IMPULSE COUPLING (P/N m4501) - As Removed

The m4501 is a spring-and-flyweight mechanical assembly that retards ignition timing during engine cranking. This impulse coupling installs between the engine accessory drive and magneto on piston aircraft engines, briefly advancing timing to generate a strong spark at low cranking speeds. The internal flyweights snap the magneto back to normal timing once the engine reaches operating RPM.

Installation and timing must follow current engine and magneto maintenance manuals by qualified personnel. Essential for reliable cold-weather starting on general aviation aircraft.

What is the IMPULSE COUPLING (P/N m4501)?

The m4501 is a spring-and-flyweight mechanical assembly that retards ignition timing during engine cranking. This impulse coupling installs between the engine accessory drive and magneto on piston aircraft engines, briefly advancing timing to generate a strong spark at low cranking speeds.

What certifications or documentation come with the m4501?

Depending on condition, the m4501 may include an FAA 8130-3 Airworthiness Approval Tag, a yellow serviceable tag, or manufacturer documentation. Currently available in: As Removed. Contact us for specific documentation details on the condition you need.

Can I use the m4501 during an engine overhaul or annual inspection?

Yes, the IMPULSE COUPLING 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 m4501?

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.