TM 1-1520-265-23
Change 2
5-3
5.2 DESWIRL DUCT VANES AND LOOP CLAMP (PT).
5.2.1
Description (Figure 5-1, Index No. 2). The deswirl duct, containing the deswirl duct vane
is attached to the engine power turbine flange by a loop clamp.
5.2.2
Defects. This inspection is used to verify crack indications found visually on the deswirl duct
vanes and the loop clamp. No cracks are allowed.
5.2.3
Primary Method. Fluorescent Penetrant.
5.2.3.1 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.
5.2.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and
the deswirl duct and loop clamp removed in accordance with the applicable technical manuals listed
in Table 1-1.
5.2.3.3 Access. Not applicable.
5.2.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4.
5.2.3.5 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 5-2.
5.2.3.6 Marking and Recording of Inspection Results. Mark and record inspection results as
required by paragraph 1.3.
5.2.4
Backup Method. None required.
5.2.5
System Securing. Clean the duct vanes and loop clamp to remove inspection media. Refer
to Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The duct vanes and
loop clamp require installation in accordance with the applicable technical manuals listed in Table
1-1.
5.3 ENGINE TUBING, COUPLINGS, AIR DUCTS, FITTINGS, SUPPORTS, BRACKETS, AND
CLIPS (PT).
5.3.1
Description (Figure 5-1, Index No. 3). This task is for all metallic, unpainted engine tubing,
couplings, air ducts, related fittings, supports, brackets, and bracket clips.
5.3.2
Defects. This inspection is used to verify crack indications found visually. No cracks are
allowed.
5.3.3
Primary Method. Fluorescent Penetrant.
5.3.3.1 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.
