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located at the upper and lower ends of the main rotor system consists of one steel shaft, one steel oil cooler
mast. shaft and five aluminum shafts. The shafts are
connected at each end by a flexible coupling. The
f . Chip D e t e c t o r Caution Message. Two system is supported by six hanger bearings, each being
electromagnetic chip detectors are mounted on the equipped with a grease fitting for lubrication.
transmission casing. One is located on top of the
transmission case and one is on the lower left side of
the case. Both chip detectors have fuzz burner 2-54. TAIL ROTOR GEARBOX ASSEMBLY.
capabilities that distinguish between a buildup of
normal wear particles and larger metal particles due to a. The tail rotor gearbox assembly (7, fig. 2-1) is
possible component failure. The chip detectors attached to the aft end of the tailboom. It is a 90-
automatically attempt to electrically burn off fuzz degree gearbox and serves as the final drive for the tail
accumulations. A CHIPS XMSN UPPER and/or CHIPS rotor. The gearbox is serviced through a non-vented
XMSN SUMP caution message will be displayed on the cap on the top of the case.
MFD when contact is made across the chip gap of
either chip detector. If the particles exceed the burnoff b. A sight glass is located at the rear of the case for
visual reference of the oil level. Normal oil quantity is
capability of the chip detector, the caution message will
indicated when oil level appears at the center of the
remain. If burnoff is accomplished, the message will be
sight glass. A (fuzz burner) electromagnetic chip
deleted. detector is located on the lower right side of the casing.
The chip detector has a fuzz burner capability that can
NOTE distinguish between a buildup of normal wear particles
and larger metal particles due to possible component
failure. The chip detector automatically attempts to
After three successful burnoffs of a chip burn off fuzz accumulations electrically. A CHIPS T/R
detector during any flight, the helicopter GRBX caution message will be displayed on the MFD,
shall be reported to maintenance, as soon and an audio tone will sound when metal particles are
as practical, for a serviceability check of the picked up by the plug. If the metal particles exceed the
transmission system. burnoff capability of the chip detector, the caution
2-39
TM 1-1520-248-10
message will remain. If burnoff is accomplished, the as practical, for a serviceability check of the
message will be deleted. tail rotor gearbox assembly.
NOTE c. A thermoswitch, located on the upper right area
of the case, transmits a HIGH TEMP T/R GRBX caution
After three successful burnoffs of a chip message that will be displayed on the MFD when the
detector during any flight, the helicopter temperature of the tail rotor gearbox exceeds allowable
shall be reported to maintenance, as soon limits.
SECTION VIII. ROTORS
2-55. MAIN ROTOR. bus from the lower mast torque meter transducer. A
backup system displays a digital readout of the rotor
The main rotor (fig. 2-19) consists of four composite RPM on the MPD (fig. 2-6).
blades (7) mounted to the yoke (1) to provide a soft-inplane
arrangement. All four blades can be folded back b. Low RPM Rotor Warning Message. The LOW
to aid in parking and transporting the helicopter. Each RPM ROTOR warning message will be displayed on
blade is attached to the grip by one bolt (8) and one pin
both MFDs anytime the lower limit of main rotor RPM is
type expandable bolt (4).
reached. It is accompanied by an audio tone in the
crew headsets. The tone is silenced by pressing the
2-56. TAIL ROTOR. REC/ACK switch (located on MFK) to ACK once. The
warning message will remain on the MFD until the rotor
The tail rotor system consists of two fiberglass blades RPM returns to the normal range when in flight. The
mounted to a tail rotor yoke. Power to the system is warning message is automatically stored in memory for
received through the tail rotor gearbox. Pitch change future recall.
inputs from the pilot or CPG antitorque pedals are
made through a pitch change control tube that slides c. High RPM Rotor Warning Message. The HIGH
through the center of the gearbox output shaft. A RPM rotor warning message appears on both MFDs
crosshead on the end of the control tube serves as the when the main rotor RPM reaches 107%. It is
attaching point for the pitch change links.
accompanied by an audio tone in the crew headsets.
The audio tone is silenced by pressing the REC/ACK
2 - 5 7 . I N D I C A T O R S AND C A U T I O N switch (located on MFK) to ACK once. The warning
MESSAGES. message cannot be deleted by the crew and will remain
on the MFD until the rotor RPM returns to the normal
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(22)
