f. Oversize and Undersize Parts. When studs, bushings, etc., are listed, the degree of oversize or undersize is
stated in the description. These parts will have a required quantity shown.
g. Directional References. Left and right directions are determined by standing at the rear of the aircraft or engine
and looking forward.
h. Shipping and Storage Containers. This manual does not list spare and repair parts required for maintaining
shipping and storage containers for T55-L-712 engines and modules. Refer to TB 55-8100-200-24, Maintenance of
Specialized Reusable Containers for Aircraft Equipment, for requisitioning spare and repair parts.
7. HOW TO LOCATE REPAIR PARTS
a. When National Stock Numbers or Part Numbers are Not Known.
(1) First. Using the table of contents, determine the assembly group or subassembly group to which the item
belongs. This is necessary since figures are prepared for assembly groups and subassembly groups, and listings are
divided into the same groups.
(2) Second. Find the figure covering the functional group or the subfunctional group to which the item belongs.
(3) Third. Identify the item on the Illustration and note the item number.
(4) Fourth. Look in the repair parts List for the figure and item numbers. The NSNs and part numbers are on
the same line as the associated item numbers.
b. When National Stock Number or Part Number is Known.
(1) First. If you have the national stock number, look in the STOCK NUMBER column of the National Stock
Number Index. The NSN is arranged in national item identification number (NIIN) sequence (see paragraph 4. a. (1)).
Note the figure and item number next to the NSN.
(2) Second. Turn to the figure and locate the item number. Verify that the item is the one you are looking for.
If you have the part number, look in the PART NUMBER column of the part number
index. Identify the figure and item number, look up the item on the figure in section II.
7. ABBREVIATIONS. (Not applicable.)