labeling and expiration dates on PFD (personal flotation device) lights • Difference between power source life (battery) and device life (light unit itself)

💭 Think About

• Look at which choice depends on the manufacturer’s specifications and markings on the equipment rather than a fixed calendar interval chosen by the crew • Ask yourself: does the Coast Guard usually require replacement of equipment like lights based on time in service, on battery change, or on marked service life? • Consider how an inspector would quickly verify if a PFD light is still acceptable just by looking at it

✅ Before You Answer

• Check what is printed on actual USCG‑approved PFD lights about replacement or service life • Verify in current 46 CFR if replacement is tied to battery replacement or to the marked service/expiration date on the light • Make sure you distinguish between inspections (done frequently) and mandatory replacement (done at a specific interval or date)