VIKING 150 SERVICE BULLETINS

***PLEASE NOTE: THE REMOVAL OF ANY GEARBOX REQUIRES A NEW CENTERING BUSHING, EVERY TIME***


VIKING AIRCRAFT ENGINES

MANDATORY SERVICE BULLETIN

Subject: Viking 150 ECU Software Update

Affected Engines: All Viking 150 Engines

Compliance: MANDATORY – As Soon As Practical

Date Issued: October 21, 2026

Purpose

Viking Aircraft Engines is issuing a mandatory service bulletin requiring all Viking 150 engine owners and operators to return their Engine Control Unit (ECU) for a software update.

This update is designed to improve engine starting performance, provide smoother and more consistent starts, and reduce unnecessary strain on other engine components during the starting process.

Required Action

All Viking 150 owners and operators are required to:

  1. Remove the ECU from their Viking 150 engine.

  2. Securely package the ECU to prevent damage during shipping.

  3. Ship the ECU via UPS to Viking Aircraft Engines at the address below.

  4. Reinstall the updated ECU upon its return, following applicable installation procedures.

UPS Shipping Address

Viking Aircraft Engines

735 S. Air Park Road, Hangar C3

Edgewater, FL 32132

Shipping Carrier: UPS

Please include your name, contact information, engine serial number, and return shipping address inside the package.

Turnaround Time

Viking Aircraft Engines understands the importance of minimizing aircraft downtime.

ECUs received for this update can be updated and shipped back out the same business day they are received, subject to arrival time and carrier availability.

We encourage all owners to send their ECUs as soon as reasonably possible to ensure prompt compliance with this mandatory update.

Compliance

This update is classified as mandatory by Viking Aircraft Engines and applies to all Viking 150 engines.

We appreciate your cooperation and prompt attention as we continue improving the performance, reliability, and longevity of Viking Aircraft Engines.