DAS2100-2 - Meggitt ABS Backup Ring Seal

DAS2100-2 – Meggitt ABS Backup Ring Seal

Part Number: DAS2100-2

Manufacturer: Meggitt Aircraft Braking Systems (MABS / Parker Meggitt)

Common Synonyms: Plastic Backup Ring, Anti-Extrusion Ring, Seal Retainer

Overview Section

The DAS2100-2 is an authentic Meggitt Aircraft Braking Systems (ABS) structural backup ring, specifically designed for high-pressure hydraulic interfaces within aircraft wheel and brake assemblies. As a secondary sealing component, the DAS2100-2 is installed alongside an O-ring (typically the DAS2138 series) to prevent the primary elastomer from extruding into clearance gaps under extreme hydraulic loads.

Fabricated from high-performance Polytetrafluoroethylene (PTFE) or a similar ruggedized thermoplastic, this backup ring is engineered to withstand the intense thermal and mechanical stresses of a landing gear system. It is a critical "Safety of Flight" item that ensures braking response remains consistent by maintaining the structural integrity of the hydraulic piston seals.

Enhanced Technical Data

Advanced Engineering & Structural Application

The DAS2100-2 serves as an Anti-Extrusion Barrier. In aircraft braking systems, when hydraulic pressure is applied to the piston, the O-ring is compressed. Without a backup ring, the high pressure (often exceeding 3,000 PSI during heavy braking) would force the soft O-ring material into the microscopic gap between the piston and the housing, leading to a "nibbling" failure and eventual fluid loss.

Engineering Insight: Zero-Clearance Support

The DAS2100-2 is designed with a specific Modulus of Elasticity that allows it to slightly deform under pressure, effectively closing the "extrusion gap" to near zero. Because it is made of PTFE, it also provides a low-friction bearing surface for the O-ring, reducing wear during the rapid reciprocating movements of an antiskid system.

Compatibility with Modern Fluids

The material composition is inert, meaning it will not swell or degrade when exposed to MIL-PRF-5606, MIL-PRF-83282, or phosphate-ester fluids like Skydrol. This ensures the backup ring maintains its original dimensions throughout its multi-year service life.

Aircraft Compatibility

The DAS2100-2 is a proprietary Meggitt component found in the brake and wheel assemblies of high-performance business and regional aircraft:

• Hawker 800/800XP/850XP/900XP: Integrated into the main landing gear brake piston assemblies.

• Beechcraft Premier I/IA: Used in the primary braking modules.

• Regional Turboprops: Utilized in various Meggitt-equipped platforms for the Dash 8 and ATR series (verify per IPC).

• Meggitt Brake Assemblies: Cross-referenced in major MRO manuals for Meggitt-manufactured wheels and brakes.

The Meggitt DAS2100-2 is the definitive solution for reinforcing the hydraulic integrity of your aircraft's braking system. Engineered by the world leader in wheel and brake technology, this PTFE backup ring provides the essential support required for high-pressure O-rings. When performing a brake overhaul on a Hawker or regional airframe, utilizing genuine Meggitt DAS-series hardware is critical for ensuring compliance with the original Type Certificate and maintaining the antiskid system's responsiveness. Protect your primary seals from extrusion and extend the life of your brake pistons with the precision-engineered DAS2100-2.

Installation & Maintenance Addendum

1. Orientation: When installing in a uni-directional pressure system, the DAS2100-2 must be placed on the low-pressure side (the side opposite the fluid pressure) of the O-ring.

2. Scarf-Cut Handling: If your version is "Scarf-Cut" (split), ensure the ends overlap correctly during insertion into the gland. A gap at the split can create a local extrusion point.

3. Removal: Never reuse a DAS2100-2 that shows signs of "curling" or edge wear. Always replace the backup ring whenever the primary O-ring is serviced.