How to Inspect and Service an Inflatable Life Jacket: 12-Point Safety Checklist

An inflatable life jacket should be checked before every use and inspected in more detail at the interval stated by its manufacturer. The essential checks are the cover, webbing, buckle, crotch straps, bladder, oral valve, CO2 cylinder, firing mechanism, pull toggle, whistle, reflective material and fitted accessories.

A routine check is not the same as a certified service. The purpose of this guide is to help owners find obvious faults, understand when a jacket must be removed from use and prepare useful information for an approved service agent—not to encourage improvised repairs to life-saving equipment.

Key facts at a glance

• Inspect an inflatable life jacket before it is worn, not only once a year.
• Follow the exact manufacturer’s manual because inflators, status indicators, cylinder sizes and repacking sequences differ.
• The cylinder must be the correct type, unpierced, secure and free from damaging corrosion.
• Automatic capsules, cartridges or bobbins must be present, unfired and within any stated replacement date.
• The bladder should hold air for the duration specified by the manufacturer; the RNLI illustrates a 24-hour owner check, while some manuals specify a different minimum.
• Never use the CO2 cylinder to test inflation unless the jacket is then correctly re-armed with the specified components.
• Do not inflate orally and then fire the cylinder: the extra gas can over-pressurise and damage the bladder.
• Salt, sand, oil, fuel, mould, sharp objects, heat and poor storage can damage a jacket that has never been deployed.
• A green indicator is useful, but it is not proof that the entire life jacket is serviceable.
• Commercial and coded use can require certified servicing and records under the applicable code.

Pre-wear check, owner inspection and professional service

Life jacket maintenance is easiest to understand as three separate layers. A pre-wear check takes less than a minute and confirms that the jacket is closed, correctly armed, undamaged and ready to put on. A more detailed owner inspection opens the cover, checks the cylinder, inflator, bladder and accessories, and may include an oral leak test if the manual permits it. A professional service follows the manufacturer’s controlled procedure, uses calibrated equipment where required and records the result.

Owners sometimes skip the first layer because a jacket has a recent service label. That is unsafe. A cylinder can work loose, a pull toggle can become trapped inside the cover, a capsule can pass its replacement date, or a buckle can be damaged after the service. Equally, a neat green status window does not reveal abrasion to the bladder or UV-damaged webbing.

The 12-point inspection checklist

Checking the CO2 cylinder

The gas cylinder is simple but critical. Confirm the gram weight and thread or connection against the jacket label and manual. A larger cylinder is not a safe upgrade: it can over-pressurise a bladder designed for less gas. A smaller cylinder may not deliver the tested buoyancy or turning performance.

Unscrew or remove the cylinder only as described by the manufacturer. Check that the sealing face is intact and that the cylinder has not been pierced. Surface marks are not all equal: light cosmetic discoloration may differ from deep corrosion around the neck or threads. If corrosion is present where the cylinder touches the bladder, replace it and examine the fabric for abrasion or chemical damage. Some manufacturers require the cylinder to be weighed during service; use the stated tolerance and suitable scales rather than guessing from feel.

When refitting, use hand force unless the manual specifically instructs otherwise. Over-tightening can damage threads or a mechanism; under-tightening can allow the cylinder to loosen. Some products use retainers or status indicators that must be reset in a particular order. The dedicated guide to life jacket CO2 cylinders and re-arming kits should always be used alongside the product manual.

Checking automatic and manual inflators

A manual jacket normally relies on the pull toggle moving a lever that pierces the cylinder. An automatic jacket adds a water-activated element, such as a soluble cartridge, capsule or bobbin. A hydrostatic system is designed to respond to water pressure and uses its own replacement unit and procedure. These systems are not interchangeable merely because they are attached to a 33g cylinder.

• Check every status window or indicator specified by the manufacturer.
• Confirm that the automatic element has not expired, fired, cracked or been exposed to moisture beyond its intended use.
• Make sure the mechanism is completely dry before fitting a new water-sensitive component.
• Verify that a manual-only jacket has the correct retaining clip or indicator reset after activation.
• Never pack loose spare capsules beside an armed inflator where moisture can affect them.
• If the mechanism has corrosion, impact damage, missing parts or conflicting indicator colours, remove the jacket from use.

The store separates automatic, manual, Hammar and Pro Sensor re-arming kits because the distinction is functional, not cosmetic.

How to carry out an oral inflation and leak check

Carry out an owner leak test only if it is included in the user instructions. Work in a clean, dry space away from sharp objects, fuel, oils and direct heat. Remove or isolate the CO2 cylinder and automatic element only in the sequence specified by the manufacturer so that the jacket cannot accidentally fire while already orally inflated.

1. Open the cover using the designed burst zip, closure or access point. Do not drag the bladder through a narrow gap.
2. Inspect both faces of the bladder, seams, oral tube and attachment points before adding air.
3. Inflate through the oral tube until the condition described by the manufacturer is reached. Do not use compressed workshop air.
4. Leave the inflated jacket in a stable dry environment for the stated period. The RNLI’s owner guidance illustrates a 24-hour test; individual manuals may specify a different period or method.
5. Compare firmness and inspect for local leakage. Temperature changes alter air pressure, so avoid moving the jacket between a hot room and a cold garage during the test.
6. If the bladder loses firmness beyond the permitted amount, do not patch it yourself. Send it to an approved service agent or replace the jacket.

