RING SET (P/N 639721) - New Surplus

Part 639721 is a ring set for aircraft airframe assemblies, providing retention and spacing functions in structural component interfaces. This matched set typically consists of precision-formed rings manufactured to NAS specifications for dimensional consistency and load-bearing reliability. The rings maintain component alignment and secure fastener positioning in critical airframe locations.

Installation requires verification against the aircraft's Illustrated Parts Catalog and compliance with the applicable maintenance manual. Follow FAA AC 43.13-1B guidance for proper seating and torque procedures.

What is the RING SET (P/N 639721)?

Part 639721 is a ring set for aircraft airframe assemblies, providing retention and spacing functions in structural component interfaces. This matched set typically consists of precision-formed rings manufactured to NAS specifications for dimensional consistency and load-bearing reliability.

What certifications or documentation come with the 639721?

Depending on condition, the 639721 may include an FAA 8130-3 Airworthiness Approval Tag, a yellow serviceable tag, or manufacturer documentation. Currently available in: New Surplus. Contact us for specific documentation details on the condition you need.

Can I use the 639721 during an engine overhaul or annual inspection?

Yes, the RING SET can be used in engine overhauls and maintenance events. Always verify part compatibility against your engine's Type Certificate Data Sheet (TCDS) and Illustrated Parts Catalog (IPC) before installation.

What is the lead time for the 639721?

In-stock items ship same business day when ordered before 3 PM EST. We also offer 24/7 AOG (Aircraft on Ground) support at (904) 998-9101 for urgent engine part needs.