?unique=9b8a65a)
100-155-8815 – Textron Aviation OEM Specialized Seal
Available now through the AirParts Aero marketplace.
Overview Section
The Textron Aviation 100-155-8815 is a high-precision OEM Seal designed for specialized applications within the Beechcraft and Cessna airframes. This part number is typically associated with Environmental Control Systems (ECS) or Pressurization Manifolds, where a high-integrity barrier is required to maintain cabin pressure or direct high-velocity bleed air.
Manufactured to the rigorous standards of Textron Aviation’s type certificates, the 100-155-8815 is engineered to survive the extreme pressure differentials and thermal cycling found in turboprop and light jet operations. Whether used in a static manifold interface or as a dynamic seal for a butterfly valve, its material composition is optimized for longevity and resistance to the harsh chemicals found in the engine nacelle.
Key Features Section
Aerospace-Grade Elastomer: Fabricated from advanced synthetic compounds (such as Fluorocarbon or high-temp Silicone) designed to resist degradation from ozone and UV at high altitudes.
Thermal Stability: Engineered to maintain its elastic "memory" and sealing force from the sub-zero temperatures of high-altitude flight to the intense heat of engine bleed air systems.
Precision Profile: Features a specialized cross-sectional geometry (often a customized "D-ring" or "Lip" profile) to provide a zero-leak interface within the specific dimensions of Textron-designed glands.
Chemical Resistance: Highly resistant to incidental exposure to hydraulic fluids (Skydrol or MIL-H-5606), turbine oils, and de-icing agents.
Pressurization Optimized: Specifically tested to withstand the rapid pressure changes associated with aircraft climbs and descents without "explosive decompression" of the seal material.
OEM Reliability: Sourced directly through Textron Aviation to ensure the metallurgy or chemistry matches the original engineering specifications for Beechjet, King Air, or Citation platforms.
Technical Specifications Section
| Specification | Detail |
| Part Number | 100-155-8815 |
| Manufacturer | Textron Aviation (Beechcraft / Cessna) |
| Component Group | ECS / Pressurization / Fluid Sealing |
| Material | High-Performance Synthetic Elastomer |
| Application | Airframe / Engine Interface Sealing |
| Service Limit | Replace per Maintenance Manual / Condition |
| Configuration | Preformed Specialized Seal |
Aircraft Compatibility Section
The 100-155-8815 is a specialized component found in the maintenance manuals of several high-performance airframes in the AirParts Aero inventory:
Beechcraft King Air Series: Often utilized in the Bleed Air Heat Exchangers and cabin pressurization valves of the 90, 200, and 300 series.
Beechjet 400A / Hawker 400XP: Found in the environmental system ducting and engine pylon interface seals.
Cessna Citation: Used in secondary structural seals or specialized fluid manifolds for various jet models.
Raytheon T-1A Jayhawk: Military-spec reliability for the training variants of the Beechjet 400T.
Technical Applications & Safety
In pressurized aircraft, seals like the 100-155-8815 are critical for maintaining the "Pressure Vessel" integrity. A failure of an ECS seal doesn't just result in a loss of cabin comfort; it can lead to an inability to maintain cabin altitude, forcing an emergency descent.
Safety Warning: Always inspect the mating surfaces for "pitting" or "wire-drawing" (small erosion paths in the metal) before installing a new 100-155-8815. If the metal surface is damaged, the new seal will fail prematurely. Never use standard RTV silicone in place of an OEM seal unless specifically authorized by the Structural Repair Manual (SRM), as unapproved adhesives can cause corrosion on the aluminum airframe.
Technical Engineering Insight
The engineering value of the 100-155-8815 lies in its Compression-to-Load Ratio. In complex manifolds, the seal must be soft enough to accommodate the expansion of metal ducting as it heats up, yet stiff enough to resist "extrusion" when the cabin is under maximum pressure. The 100-155-8815 is designed with a specific "swell rate" that helps the seal "self-energize" as it comes into contact with operating temperatures.
By sourcing this part through AirParts Aero, you ensure that the seal has been stored in a climate-controlled environment to prevent "age-hardening," a common issue with surplus seals that causes them to crack upon the first application of pressure.
Installation & Maintenance Addendum
Gland Cleanliness: Use only approved solvents (like MEK or High-Flash Naphtha) to clean the seal groove. Residue from old seals can prevent the 100-155-8815 from seating correctly.
Lubrication: If required by the manual, use a very thin film of Dow Corning 4 or an equivalent silicone lubricant to prevent the seal from "rolling" or "spiraling" during the assembly of the manifold.
Shelf Life Check: Always verify the cure date on the packaging. Specialized elastomers like those in the 100-155-8815 have a finite shelf life and must be replaced if the material shows signs of "crazing" or stiffness.
