TM 1-1520-253-10

LEGEND  ILLUMINATING PARAMETER OR FAULT 
CAUTION LEGENDS 
#1 FUEL LOW  Flashes when left fuel tank level is about 172 pounds. 
#1 FUEL PRESS  Left engine fuel pressure between engine-driven low-pressure fuel pump and high-
pressure fuel pump is low. 
#1 ENG OIL PRESS  Left engine oil pressure is too low for continued operation. 
#1 ENGINE OIL TEMP  Left engine oil temperature is above 150°C. 
CHIP #1 ENGINE  Left engine chip detector in scavenge oil system has metal chip or particle buildup. 
#1 FUEL FLTR BYPAS  Left engine fuel .lter has excessive pressure differential across .lter. 
#1 ENGINE STARTER  Left engine start circuit is actuated. 
#1 PRI SERVO PRESS  First stage pressure is shut off, or has dropped below minimum, or servo pilot valve is 
jammed. 
TAIL RTR  Goes on when a tail rotor cable is broken or disconnected. 
QUADRANT 
MAIN XMSN OIL TEMP  Main transmission oil temperature is above 120°C. 

AB0714
SA

AB0836
SA

Figure 2-23. CDU Caution/Advisory Grid Table 2-3. Caution/Advisory and Warning Light Lighting Parameters (Cont)
LEGEND ILLUMINATING PARAMETER OR FAULT
BOOST SERVO OFF LFT PITOT HEAT CHIP INPUT MDL-LH CHIP ACCESS MDL-LH MR DE-ICE FAIL MAIN XMSN OIL PRES #1 GEN #1 GEN BRG #1 CONV AC ESS BUS OFF BATT LOW CHARGE GUST LOCK #1 OIL FLTR BYPASS #1 HYD PUMP IRCM INOP
INT XMSN OIL TEMP STABILATOR FLT-PATH STAB CHIP INT XMSN CHIP MAIN MDL SUMP MR DE-ICE FAULT
#1 RSVR LOW #2 GEN #2 GEN BRG #2 CONV DC ESS BUS OFF BATTERY FAULT PITCH BIAS FAIL #2 OIL FLTR BYPASS #2 HYD PUMP

AUX FUEL
Indicates loss of second stage hydraulic pressure to the boost servo, or a boost servo jam.
Indicates left pitot heater element is not receiving power with PITOT HEAT switch ON.
Indicates a metal particle has been detected by the chip detector.
Indicates a metal particle has been detected by the chip detector.
Indicates a short or open in the main rotor deice system, which will disable the system.
Main transmission oil pressure is below about 14 psi.
Left generator is not supplying power to the buses.
Generator main bearing is worn or has failed.
Left converter (ac to dc current) has no output.
Indicates that no power (115 vac, phase B) is being supplied to the ac essential bus.
Indicates that the battery charge state is at or below about 40% of full charge state.
Indicates the gust lock is not fully disengaged.
Left engine oil .lter pressure differential is excessive.
Left hydraulic pump output pressure below minimum.
Indicates a malfunction has been detected by the infrared countermeasure system or

infrared countermeasure system is in a cooldown cycle.
Intermediate gear box oil temperature is excessive.
Stabilator system is turned on but is in the manual mode.
Indicates that FPS is inoperative in one or more axis.
Indicates a metal particle has been detected by the chip detector.
Indicates a metal particle has been detected by the chip detector.
Indicates partial failure of the blade deice system. Uneven shedding of ice can be ex-
pected.
Hydraulic .uid level has dropped below about 60% of full capacity.
Right generator is not supplying power to the buses.
Generator main bearing is worn or has failed.
Right converter (ac to dc current) has no output.
Indicates that no power is being supplied to the dc essential bus.
(No longer used)
(No longer used)
Right engine oil .lter pressure differential is excessive.
Right hydraulic pump output pressure below minimum.
Indicates one or more auxiliary fuel tanks are empty and/or a degraded mode of system
　
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