TM 1-1520-265-23
6-4
Change 2
6.2 TOE PEDAL ACTUATOR (PT).
6.2.1
Description (Figure 6-1, Index No. 2). The toe pedal actuator attaches to the toe pedal
assembly. The toe pedal actuator senses foot contact on the pedal and activates a microswitch.
6.2.2
Defects. Defects may occur anywhere on the surface of the toe pedal actuator. No cracks
are allowed.
6.2.3
Primary Method. Fluorescent Penetrant.
6.2.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in
Table 1-7. AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table
1-8. Parts requiring flourescent penetrant inspection shall be cleaned prior to inspection with
n--Propyl Bromide (vapor degreasing only)(Table 1--8), DS--108 (Table 1--8), Electron (Table 1--8),
Positron (Table 1--8). DS--108, Electron, Positron must be followed by an acetone (Table 1--8) rinse
or wipe: or drying until there is no visible solvent residue left on parts.
6.2.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance.
A partial inspection for cause (visual indications, sites of mechanical damage, corrosion, etc.) may
be performed on all exposed surfaces of the installed part using this procedure. If required, the toe
pedal actuator shall be removed in accordance with the applicable technical manuals listed in Table
1-1.
6.2.3.3 Access. Access to the toe pedal actuator is from the cockpit area.
6.2.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
6.2.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent
Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 6-2.
6.2.3.6 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
6.2.4
Backup Method. None required.
6.2.5
System Securing. Clean the toe pedal actuator to remove inspection media. Refer to Post
Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The toe pedal actuator, if
removed, requires installation in accordance with the applicable technical manuals listed in Table
1-1.
Figure 6-2. Toe Pedal Actuator
