Hand-held magnetic coil may be used. Refer to paragraph 184.108.40.206.2 and Figure 1-6.
Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the engine mount
removed in accordance with the applicable technical manuals listed in Table 1-1.
Access. Remove engine.
Preparation of Part. The part shall be thoroughly cleaned. Refer to Preparation of Part or Area for NDI,
NDI Equipment Settings. Refer to Magnetic Particle Method, paragraph 1.4.8.
Inspection Procedure. A magnetic field shall be applied to the part perpendicular to the orientation of possible
cracks. Positions required for this inspection are illustrated in Figure 5-4.
Select AC on the AC/DC power switch.
Place probe/yoke on part in position 1 as shown.
Press the test switch and apply a light coat of magnetic particle. media at the same time. Remove the media
momentarily before removing the current. Current should be applied for no more than five seconds.
Inspect for cracks using the black light.
Demagnetize before moving to the next position. Refer to paragraph 220.127.116.11.
Repeat steps a. through e. for position 2.
Marking and Recording of Inspection Results. Mark and record the inspection results as requiredby paragraph
Demagnetization. With the switch remaining in the AC position, place the probe/yoke legs in the same position
used for magnetizing. Press the test switch and withdraw the probe/yoke from the part for a distance of two feet before
releasing the switch.
Backup Method. None required.
System Securing. Clean the engine mount thoroughly to remove all residual magnetic particle media. Refer to
Post Cleaning and Restoration of Part or Area After NDI, paragraph 1.4.16. The engine mount requires installation in
accordance with the applicable technical manuals listed in Table 1-1.
5.5 ENGINE TUBING, COUPLINGS, AIR DUCTS, FITTINGS, SUPPORTS, BRACKETS, AND CLIPS (PT).
Description (Figure 5-1. Index No. 5). This task is for all metallic, unpainted engine tubing, couplings, air
ducts, related fittings, supports, brackets, and bracket clips.
Defects. This inspection is used to verify crack indications found visually. No cracks are allowed.