TM 1-1520-240-10
2-7-4
2-7-12. Transmission Chip Detectors Fuzz Burn-
Off.
Helicopters equipped with the chip detector fuzz burn-off
system in the forward, combining (mix), aft, No.1 and No.
2 engine transmission, and aft rotor shaft thrust bearing
are identified by a module labeled PWR MDL CHIP
BURN-OFF located below the MAINTENANCE PANEL.
The chip detector fuzz burn-off system employs an oper-
ated fuzz burn-off electrical circuit with the ability to elimi-
nate nuisance automatically chip lights caused by minute
ferrous metallic fuzz or ferrous metallic particles on the
transmission chip detectors. The response time of the
fuzz burn-off circuit is more rapid than that of the helicop-
ter warning system; thus a successful fuzz burn-off will
be accomplished before any caution capsule on the mas-
ter caution panel illuminates. Should the particle or par-
ticles not burn off, the XMSN CHIP DET caution will illu-
minate. Also, the corresponding TRANSMISSION CHIP
DETECTOR or ENGINE CHIP DETECTOR magnetic
indicator on the MAINTENANCE PANEL will latch. Pow-
er for the PWR MDL CHIP BURN-OFF is supplied by the
No. 1 DC bus through the HYDRAULICS MAINT PNL
circuit breaker on the No. 1 PDP.
