TB 1-1520-240-20-93
Inspection Procedures.
8.
a.
Prepare the aircraft for safe ground maintenance.
b. Visually inspect the forward and aft rotor system installation at the lag damper (shock absorber)
attachments (refer to TM 55-1520-240-23P-1, Figure 173, Item No. 5 or TM 1-1520-252-23P-2, Figure 05-1,
Item No. 5) and the forward and aft controls installation at drive arm attachment to the drive collar (refer to
TM 55-1520-240-23P-1, Figure 177, Item No. 41 or TM 1-1520-252-23P-2, Figure 05-6, Item No. 41), for
AN320-12 castellated nuts exhibiting the capital letter G vendor identification impression stamp.
C. If the impression stamp is anything other than a capital G, or there is none, no further action is
required. Record and report compliance with this TB IAW paragraph 14 below.
d.
If the impression stamp is the capital letter G, proceed to paragraph 9 below for corrective action.
9.
Correction Procedures.
a. Replace AN320-12 castellated nuts exhibiting the impression stamped letter "G", which is the regis-
tered logo of Greer Stop Nut Inc (CAGE 27687) with any other manufacturers AN320-12 castellated nut.
b.
Any AN320-12 castellated nuts in supply with an impression stamped letter "G" was manufactured
by Greer Stop Nut Inc and shall be disposed of by mutilation to prevent resale, or reuse.
10. Supply/Parts and Disposition.
a.
Parts Required. Items cited in paragraph 7 above may be required to replace defective items.
b.
Requisitioning Instructions.
(1) Requisition replacement parts through normal supply channels using normal supply proce-
dures. All requisitions shall use Project Code XC6 per this TB.
(2) Project Code is XC6 is required to track and establish a data base of stock fund expenditures
incurred by the field as a result of this TB.
c.
Bulk and Consumable Materials. N/A.
d. Disposition. After mutilation, dispose of removed components/parts IAW normal supply proce-
dures. A QDR is not required.
e.
Disposition of Hazardous Material. N/A.
11. Special Tools, Jigs and Fixtures Required. N/A.
12. Application.
a.
Category of Maintenance. AVUM.
b.
Estimated Time Required. Total of 1 man-hours using 1 person.
c. Estimated Cost Impact of Stock Fund Items to the Field. A total of eight P/N AN320-12, NSN
5310-00-176-8115 castellated nuts are required per aircraft at a cost of .29 per bag of 20.
d. TB/MWOs to be Applied Prior to or Concurrently with this Inspection. N/A.
e. Publications Which Require Change as a Result of This Inspection. The following publications were
previously changed to incorporate the correct torque values reflected in this TB:
(1) TM 55-1520-240-23-4, Chapter 5, Task 5-112.
(2) TM 1-1520-252-23-5, Chapter 5, Task 5-163.
13. References.
a. TM 55-1520-240-23-4.
b. TM 1-1520-252-23-5.
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