Below are listed the engineering notices/changes and suggestions for the Bearhawk Patrol, put out by R & B Aircraft. These were directly scanned from the Bear-Tracks newsletters If I have missed any, please notify me via email and I will update it. These were re-printed by permission of Bob Barrows (R & B Aircraft).
This webpage will be update as any changes or updates come out.
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
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 above:
ENGINEERING CHANGE NOTICE: Design change that requires immediate
attention to affected serial numbers. This CHANGE notice contains the
technical information to correct the unsafe condition.
ENGINEERING NOTICE: 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onward - non-mandatory - may or may not be published.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 onstruction 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.
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