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Auxiliary Code Breakdown
The auxiliary code is the rst two characters in the serial number. The rst character
indicates the year. Years progress or regress in alphabetical order. The series runs from
"A" through "V" and the letters "I" and "O" are skipped. The second character indicates
signicant part changes within a year. Base is "5" and this number advances for each
change. In cases where there is a letter in parentheses, this designates the month. This is
the last character in the serial number. The series runs from "(A)" through "(M)" and the
letter "(I)" is skipped. This designation is only included when identifying a parts change
within an auxiliary code.
Note About Ordering Parts
Most assemblies cannot be ordered as complete units; parts in the assemblies generally
must be ordered separately.
CR1B-FG B50031B
CR1B-FS B50602B
CR1B-HS B50046B
CF1B-FG B50004D
CF1B-FS B50482C
CF1B-HS B50101B
Beginning Serial Numbers for Control Module Change
CR2B-FG B6 and later
CR2B-FS B50722C
CR2B-HS B50011B
CF2B-FS B50642B
CF2B-HS B6 and later
CR3B-FS B50082C
CR3B-HS B50001D
CF3B-FS B50053B
CF3B-HS B6 and later