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Gen II
User Manual
10-25 – Fan/Turbine Balance
Chapter 10
Revision 2.10, Apr 2020
“Remove Old Wts, Inst. New Wts” is shown. All previously installed weights
must be removed EACH TIME a new solution is installed. This means that
weights installed on the previous run of a balance job must be removed
completely before a new solution is installed. The example screen below shows
the suggested installation of class weights. Identified in the Name: Plane # line as
AN960- (this will be the name of the default class weight set as specified in
paragraph 10.1.3.2 above). The left column, with a heading of “Posn”, shows the
suggested position (or preferred term selected in paragraph 10.1.4.2 above) for
each class weight. To change the position, use the [
] [
] keys to move from
field to field. When the correct field is highlighted, use the [
] [
] keys to
change the value in that field. Entries in this field will either be the Hole/Position/
Blade number or a <?> symbol. The question mark indicates an undefined
location. They are placeholders for locations which can accept weight, but haven’t
been used yet. In the example below, weight may be placed in up to 11 locations.
At this point, weight has only been placed in location number 1. The other 10
weight locations have not been used yet and are marked with the <?> symbol. The
center column, with a heading of “Suggest” is the Class Weight suggested for that
Position. The right column, with a heading of “Install”, is the entry for the actual
Class Weight installed in a particular Position. To change the Class Weight
installed for each Position, use the [
] and [
] keys to move from field to field.
When the correct field is highlighted, use the [
] and [
] keys to change the
value in that field. In this case, the term “NULL” indicates that no weight will
occupy the other weight positions. If an actual weight or washer is identified as
the “null” weight (such as the “Bolt” or “P01” in paragraph 10.1.3.10 above), that
item will be suggested to occupy all unused weight positions when no balance
weight is suggested for the position. Near the bottom of the screen, you will see
the Total: “Soln =”, and the “Inst =”. The Soln field shows you the exact solution
required to balance the plane. The Inst field shows you the total you indicated
you have installed up to this point. If you do not agree with the Inst, review the
screen again and change weights as necessary. If you have installed the exact
weights and locations suggested, you need only press [OK] to continue. For a
description of the function key menu items, see paragraph 10.1.14.2 below.
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