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Output Number
R20040078
Approval Date
Published Date Time
Recommendation type
Recommendation
Mode
Aviation
Date released

Safety Recommendation

As a result of this investigation the Australian Transport
Safety Bureau recommends that M7 Aerospace Pty Ltd review and amend
its Fairchild SA-227 series maintenance manual to ensure that notes
on operational tests, with regard to stabiliser movement versus
trim switch position referred to in Section 27-40-10 for removal of
the pitch trim switch, are included in Section 27-10-10 for related
maintenance activities, or references to them are clearly noted in
that part.

Organisation Response
Date Received
Organisation
M7 Aerospace
Response Text

The following response was received from M7 Aerospace on 12
January 2006.

The Fairchild SA227CC Maintenance Manual, chapter 27-1 0-1 0,
indicates the many discrete steps required to replace the Aileron
control Yoke Bearing, including the removal (step K.4) and the
re-installation (step L.5) of the Trim Control Switches. As with
most of the instructions identified in the Maintenance Manual, more
detailed procedures may be contained elsewhere in the manual to
provide the mechanic with specific installation and verification
instructions. In this instance MM chapter 27-40-10, page 201
provides the detailed instructions for the removal, replacement and
operational check of the Pilot and Copilot Trim Control Switches.
All repair personnel should familiarize themselves with the
complete scope of work instructions before attempting any repair
and in this case M7/Fairchild SA227CC Maintenance Manual provides
the mechanic with the data needed to install and check the
components affected by the replacement of the Aileron Control Yoke
Bearing.

Having said the above, M7 will at the next scheduled revision
add to MM chapter 27-1 0-1 0, page 201, Step L "Installation -
Control Wheel" a reference to MM chapter 27-40-1 0, page 201,
instructing the mechanic to perform the operational check of the
switches per step B.4 of the noted section.