Mods Catalog

Welcome to the Heli-One online modifications catalogue.

You can browse Heli-One's modifications by aircraft type, mission purpose or ATA code. Use the search function to look up modifications as well.

Within each modification listing, you can learn more about each modification's purpose, certifications, weight, and installation time. You can also email the modification to others by clicking on the EMAIL link at the bottom of each listing. You contact the Heli-One team for further information on pricing and installation by clicking the CONTACT US button at the bottom of the listing. You can also contact Heli-One directly: 1-877-243-4573 ext. 109

Modifications are loaded dynamically - scroll down to load more content.

    • S-76
    • SAR
    • LAW
    • EMS
    Loud Hailer
    -Project No. CHS76-25-076
    An essential piece of kit that provides the pilot with a system to alert ground crew of potential danger.

    Modification details

    Title Loud Hailer
    Aircraft S-76 (A/C)
    Approvals TCCA Minor
    Purpose Alerting the crew of potential danger during ground runs
    Weight of Kit 4.5kg
    Installation Time Low

    Description of modification

    The loud hailer system is an effective warning system that provides the pilot with ability to alert the ground crew of potential danger while the rotorcraft is operated on the ground. It consists of a PA controller AA21-401, power amplifier and a speaker. The control unit and amplifier are located in the avionics bay, whilst the speaker is mounted in the Main Landing Gear L/H bay area. The speaker will be activated only when the console-mounted toggle switch operates the system in “siren/yelp” mode. Both the pilot and the co-pilot can activate the switch in case of emergency. Whilst activated, the controller draws 3A of current whilst the amplifier draws 5.5A.
    • ATA: 25 Equipment / Furnishings
© 2023 Heli-One, a division of CHC Helicopter

Cookies Acceptance

We use cookies on for the purposes of gathering information on how people visit and use our website to help improve this site. Anonymous information collected and reported includes things like number of visitors, time spent on the website, and basic geographical information. None of the information gathered is identifiable information. Go HERE for additional information on cookies used on