Honeywell RESCU 406AFN Component Maintenance Manual With Illustrated Parts List page 81

8. Service Bulletin Incorporation
A. Except as indicated, end units, subassemblies and detail parts subject to modification, deletion,
addition or replacement by an issued service bulletin are annotated to show both pre- and post-
service bulletin configuration. The term (PRE SB XXXX) in the DESCRIPTION column designates
the original configuration and the item (POST SB XXXX) identifies end units and parts after the
service bulletin modification has been completed.
B. Subassemblies and detail parts used on end units bearing the pre- or post-service bulletin notation
will not carry the same notation themselves if the effect code(s) assigned to them clearly reflect(s)
their pre- or post-service bulletin status.
C. End units subject to modification by a service bulletin without assignment of a new part number (no
production equivalent of the modified end unit) are not annotated with pre- or post-service bulletin
information.
D. If a subassembly or detail part is modified by a service bulletin without a new part number being
assigned, the original part number is listed with an alpha-variant item number and the term (POST
SB XXXX). The EFFECT CODE remains the same as for the pre-service bulletin configuration.
9. Item Numbering System used in Detailed Parts List
Each breakdown is presented in order of disassembly. At the time of initial preparation, item numbers
are allocated sequentially, starting within each figure at 1, and progressing 10, 20, 30, etc. Thus, errors
of omission can be rectified without having to resort to alpha-variants.
10. Alpha-Variant Item Numbers
A. Alpha-variants A – Z (except I and O) are assigned to existing item numbers when necessary to
show:
• Added items
• Service bulletin modifications
• Configuration differences
• Optional parts
• Product improvement parts (non-service bulletin)
B. Alpha-variant item numbers are not shown on the exploded view when the appearance and
location of the alpha-variant item are the same as those of the basic item.
11. Updating
A. When an item is revised, added or deleted, the letter "R" is shown in the left-hand margin and date
of issue will change.
B. When the entire page is changed for whatever purpose, a revision bar will appear opposite the
page number and the date of issue will change.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
COMPONENT MAINTENANCE MANUAL
1152682
23-24-02
Page 1004
Oct 27/06