TB 1-1520-237-25-2
PYLON HINGE
Figure 11. TAIL PYLON STRUCTURE
2.2.3.5 Tail Pylon Section Evaluation: Discrepancies found in the tail pylon section should be noted
and considered when evaluating the overall condition of the aircraft. The tail pylon section is not as critical an
area as other sections of the aircraft for depot induction. The entire tail pylon can be removed and replaced
at the organizational level (Figure 11).
Exterior Sheetmetal: Examine exterior skin of the tail pylon section (F.S. 647.5 - 762.75) for
evidence of dents, cracks, chafing, buckling, loose or missing fasteners, and corrosion.
Interior: Remove the pylon flight control access panel and inspect accessible interior for
evidence of cracks, corrosion, and loose or missing fasteners. Examine the lower step
guide pin for security, and examine the surrounding pulleys for damage. Also , examine the
airframe under the tail rotor drive shaft and the skin where the drive shaft and gearbox
access panels attach for excess wear, cracks, corrosion, security, and loose or missing
fasteners.
Deleted.
Intermediate and Tail Gearbox Mounts: Inspect the mounting areas the intermediate and
tail gearboxes for cracks, corrosion, loose or missing fasteners, and deterioration of sealant.
Stabilator and Tail Skid: Check the stabilator and tail skid for security, cracking, excess
wear, loose or missing fasteners, and corrosion.
Change 1 A-I7
