Wed, May 06, 2009
AWB 55-007
Applicability: This
Bulletin refers to Robinson R22 helicopters of all models, and will
be of interest to:
- owners of Robinson R22 helicopters;
- maintenance organisations that carry out maintenance on R22
helicopters; and
- Licensed Aircraft Maintenance Engineers who carry out
maintenance on R22 helicopters
Purpose: The purpose of this Bulletin is to
recommend that registered operators and maintainers of R22s
consider the need to continue performing a maintenance operation
previously mandated by Australian AD.
Background: AD/R22/27 was
issued in 1986 following an accident caused by the vertical fin
separating from the tail-boom in flight. A second report of
cracking of the fin attachment bracket was also received. AD/R22/27
was not based on Robinson service documents.
In 2009 a review was conducted of all Airworthiness Directives
applicable to R22 helicopters. AD/R22/27 was cancelled because it
was not based on a foreign Airworthiness Directive or Robinson
service document, and because there have been very few defects
reported.
Maintenance: The following inspection should be
considered on helicopters with vertical fin to horizontal
stabilizer attachment brackets that have exceeded 500 hours time in
service.
At each scheduled inspection for issue of a new maintenance
release, remove the lower vertical fin and:
(a) visually inspect for fretting on the faying surfaces in the
vicinity of the fin attachment bolts;
(b) inspect the fin attachment brackets in the horizontal
stabilizer for cracking in the vicinity of the fin attachment bolts
using a dye penetrant technique.
Recommendation: It is recommended that owners
and maintainers of R22 helicopters remain aware of this maintenance
task and consider it carefully when planning maintenance of these
helicopters.
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