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One or more components of the automatic stabilization equipment is
inoperative; one or more of the SAS channels is inoperative or has
been selected OFF.
NOTE
Low fuel caution systems alert the crew that the fuel level in the tank has reached a specified level
(capacity). Differences in fuel densities due to temperature and fuel type will vary the weight of the
fuel remaining and the actual time the helicopter engine(s) may operate. Differences in fuel consumption
rates, aircraft attitude, and operational conditions of the fuel subsystem will also affect
the time the helicopter engine(s) may operate.
FUEL LOW FWD
FUEL LOW AFT
EXT EMP
REFUEL VALVE
OPEN
OIL PSI ACC PUMP
TEMP INT
CHIPS ENG 2
OIL PSI ENG 2
OIL BYP ENG 2
FUEL BYP ENGINE 2
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
When light comes on, approximately 260 pounds of fuel remains in the
forward fuel cell.
When light comes on, approximately 210 pounds of fuel remains in the
aft fuel cell.
All external fuel tanks are empty.
Refuel valve is open.
Main transmission accessory gearbox oil pressure is below 26 - 30 psi.
Intermediate gearbox temperature is above 274°-294 °F (135° - 145
°C).
No. 2 engine scavenge oil contains metal fragments.
No. 2 engine oil pressure is below 25 psi.
No. 2 engine oil filter is clogged, and bypass has begun.
No. 2 engine fuel filter is clogged, and bypass has begun.
2-82
TM 1-1520-238-10
Table 2-4. Pilot Caution/Warning Light Segments - continued
Word Segment
FUEL PSI ENG 2
ECS
APU ON
APU FAIL
VIB GRBX
FUEL XFR
FUEL XFR
Modified C/W panel
FUEL XFR
Modified C/W panel
X FEED
Modified C/W panel
X FEED
Modified C/W panel
ADS
BOOST PUMP ON
RDR JAM
IR JAM
Word Segment
IFF
ENG 1
MAIN XMSN 1
GUN
Color
RED
AMBER
AMBER
AMBER
AMBER
AMBER
GREEN
AMBER
GREEN
AMBER
AMBER
AMBER
AMBER
AMBER
Table 2-5.
Color
RED
AMBER
AMBER
AMBER
Illumination Parameter or Fault
No. 2 engine fuel pressure is less than 9 psi.
The overheat sensor has sensed a mixed air FAB temperature greater
than 105°F (41°C).
APU operation when APU NG speed is above 95%.
Indicates one of the following APU thermocouple malfunction,
overtemperature, overspeed, low APU oil pressure, or overcurrent.
Intermediate or tail rotor gearbox vibration level is excessive.
TRANS switch is in the TO FWD or TO AFT position and fuel transfer
is not occurring.
TRANS selected, transfer is occurring.
TRANS selected, transfer is not occurring.
CROSSFEED selected, fuel valves are correctly positioned.
CROSSFEED selected, fuel valves are incorrectly positioned.
Failed system.
Boost pump operation is on and providing 8 to 10 psi in fuel line to fuel
filter.
AN/ALQ-136 has failed, is off, or is in a warm-up cycle.
AN/ALQ-144 has failed, or is in warm-up/cooldown cycle.
CPG Caution/Warning Light Segments
Illumination Parameter or Fault
Mode 4 is not able to respond to interrogation.
One or a combination of the following engine oil pressure low, engine
oil filter in bypass, engine chips, engine fuel filter in bypass, engine
fuel pressure low, nose gearbox chips, nose gearbox oil pressure low,
nose gearbox oil temperature high.
One or a combination of the following: transmission oil temperature
high, oil pressure low.
Failed system.
Change 2 2-83
TM 1-1520-238-10
Table 2-5. CPG Caution/Warning Light Segments - continued
Word Segment
ROCKET4
ELEC SYS FAIL
BUCS ON
MISSILE
TADS
PRI HYD
MAN STAB
TEMP INT
UTIL HYD
ENG ANTI ICE
VOICE CIPHER
CHIPS MAIN XMSN
FUEL LOW FWD
FUEL LOW AFT
ASE
ENG 2
MAIN XMSN 2
PRI MUX
VIB GRBX
TEMP TR
2-84 Change 2
Color
AMBER
RED
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
AMBER
Illumination Parameter or Fault
Failed system.
Complete dc electrical system failure. The battery is powering the dc
emergency bus.
Backup control system is activated in at least one control axis.
Failed system.
Failed system.
Primary system hydraulic oil pressure is below 1250 psi.
　
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