CHAPTER 51
PAGE 39
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 1. August 2014
b) Re-bonding of loose main wing spar flange
bushings
Figure 11 Wing main spar attachment flange bushings
Main attachment bushings positioned in the web of the main
wing spar exists of a front and a rear flange bushing. The front
and rear flange bushing will be re-bonded one after another.
There is a defined bond gap between the flange bushings and
the hole in the main spar web.
Re-bonding of main attachment flange bushings positioned
in the web of the main wing spar is only permissible if the
hole in the related spar web is not elongated or has impermis-
sible irregular wear which is evidence of bearing stress
exceedance. In case an elongated hole, a crushed plywood
insert or a fuzzy or delaminated surrounding fiber plies are
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