Below are listed the engineering notices/changes and suggestions for the Bearhawk Patrol. They are generated by Bob Barrows (R & B Aircraft).

If you have any questions or comments regarding these notices, please contact:

Bob Barrows
2079 Breckinridge Road
Fincastle, VA 24090

(540) 473-3661

Important Engineering Terminology Differences (from April 2003 Beartracks)

"In order to standardize the use of the words below, it is necessary to define what each term means when it is published in the newsletter. Here is how we use the terms:

ENGINEERING CHANGE NOTICE: Design change that requires immediate attention to affected serial numbers. This NOTICE contains the technical information to correct the unsafe condition.
ENGINEERING CHANGE: A change to current serial number drawings onward - non-mandatory - may or may not be published. This change is the result of a product improvement, update or modification. Or a minor change of the design to ease manufacturing, maximize utility, economize materials or ease assembly.
ENGINEERING REPORT: Field or lab test data that is disseminated to the builder in the form of a report. An Engineering Report may generate an Engineering Change Notice or an Engineering Change or neither. The report may or may not validate the design. A summary of the results will always be attached with our thoughts and recommendations."

Please note that once a notice or update is released, all plans numbers from that time forward have already been changed to reflect the updates/notices. Therefore, if your plans are dated after the dates listed below, there is no need to do anything. Your plans should already reflect the changes.

Below are links to the Engineering Notices/Changes:

Engineering Change Notice 2007 - Tail spring mount change (drawing #21)

Engineering Notice 2007 - Shock Strut twist to be aligned with the air flow.

Engineering Change Notice 2008 - Changes to Rudder and Horizontal Stab.

Engineering Change Notice 2009a - Change to how brake mounting plate is attached to axle.

Engineering Notice 2009b - Change Fuselage Formers from Steel to Aluminum to save weight.

Engineering Notice 2009c - Tail Wire End Fittings (how to make your own).

Engineering Notice 2009d - Bending the Elev. Trim Tab pushrod.

Engineering Change Notice Jan 2010a - Landing gear shock strut alternate construction to prevent bending during ground loops on asphalt.

Engineering Change Notice Jan 2010b - Shock Strut attach bolt hole locations moved.

Engineering Change Notice Jan 2010c - rudder pedal location change.

Engineering Change Notice Jan 2010d - Change to flap handle system mounting.

Engineering Change Notice Jan 2010e - Change to Elevator Horn.

Engineering Notice April 2010a - Control stick mount bracket dimensions change.

Engineering Notice April 2010b - Rear seat mounting

Engineering Change Notice July 2010a - Change to aileron hinge mounts.

Engineering Notice July 2010b - Change to window hinge alignment

Engineering Change Notice Oct. 2010a - Elevator aft pushrod change.

Engineering Change Notice Oct. 2010b - Add a dampening bulkhead for the aft elevator pushrod.

Engineering Notice January 2011 - Improved method for mounting fuel line tee.

Engineering Change Notice - August 2011 - Changed angle of aileron pulley bracket in wing.

Engineering Change Notice - February 2012 - Changed dimension on Firewall.

Engineering Notice - February 2012 - Information on proper alignment of the wing strut end fittings.

Engineering Notice - March 2012 - Correction to tubing call-out on Drawing 19

Engineering Notice - December 2012 - Ref. Drawing #13 - Relocate Aileron Hinge Mounting holes for better clearance.

Engineering Change - January 2013 - Change door formers and seals to be made from aluminum instead of steel.

February 2013 Engineering Notice - A change to VNE at certain altitudes.

September 2013 Engineering Notice - A notice to add rudder stops.

December 2013 Engineering Notice - Call out for bolts and nuts at bottom of the control stick.

March 2014 Engineeering Change Notice - Ref drawing 17 - Plans #P270 and below - A change in Fuselage tubing layout.

September 2015 Engineering Change Notice - Flap and Aileron Hinge Covers

June 2016 Engineering Change - Landing Gear Shock Strut Tubing

March 2018 Engineering Change - Tail Post Reinforcement

March 2019 Engineering Change - Elevator Trim Cable Tension

February 2020 Engineering Change - Forward Wing Skin Stiffener

August 2020 Operation Notice - Fuel System Design for Fuel Pumps

April 2021 Engineering Change - Flap Hinge Drafting Error

June 2021 Engineering Change - Fabric Termination at Windshield

July 2021 Engineering Change - Flap Pulley Mount Reinforcement at Fuselage Station F

March 2023 Clarification of 12/2022 Engineering Change Notice - Maximum Airspeeds for Flaps Extended

March 2023 Safety Update - Landing Gear Spread Limits

July 2023 Safety Update - Brake Master Cylinders in Dual Applications