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2 AC bus through the WSHLD ANTI ICE HEAT PILOT
and CTR circuit breakers. Power for the copilot windshield
is from the No. 1 AC bus through the WSHLD
COPLT HEAT circuit breaker on the No. 1 PDP. Anti-ice
control for the pilot and center windshield is from the
28-volt No. 2 DC bus through the WSHLD ANTI ICE
CONT CTR and PILOT circuit breakers on the No. 2 PDP.
Anti-ice control for the copilot windshield is from the
28-volt No. 1 DC bus through the WSHLD COPLT CONT
circuit breaker on the No. 1 PDP. Power to operate the
heater elements in the pitot tubes and yaw ports is supplied
by the No. 2 AC bus through the PITOT HEAT and
YAW PORT HEAT circuit breakers on the No. 2 PDP.
a. W/S Switches. The pilot and copilot windshields
are anti-iced and defogged electrically. The center windshield
is defogged but not anti-iced. The laminated windshield
panels are heated electrically by current which
passes through a transparent conductive coating embedded
between the layers.
Figure 2-9-1. Anti Ice Panel
CAUTION
If windshield bubbling or delamination occurs
around the sensor element, immediately
place switch to OFF for that windshield.
When any switch is moved to ON, current flows to the
associated temperature controller and then to the windshield.
As the temperature of the windshield rises to a
preset value (about 44), as sensed by the sensor element,
the electrical current to the windshield is interrupted
by the temperature control relay. Once the windshield
has cooled sufficiently, electrical current is
reapplied. This causes a cycling effect which maintains
windshield temperature within operating limits.
Operating temperature is on in less than 1 minute after
the switch is placed to on. When the switch is placed to
OFF, the anti-icing system is deenergized.
b. PITOT Heat Switch. Heating elements prevent
ice accumulation in the pitot tubes and the yaw ports.
When the PITOT switch is placed to ON, power to the
heater elements in the pitot tubes and yaw ports is applied.
When the switch is placed to OFF, the heating
elements are deenergized.
2-9-3. MAINTENANCE PANEL.
The MAINTENANCE PANEL is on the right side of the
cabin above the ramp (fig. 2-9-2). The panel is provided
to assist in the identification of system malfunction or
condition that may require servicing or other maintenance.
The panel is divided into four sections. They are
labeled TRANSMISSION, HYDRAULICS, ENGINE, and
GROUND CONTACT.
2-9-4. TRANSMISSION Section.
This section monitors the FWD, COMB, AFT, AFT
SHAFT, LEFT, and RIGHT transmissions. It consists of
six CHIP DETECTOR magnetic indicators, six DEBRIS
SCREEN a magnetic indicators, six MAIN OIL PRESS
indicating PRESS-TO-TEST lights, three AUX OIL
PRESS indicating PRESS-TO-TEST lights, and five
OVERTEMP magnetic indicators. Power to operate the
indicators is supplied by the No. 1 DC bus through the
HYDRAULIC MAINT PNL circuit breaker on the No. 1
PDP.
a. CHIP DETECTOR Magnetic Indicators. When
the corresponding CHIP DETECTOR is bridged by ferrous
particles, the associated chip detector indicator
changes from all-black to black-and-white. In addition,
the XMSN CHIP DET or ENG CHIP DET caution capsule
illuminates on the master caution panel.
TM 1-1520-240-10
2-9-2
LEFT RIGHT
Figure 2-9-2. Maintenance Panel
b. DEBRIS SCREEN Magnetic Indicators. There is
one indicator each for the FWD transmission, AFT transmission,
and the Left (No. 1) and Right (No. 2) engine
transmissions. There are two indicators for the COMB
transmission. one indicator for the left sump and one indicator
for the right sump.
NOTE
Their is no cockpit indication of a latched DEBRIS
SCREEN magnetic indicator. If a DEBRIS
SCREEN magnetic indicator latches,
the flight engineer shall advise the pilot immediately.
The indicators are electrically connected to screens in
the sumps of each transmission. If the screen mesh is
bridged with conductive particles, the indicating circuit
closes and trips the corresponding DEBRIS SCREEN
magnetic indicator on the MAINTENANCE PANEL.
c. MAIN OIL PRESS indicating Lights. If main oil
pressure drops below 20 psi in any transmission or 10
psi in the aft shaft bearing, the corresponding indicating
light will illuminate. in addition, the XMSN OIL PRESS
caution will illuminate on the master caution panel.
d. AUX OIL PRESS indicating Lights. If auxiliary oil
pressure drops below 20 psi in the FWD or AFT transmission
or 10 psi in the COMB transmission, the corresponding
indicating light will illuminate. In addition, the
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