5-3. Index of Part Numbers.
This index contains a complete listing of all items shown in the Detailed Parts List compiled in
alphanumeric sequence. The index is arranged in columns as follows:
a. The Part Number Column contains the part numbers of the manufacturer of the part or the part
number assigned to it by the Boeing Vertol Co. Requisition parts thru TM 55-4920-429-23P.
(1) Part number arrangement begins at the extreme left position and continues, one position at a
time, until all parts are arranged in sequence. The order of precedence, beginning the part number ar-
rangement at the extreme left (first) position, is as follows:
Letters A through Z for the alpha index
Numerals O through 9 for the numeric index
(2) The order of precedence in continuing the part number arrangement on the second and suc-
ceeding positions of the part number from left to right is as follows:
Space (blank column)
Dash or hyphen (-)
Letters A through Z, then
Numerals O through 9
Alphabetic (letter) O is listed as numerical zeros.
Examples of part number sequence:
b. The Figure and Index number columns contain the figure and index number listing/s assigned to
INDEX OF PART NUMBERS