The 1001994 “Seal Outside” is an outer wheel bearing seal used in aircraft landing gear wheel assemblies, commonly found in Wipline float wheel systems and similar aviation wheel/brake assemblies. It is designed to retain grease inside the wheel bearing cavity and prevent contamination from water, dust, and debris entering the hub.

It works as part of a paired sealing system:

Outer seal (1001994)
Inner seal (1001996)
These seals are installed on opposite sides of the wheel hub and are critical for maintaining bearing lubrication and extending service life in high-moisture environments such as amphibious aircraft operations.

Key features include:

Aircraft wheel hub outer bearing seal
Prevents grease leakage and contamination ingress
Used in floatplane and amphibious wheel assemblies
Works with tapered roller bearing systems
Designed for high-moisture and corrosion-prone environments
Typically installed in Wipline 10000/13000 series wheel assemblies
Durable elastomer/metal composite construction (variant dependent)
Critical for bearing longevity and smooth wheel rotation