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circuit. The MASTER CAUTION display is also pushbutton
operated; it is the only amber light on the master
caution panel. Initially, when a caution/warning
panel segment illuminates, it will flash. Simultaneously,
the MASTER CAUTION will flash. Pressing the
MASTER CAUTION light segment will extinguish
the lamp and convert the illuminated fault segment to
steady on. The MASTER CAUTION lights are individually
reset in each crew station. and will remain on
until the fault or condition is corrected. Warning lights
are red, and when lighted, require immediate crewmember
attention. The master caution panel segments
are described in table 2-3.
Figure 2-43. Pilot and CPG Master Caution Panel
2-77
TM 1-1520-238-10
Table 2-3. Master Caution Panel Indications
Word Segment
MASTER CAUTION
LOW RPM ROTOR
FIRE APU
ENGINE 1 0UT
ENGINE CHOP
ENGINE 2 OUT
HIGH RPM ROTOR
-701 ENGINE
HIGH RPM ROTOR
-701C ENGINE
BUCS FAIL
PRESS TO TEST
Color
AMBER
RED
RED
RED
RED
RED
RED
RED
RED
WHITE
Illumination Parameter or Fault
Alerts both crewmembers to scan both their master caution/warning
panels and caution/warning panels to identify fault condition.
Nr is less than 94%.
Fire has been detected in the APU area or aft deck area.
Np is below 94% or NG is below 63% on No. 1 engine. (Np disabled
when the PWR lever is not in FLY).
Both engines have been electrically retarded to idle power.
Np is below 94% or NG is below 63% on No. 2 engine. (Np disabled
when the PWR lever is not in FLY).
Nr is more than 104%.
Nr is more than 108%.
One of the following BUCS components has indicated a failure
a.
b.
c.
d.
e.
f.
g.
h.
Control position transducer failure or misadjustment.
Flight control actuator malfunction.
BUCS tracer wire failure.
DASEC NO-GO.
BUCS select trigger pressed.
BUCS circuit breaker out.
No ac power to the DASEC.
No primary hydraulic pressure.
When depressed, all master caution panel and caution/warning panel
segments, plus all other advisory lights, are illuminated within that
crew station for test.
2.52.1 Pilot and CPG Caution/Warning Panels. The
caution/warning panels, for the pilot and CPG (fig 2-44)
are described in tables 2-4 and 2-5. Primarily cautionary
in nature, the panels also include red warning segments.
Often a specific fault indicated on the pilot panel
will only light a general system segment on the CPG
panel. Illumination of a segment on one crewmembers
panel will not cause illumination of the MASTER
CAUTION light in the other crew station.
a. Warning and Caution Segment Dimming.
Dimming of all caution/warning light segments
is controlled by the INST control on both the pilot and
CPG INTR LT control panels (fig 2-42) for the respective
crew station. When the INST control is in the OFF
position, caution/warning lights are bright; any other
position will cause the respective lights to go to a preset
dim condition.
2-78
TM 1-1520-238-10
Figure 2-44. Pilot and CPG Caution/Warning Panels
2-79
TM 1-1520-238-10
2-80
Figure 2-44.1 Pilot and CPG Caution/Warning Panels (Modified)
Change 2
TM 1-1520-238-10
Table 2-4. Pilot Caution/Warning Light Segments
Word Segment Color I Illumination Parameter or Fault
IFF
ENG ICE
BUCS ON
CHIPS ENG 1
OIL PSI ENG 1
OIL BYP ENG 1
FUEL BYP ENG 1
FUEL PSI ENG 1
ROCKET
MISSILE
RTR BK
MAN STAB
CHIPS NOSE GRBX 1
OIL PSI NOSE GRBX 1
OIL HOT NOSE
GRBX 1
BLADE ANTI ICE
FAIL
CANOPY ANTI ICE
FAIL
ENG 1 ANTI ICE
ENG 2 ANTI ICE
GUN
TADS
PNVS
RED
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
RED
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
Mode 4 is not able to respond to interrogation.
Ice detector probe indicates icing conditions are present.
Backup control system is activated in at least one control axis.
No. 1 engine scavenge oil contains metal fragments.
No. 1 oil pressure is below 25 psi.
No. 1 engine oil filter is clogged, and bypass has begun.
No. 1 engine fuel filter is clogged, and bypass has begun.
No. 1 engine fuel pressure is less than 9 psi.
Spare.
Failed system.
Failed system.
Hydraulic pressure is being sensed at the rotor brake by the in-line
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