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100-902-1911 – Textron Aviation OEM Preformed O-Ring
Part Number: 100-902-1911
Manufacturer: Textron Aviation (Hawker Beechcraft)
Common Synonyms: Preformed Packing, Static Seal, Hydraulic O-Ring
Overview Section
The 100-902-1911 is a high-performance OEM Preformed O-Ring engineered for critical sealing applications within the Hawker 800/900 and Beechcraft King Air series. As a "preformed" packing, this component is manufactured to strict dimensional tolerances to ensure a precise "squeeze" within its designated gland, providing a leak-proof barrier even under high-pressure and high-temperature conditions.
This O-ring is typically composed of a Fluorocarbon (Viton) or Nitrile (NBR) elastomer, depending on its specific application in either fuel, hydraulic, or environmental systems. It is designed to resist volumetric swelling and degradation when exposed to aggressive aviation fluids, including MIL-PRF-5606 and Skydrol.
Enhanced Technical Data
| Technical Metric | Specification Data |
| Material Compound | Fluorocarbon (Viton/FKM) or High-Nitrile (NBR) |
| Hardness (Durometer) | 75–85 Shore A |
| Inside Diameter (ID) | 0.614 in (Nominal) |
| Cross-Section (CS) | 0.070 in (Nominal) |
| Standard Compliance | MS28775 or AS568 Equivalent |
| Operating Temperature | $-40°F$ to $+400°F$ ($-40°C$ to $+204°C$) |
| Maximum Shelf Life | 2,555 Days (84 Months) from Cure Date |
| Fluid Resistance | Jet A-1, Skydrol, Engine Oils, and Hydraulic Fluids |
Advanced Engineering & Structural Application
The 100-902-1911 is designed for Static and Reciprocating Seals. In the Hawker 800XP landing gear or hydraulic manifolds, O-rings must maintain their sealing force despite "cold-soak" conditions at high altitudes and the intense heat generated during landing gear deployment.
Engineering Insight: The "Preformed" Advantage
The term "Preformed" indicates that the seal is molded under specific heat and pressure to eliminate internal stresses. This prevents the O-ring from "spiraling" or twisting within the groove during installation or operation. The 100-902-1911 features a high Compression Set Resistance, ensuring that after thousands of flight hours, the elastomer returns to its original shape rather than becoming permanently flattened, which is the leading cause of "weeping" leaks in pressurized systems.
Aircraft Compatibility
The 100-902-1911 is a vital maintenance component for the following airframes:
Hawker 800/800XP/850XP/900XP: Extensively used in the landing gear hydraulic actuators and brake manifold interfaces.
Beechcraft King Air 200/300 Series: Found in fuel system fittings and engine-driven pump seals.
Beechcraft Premier I/IA: Integrated into various environmental control system (ECS) valves.
The Textron Aviation 100-902-1911 is an essential component for any Hawker or King Air operator’s fly-away kit. Engineering reliability in high-pressure hydraulic systems starts with the integrity of the seals. This OEM preformed O-ring provides the chemical resistance and thermal stability required for the most demanding flight profiles. By choosing genuine Textron hardware, you ensure that the elastomer compound meets the exact durometer and swell-rate specifications required by the Aircraft Maintenance Manual (AMM), reducing the risk of AOG (Aircraft on Ground) situations due to seal failure.
Installation & Maintenance Addendum
Cure Date Check: This part is subject to age-control. Always verify the Cure Date on the packaging to ensure the part is within its 84-month shelf life.
Gland Cleanliness: Before installation, inspect the metal groove for microscopic "nicks" or corrosion. Even a 0.001" scratch can provide a leak path that bypasses the 100-902-1911 seal.
Correct Lubrication: Apply a light coating of clean MIL-PRF-5606 (for hydraulic systems) or DC-4 (for static pneumatic systems) to prevent the O-ring from being cut during assembly.
