Inspection Procedures. - TB-1-1520-237-20-2520003

TB 1-1520-237-20-252

NOMENCLATURE

PART NUMBER

NSN

PIN-RIVET, GROOVED

NAS1446-29

5320-00-534-0831

PIN-RIVET, GROOVED

NAS1448-14

5320-00-551-0177

PIN-RIVET, GROOVED

NAS1448-20

5320-00-551-0174

PIN-RIVET, GROOVED

NAS1448-22

5320-00-558-3231

PIN-RIVET, GROOVED

NAS1448-31

5320-00-273-1675

Inspection Procedures.

a. Prepare aircraft for safe ground maintenance.

b. Gain access to Collective Boost and Yaw Boost Servo assemblies.

NOTE

The following steps are to be performed on both the Collective Boost and Yaw Boost Servos.

c. Conduct a visual inspection of the Servo assemblies for loose Collar and/or Swage Pin (Four on Yaw

Boost assembly and six on Collective Boost assembly).

d. Apply finger pressure to each fastener (Pin/Collar) to check for rotation or axial motion. (Refer to

TM 1-1520-237-23-6, paragraph 11-3-7.1 or TM 1-1520-250-23-5, paragraph 11.13.1.2).

NOTE

The Swage Pins and Collars that connect the input valve lever to the valve linkage may rotate in

the mount as an assembly. However, no Collar is allowed to rotate on any Swage Pin.

e. If any Collar is missing or rotates on Pin, or if any Pin and Collar assembly rotates in mount (Except

as noted above), or if any Collar has axial motion as described in TM 1-1520-237-23-6, paragraph 11-3-7.1

or TM 1-1520-250-23-5, paragraph 11.9.1.2, proceed as follows:

(1) Make the following entry on the DA Form 2408-13-1. Enter a Red //X// status symbol with

the following statement: "Swage Pins on (Collective and/or Yaw Boost Servo) assembly unserviceable IAW

TB 1-1520-237-20-252."

(2) Perform correction procedures IAW paragraph 9.

(3) Clear entry from paragraph 1.a. and report IAW paragraph 14.

f. If no discrepancies are found, inspection is complete. Clear entry from paragraph 1.a. and report

IAW paragraph 14.

9. Correction Procedures. If any Collar is missing or rotates on Pin, or if any Pin and Collar assembly

rotates in mount (Except as noted above), or if any collar has axial motion as described in TM

1-1520-237-23-6, paragraph 11-3-7.1 or TM 1-1520-250-23-5, paragraph 11.9.1.2, replace Boost Servo as-

sembly IAW TM 1-1520-237-23-6 or TM 1-1520-250-23-5.

10. Supply/Parts and Disposition.

a. Parts Required - Items cited in paragraph 6 may be required to replace defective items.

b. Requisitioning Instructions - Requisition replacement parts using normal supply procedures. All req-

uisitions shall use project code (CC 57-59) "X1R" (X-RAY-ONE-ROMEO).

NOTE

Project code "X1R" is required to track and establish a data base of stock fund expenditures in-

curred by the field as result of TB actions.

c. Bulk and Consumable Materials - N/A.

d. Disposition - Hold any discrepant part/component pending disposition instructions from logistical

point of contact in paragraph 16.