Updated the verbiage throughout, including to service sealed pull pins annually.
Added the pull pin overhaul and pull pin sleeve sections.
Updated layout.
Updated the cross references to the torque specs due to the splitting of APNDX into three separate modules.
Added the new note and important icons throughout the module. Added QR code to the instructional YouTube video and updated the, "Exploded view of the sealed pull pin" in section 1.2.3 Sealed Pull Pin Overhaul. Updated steps 2 in section 1.2.3.1 Preparation and the note in section 1.2.3.3 Reassembly and Filling.
Added section under 1.1 Chin Strap.
Updated layout.
Icons throughout have been updated. The 3/8" Nut Driver tool has been added to the list of required tools in section 1.2.3 Sealed Pull Pin Overhaul.
Updated the image in step seven, revised note in step five, and revised step eight in section 1.2.3.3 Reassembly and Filling.
Revision Change: 251114001 → 260225002
Old Version: Document #251114001
New Version: Document #260225002
Footer and date updates excluded.
1. Scope of Revision
This revision introduces:
* Stainless steel bottom ring–specific procedures
* Material-specific installation instructions
* Expanded Swing Catch procedures
* Clarified cam angle geometry
* Updated tool requirements and thread locker guidance
* Structural renumbering of sections
There are no functional design changes to components.
2. Chin Strap Section Changes
Tool Requirements Updated
Old:
* Phillips Screwdriver
* Plastic Syringe for RTV
New:
* #2 Phillips Screwdriver
* Torque Screwdriver with #2 Phillips attachment
* DOWSIL™ 732 Silicone Sealant or equivalent
The syringe requirement was removed. A torque tool requirement was added for consistency and compliance.
3. Sealed Pull Pins – Structural Changes
3.1 Stainless Steel Bottom Ring Support Added
New Sections:
* 1.2.2 Removal Of Sealed Pull Pins On A Stainless Steel Bottom Ring
* 1.2.4 Installation Of Sealed Pull Pins On A Stainless Steel Bottom Ring
New content includes:
* Lock nut handling instructions
* Clarification that screws are not threaded into stainless rings
* Clarification that thread locker is not required in certain stainless configurations
* Helmet orientation guidance during removal and installation
The document now supports both brass/chromed brass and stainless steel bottom rings.
3.2 Replacement Procedure Split by Material
Old Structure:
* Single replacement section
New Structure:
* 1.2.3 Replacement on Brass/Chromed Brass Bottom Rings
* 1.2.4 Installation on Stainless Steel Bottom Ring
Material-specific instructions reduce cross-material installation errors.
3.3 Cam Angle Clarification
Old Instruction:
* “Align angle towards bottom of the helmet neck ring.”
New Instruction:
* Tip of plunger is highest point
* Shortest part of slant is lowest point of bottom ring
This provides clearer alignment guidance.
3.4 Thread Locker Guidance Clarified
New version specifies:
* “Loctite® 248 or equivalent medium strength thread locker”
* Conditional application depending on bottom ring material
* Explicit instruction in the Swing Catch section to apply thread locker after passing through spacers and washers
3.5 Overhaul Section Adjustments
Updates include:
* Clarified plunger replacement condition
* Added instruction that if the red O-ring remains visible after reassembly, the knob key may be worn and the knob must be replaced
* Added material-specific thread locker guidance during pull pin reinstallation
4. Pull Pin Sleeve Section Changes
Updates include:
* Added material-specific Loctite requirement
* Tool list updated
* Section renumbered (1.2.4 → 1.2.6)
5. Swing Catch – Expanded Procedures
5.1 New Sections Added
* 1.3.2 Removal of the Swing Catch Assembly on Stainless Steel Bottom Rings
* 1.3.4 Installation of the Swing Catch Assembly on Stainless Steel Bottom Rings
Previously only a single general procedure existed.
5.2 Tool List Expanded
Now includes:
* #2 Phillips Screwdriver
* Flat Blade Screwdriver
5.3 Thread Locker Requirement Strengthened
New version instructs:
* Apply Loctite® 248 to ALL screws
* Apply thread locker after screws pass through washers and spacers to prevent fouling
5.4 Helpful Hint Section Added
New advisory guidance includes:
* Recommendation to remove regulator and exhaust system
* Suggestion to orient helmet on its side during service
6. Structural Changes
* Section renumbering due to stainless steel procedures
* Expanded table of contents
* Improved formatting and clarity of material-specific instructions
7. Operational Impact Summary
Field service procedure clarity improved.
Component compatibility expanded to include stainless steel bottom rings.
Installation error risk reduced through clearer material-specific instructions.
No mechanical design changes.
No change to maintenance intervals.
