TB 1--1520--240--20--144
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
SWASHPLATE ASSEMBLY
145R3551-ALL
ROTATING RING ASSEMBLY
114R3464-ALL
FWD STATIONARY RING ASSY 145R3351-ALL
AFT STATIONARY RING ASSY
145R3352-ALL
FWD STATIONARY RING ASSY 414R3351-1
1615-01-342-2310
FWD STATIONARY RING ASSY 414R3351-3
1615-01-474-4228
AFT STATIONARY RING ASSY
414R3352-3
1615-01-342-7961
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
NUT, SELF-LOCKING
FN22M-624
5310-00-184-0354
FWD STATIONARY RING
114R3351-ALL
AFT STATIONARY RING
114R3352-ALL
FWD STATIONARY RING
414R3351-2
1650-01-438-5361
AFT STATIONARY RING
414R3352-4
1650-01-439-4419
Inspection Procedures.
NOTE
Supplemental information (photos/graphics) for this inspection can be
viewed at: (use lower case)
"www.redstone.army.mil/sof/suppl/c47s0201.pdf"
For assistance contact the Safety point of contact in paragraph 16e (1).
a. Visually inspect forward and aft swashplate rotating rings, on aircraft, for correct self-locking nut
installation on the lower seal retainers. The correct self-locking nuts, P/N FN22M-624, should be installed
such that thread protrusion is evident.
NOTE
The incorrect nut height measures 0.425" -- 0.455" (NAS1758-L6)
The correct nut height measures 0.350" maximum (FN22M-624)
b. If correct nuts are found and thread protrusion is evident on all 18 bolts on each swashplate assem-
bly, no further action is required and the red dash // -- // entry required in paragraph 1a may be cleared.
c. If incorrect nuts are found or no thread protrusion is observed, the nuts shall be replaced, one at a
time, and the swashplate stationary ring inspected for damage.
(1) Visually inspect top surface of forward and aft swashplate stationary rings, on aircraft, for
grooves or gouges in the area underneath the lower seal retainer nuts.
(2) A groove in the stationary ring indicates an unserviceable swashplate assembly and requires
swashplate assembly replacement. Proceed to paragraph 9 for correction procedures.
3