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Date: Fri, 22 Jul 2005 19:01:55 -0400
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From: Tammy and Mike Salzman <arrow54t@yahoo.com>
Reply-To: arrow54t@yahoo.com
Subject: Re: [LML] Brake Conditioning
In-Reply-To: <list-610259@logan.com>
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Hi Bob,

From the Cleveland Wheels & Brakes Maintenance manual (AWBCMM0001-5):


Lining conditioning procedures:


When new linings have been installed, it is important to condition them
properly to obtain the service life designed into them.  The metalic
and organic linings are not conditioned in the same manner because they
have different operating characteristics.

For nonasbestos organic linings:

1.  taxi aircraft for 1500 feet with engine at 1700 rpm applying brake
pedal force as needed to develop a 5-10 mph taxi speed.

2.  allow the brakes to cool for 10 to 15 minutes.

3.  apply brakes and check for restraint at high static throttle.  If
brakes hold, conditioning is complete.

4.  if brakes cannot hold aircraft during static run up, allow brakes
to completely cool, and repeat steps 1 through 3.


For metalic linings:

1.  perform two consecutive full stop braking applications from 30 to
35 knots. do not allow the brake discs to cool substantially between
the stops.

2.  allow the brakes to cool for 10 -15 minutes.

3.  apply brakes and check for restraint at high static throttle.  If
brakes hold, conditioning is complete.

4.  if brakes cannot hold aircraft during static run up, allow brakes
to completely cool, and repeat steps 1 through 3.

This conditioning procedure will wear off high spots and generate
sufficient heat to create a thin layer of glazed material at the lining
friction surface.  Normal brake usage should generate enough heat to
maintain the glaze throughout the life of the lining.

A smooth surface, one without grooves, indicates the linings are
properly glazed.  if the disc is rough (grooved), the linings must be
reglazed.  The conditioning procedure should be performed whenever the
rough disc condition is observed.  Light use, such as in taxiing, will
cause the glaze to be worn rapidly.

Hope this helps,

Mike Salzman
Fairfield, CA
LNCE


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