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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
PRESSURE & TEMPERATURE
MONITORING
A low pressure switch is located in each
of the
outboard quill assemblies, and an
oil temperature warning switch is located
in the
main oil manifold. If either low
pressure switch senses transmission oil
pressure below 30 PSIG, or if the
temperature switch senses temperature
above 110°C, then the RED warning/
caution indication XMSN OIL (along with
the MASTER CAUTION light) in the IIDS
is illuminated. An oil temperature bulb,
and an oil pressure transducer provide
temperature and pressure signals to the
IIDS.
Six chip detectors are located in the
transmission to provide both
warning and
d
iagnostic information. The two upper
detectors monitor the upper mast bearings
and the planetary gears and bearings.
Chip collectors prevent secondary
contamination of the transmission and
isolate sources of debris. The four lower
detectors monitor the left and right input
gears, freewheeling units, lower mast
bearings and sump / pump inlet. The
four
lower detectors are installed in self closing
fittings, to
prevent oil spillage when
removed for inspection. The detectors
interface with the CDPU and IIDS to provide
chip indications, "FUZZ BURN" control, and
continuous continuity test of the system
circuits.
CHIP DETECTION
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