Aviation Seat Belts and Lap Belts

Tulmar Safety Systems is the only approved Amsafe Aviation Repair Station in Canada.

Tulmar is located in Hawkesbury, Ontario.
7/24 AOG services.



Tulmar is a Transport Canada Approved Maintenance Organization operating under an AMO 67-92 and holds an EASA Part 145 approval under EASA 145.7249.

The foregoing is addressed to all Aviation sectors located in Canada and/or for work performed in Canada.

It is a known fact that the aftermarket service demand is rapidly increasing for the re-certification of both Amsafe harnesses, lap belts and extensions. As a result, many comments and questions have come our way and below are answers to the most common ones.

Belt Repairs
Seat belt
Belt Parts
Rotary Buckle
Can I clean my lap belt myself or do I have to send it to Tulmar?

As per Amsafe’s work instructions, Tulmar does not clean seat belts. However, if you opt to clean your belts, you may download Amsafe’s instructions below.


Yes, lap belts can be dry-clean using the proper procedure. Restraint Systems containing an inertia reel or rotary buckle MUST NOT BE dry clean.

How much fraying is allowed before I need to send my belt to Tulmar?

You may download these guidelines to help you determine if you need to send your belt to Tulmar.

Is the webbing showing signs of wear? What are the parameters of acceptable webbing wear?

Slight wear of the webbing is permitted. However, excessive web wear that as progressed to cut or worn edges must be replaced, as described below.

Examine webbing for signs of the following:

  • Cut or worn edges
  • Damaged stitching
  • Broken fabric threads
  • Tearing
  • Excessive chafe marks
  • Excessive wear
  • Excessive fusing

Replace webbing if any of the following are observed:

  • A limited amount of “frayed” webbing will retain sufficient strength necessary to meet the required strength. Frayed webbing is defined as broken filaments from either the warp (longitudinal) yarns or the filler (transverse) yarns. The number of broken filaments should not be sufficient to obscure the identity of any yarn when viewed from a distance of about 8 inches.
  • Any web that is cut or torn on the edge should be replaced. The amount of fray should be limited to an amount that is less tan 10% of the width of the webbing and not to exceed 8 inches in length.
  • Webbing with more than 15 broken yarns in locations other than the edge.
  • Webbing that is frayed or distorted sufficiently to cause improper operation of any portion of the restraint system.
  • A total of 15 stitches can be torn in a stitch pattern before the webbing needs replacement.
Can I change the color of the webbing, the hardware or the length on my existing belt?

Unless this request is handled by an Authorized Repair Station or Amsafe directly, the answer is No. Tulmar can provide assistance with these types of requests.

By sending your requests to Tulmar, you are ensured that any and all changes are in compliance with the OEM / Amsafe drawing.

NOTE: Any change that is not approved / reflected on an Amsafe Drawing automatically renders your belt Non-Compliant; thus, a Certificate of Airworthiness (Form 1) cannot be issued.

Can I install a belt on any seat if the hardware fits?

The answer is No. A belt is tested and certified on specific types of seats. Some seats are dynamically tested, some are not. Only the seat manufacturer or Amsafe can validate the use of an alternate belt on a specific seat. Depending on the situation, a letter of similarity from Amsafe may be required.

Something is not working right with the reel or the rotary buckle, can I open it and fix it?

The answer is No. Your belt should be sent to Tulmar for repair. Any attempt to repair the mechanism yourself or have it repaired by an unauthorized repair station will void the warranty from Amsafe.

What happens if my belt is repaired by an unauthorized repair station? Is the Amsafe warranty still valid?

A belt repaired / re-certified by an unauthorized Amsafe repair station will carry NO Amsafe warranty.

Why should I send my belt to Tulmar?

Transport Canada and the FAA operate under a bi-lateral agreement. To this end, please refer you to an INFO letter 17004 published by the FAA in February 28/2017 – Seat Belt Repairs and Alterations.

Special attention should be given to the following statement contained therewith:

In order for the aircraft to remain airworthy, the seat assembly installed must, per § 43.13, have been maintained (installation of a replacement seat belt) in such a way as to make it at least equal to its original condition. In this case the seat belt can be either a new seat belt properly identified by the manufacturer as being eligible for installation or it can be a repaired seat belt. However, if a repaired seat belt is used, it must have been repaired in such a way that assures that the performance of the seat assembly still meets the regulatory requirements of part 43. Proper repair can’t be established by simply substantiating that the repaired belt meets the same TSO as the original belt.


Repairs to aviation seat belts will typically be considered major repairs and will therefore require Federal Aviation Administration (FAA) approved data for the repair process. The FAA is in the process of carefully reviewing existing approved repair data, such as repair specifications, as well as carefully scrutinizing any newly submitted repair data for appropriateness and conformity to the required performance criteria.


Some reweb can still be performed on TSO C22f belts although they are no longer available for purchase new and some can no longer be re-webbed or purchased.
PLEASE CONTACT TULMAR IMMEDIATELY IF YOU HAVE BELTS that are TSO C22f installed on your aircraft so we can provide assistance aviation@tulmar.com
*Belts TSO C22f cannot be re-webbed to TSO C22g.

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