HOW TO USE THIS ILLUSTRATED PARTS BREAKDOWN

TM 55-4920-328-13-2

O - T73 Engines

indicates the complete item or major assembly. Part

P - T74 Turboprop Engines

number descriptions under 2 through 7, indicate

V - T700-GE-700, -701 Turboshaft

components of the previous assembly.

Engines

W - T700-GE-701C Turboshaft

(2) Vendor Code. Except for Government

Engines

Standard parts, "No Number" parts and commercial

(COML) parts, the part number column lists the true

manufacturers part number. When the part number

7-7. HOW TO USE THIS ILLUSTRATED

listed is not an Avco Lycoming Division or Government

PARTS BREAKDOWN .

Standard part number, a vendor's code number is used

to indicate the manufacturer. This is a five digit number.

a. When Part Number is Known. To find the

The vendor's name and address can be obtained by

illustration and part description, proceed as follows:

referring to table 7-1.

(1) Locate the part number in Section III,

d. Quantity Per Assembly. The quantity per

Numerical Index.

assembly column lists the total quantity of the listed part

required in the immediate assembly. The abbreviation

(2) Note the figure and index number opposite

"Ref" indicates that the part number listing is repeated

the part number.

and reference should be made to its first listing.

(3) Refer to the figure and index number in this

e. Usable on Code. Kit parts variations are

section.

indicated by letter symbol in the Usable on Code column.

When this column is left blank, the part listed applies to

(4) The part will be found in the illustration as

all engines covered by the applicable engine accessories

indicated by the index number.

listed in this section.

The code letters used are

explained as follows:

(5) The description of the part will be found in

the Group Assembly Parts List opposite the index

A - T53-L-5, -9A, -9B Turboshaft

number.

Engines

B - T53-L-11 Turboshaft Engine s

b. When Part Number is Not Known. To find the

C - T53-L-11A Turboshaft Engines

part number, proceed as follows:

D - T53-L-11B Turboshaft Engines

E - T53-L-13 Turboshaft Engines

(1) Refer to the Table of Contents for page

F - T53-L-13A Turboshaft Engines

number of the figure that illustrates the required part.

G - T53-L-7 Turboprop Engines

H - T53-L-15 Turboprop Engines

(2) Locate the part on the illustration and note

J - T55-L-7 Turboshaft Engines

the index number.

K - T55-L-7C Turboshaft Engines

L - T55-L-11 Turboshaft Engines

(3) Refer to the index number in the Group

M - T63 A-5A Turboshaft Engines

Assembly Parts List for the part number and description

N - T63 A-700 Turboshaft Engines

of the item.

Change 5 7-2