Webbing, buckle, harness and crotch straps

The bladder cannot protect a wearer if the jacket rides over the head or separates from the body. Inspect the waist belt, structural stitching and buckle with the same care as the inflator. Pay particular attention to sections that rub against waterproof clothing, guardwires or the edge of a seat.

A sailing harness is load-bearing safety equipment. Check the D-ring or textile attachment, the surrounding webbing, stitching and any overload indicator. Do not assume that a metal ring on a general-purpose jacket is an approved deck harness. If clipping on is part of the plan, pair a suitable harness model with a compatible safety line and inspect both systems.

Crotch straps should be present when specified, attached to the intended points and adjusted so that they limit ride-up without preventing normal movement. A retrofit must be approved for the jacket; tying webbing around another component can damage the bladder or alter the load path.

Lights, spray hoods and locator devices

Open the cover far enough to confirm that a life jacket light is within its service or expiry date, its water sensors and lead are undamaged, and it is positioned to remain visible after inflation. Test it only by the manufacturer’s approved method; repeatedly wetting an automatic light can shorten its life or leave it damp inside the cover.

Deploy the spray hood during familiarisation. Check mesh, elastic and attachment points, then fold it exactly as directed. A hood buried beneath a bladder fold may be difficult to reach. Any PLB or AIS MOB device must be fitted with manufacturer-approved attachments so that antenna deployment, water activation and life jacket inflation do not interfere with each other.

Deflating and repacking safely

Repacking is part of the safety system. The bladder must unfold in the intended direction, the manual toggle must remain accessible, the oral tube and light must sit in their designed locations, and a spray hood must be reachable. A cover that looks tidy can still hide a twisted bladder or trapped pull cord.

Use only the cap or tool specified for the oral valve and remove all air. Dry the bladder and mechanism completely. Follow the numbered fold sequence in the manual, close the burst zip or hook-and-loop sections in the correct order and perform a final status check after the cover is closed. If the instructions are missing, do not copy the folding pattern from a different model.

After any real or accidental inflation, rinse salt and contamination as directed, determine why it deployed, inspect for damage, replace the exact fired components and consider professional servicing. The existing life jacket inflation guide explains the main inflation systems and accidental-deployment considerations.

How often should a life jacket be serviced?

There is no safe universal interval that overrides every manufacturer and use. Many leading manufacturers call for annual inspection or service, and the RNLI recommends regular owner inspection in conjunction with an annual service. Commercial, coded, hire, training and heavily used jackets can be subject to stricter schedules. The Workboat Code requires inflatable jackets to be serviced in accordance with manufacturer recommendations and at maximum annual intervals in intervening years.

Use the label, owner manual, approval requirements and service history for the exact jacket. Increase inspection frequency after salt-water immersion, heavy spray, contamination, prolonged deck use, damp storage or an impact. A jacket worn daily by a harbour worker cannot reasonably be treated like one kept clean and dry for occasional family cruising.

When to stop using the life jacket

• The bladder leaks, delaminates or has been patched without an approved repair.
• Structural webbing, harness stitching or the buckle is damaged.
• The inflator is cracked, corroded, incomplete or cannot be positively identified.
• The cylinder is wrong, pierced, deeply corroded or cannot be secured correctly.
• The product label is unreadable and correct parts or service requirements cannot be confirmed.
• Heat, fuel, oil, solvents, mould or UV exposure has materially damaged the fabric.
• The manufacturer or approved service station rejects the jacket or no longer supports essential components.
• The jacket no longer fits the intended wearer and clothing securely.

Do not move a questionable jacket into a “guest” locker. Mark it clearly and isolate it until it has been assessed, repaired by an authorised route or destroyed so it cannot return to service accidentally.

Create a simple inspection record

Record the jacket model, serial number, purchase date, inflator type, cylinder size, capsule date, service date, next service due, accessory dates and any deployment. Photograph the open jacket and status indicators after each detailed check. A record exposes repeated loose cylinders, unexplained capsule activation or accelerated wear and makes it easier to order the correct parts.

Frequently asked questions

Can I service an inflatable life jacket myself?

You can perform the pre-wear and owner checks permitted by the manufacturer. A formal service, repair, coded-vessel inspection or test requiring calibrated equipment should be handled through the approved service route.

Should I leave my life jacket inflated for 24 hours?

The RNLI illustrates a 24-hour oral test, but the exact method and minimum period in your manufacturer’s instructions take priority. Control temperature and never fire a cylinder into an orally inflated bladder.

Does a green indicator mean the life jacket is safe?

It normally confirms a particular part of the firing mechanism is in its ready state. It does not prove that the cylinder is the correct size, the bladder is leak-free, the webbing is sound or the accessories are serviceable.

Can I use a rusty CO2 cylinder?

Replace a cylinder with significant corrosion, especially around the neck, threads or where it contacts the bladder. Inspect the fabric beneath it for abrasion. Follow the manufacturer’s replacement criteria.

How often should the automatic capsule be changed?

Use the date and replacement interval specified for that exact inflator and manufacturer. Do not assume every capsule has the same service life.

Can I repack the bladder using a video for a similar model?

No. Fold direction, zip start point, accessory position and inflator routing can differ. Use the exact manual or an approved service agent.

Technical references

• RNLI — Choose It, Wear It: maintaining your life jacket
• RYA — Life jacket safety guidance
• Baltic — Important information about inflatable lifejackets
• Crewsaver — Crewfit 180N Pro user manual
• MCA — Workboat Code Edition 3