The 06A19956 seal is an aircraft vacuum pump oil seal used in Lycoming engine accessory systems, specifically in the Garlock vacuum pump drive area. It is a rotary shaft seal designed to retain oil and prevent leakage while allowing the vacuum pump drive shaft to rotate smoothly under engine operation.

This part is commonly referenced as an alternative to STD-2217, meaning it serves the same function and dimensional specification in aircraft maintenance and overhaul applications.

It is typically installed in the engine accessory housing or vacuum pump interface, where it helps maintain lubrication integrity and prevents contamination of the drive system.

Key features include:

Aircraft-grade rotary oil/vacuum pump shaft seal
Used in Lycoming engine accessory drive systems
Prevents oil leakage from vacuum pump assembly
Maintains lubrication and excludes contaminants
Replacement / alternate to STD-2217 seal specification
Designed for high RPM shaft rotation environments
Typically elastomer (NBR or Viton) with metal case
Used in certified aircraft engine maintenance and overhaul
Compatible with Garlock-style vacuum pump configurations