TM 1-1520-238-10 Change 2 2-80.1/(2-80.2 blank) Table 2-4. Pilot Caution/Warning Light Segments Word Segment Color Illumination Parameter or Fault IFF RED Mode 4 is not able to respond to interrogation. ENG ICE AMBER Ice detector probe indicates icing conditions are present. BUCS ON AMBER Backup control system is activated in at least one control axis. CHIPS ENG 1 AMBER No. 1 engine scavenge oil contains metal fragments. OIL PSI ENG 1 AMBER No. 1 oil pressure is below 25 psi. OIL BYP ENG 1 AMBER No. 1 engine oil filter is clogged, and bypass has begun. FUEL BYP ENG 1 AMBER No. 1 engine fuel filter is clogged, and bypass has begun. FUEL PSI ENG 1 RED No. 1 engine fuel pressure is less than 9 psi. AMBER Spare. ROCKET AMBER Failed system. MISSILE AMBER Failed system. RTR BK AMBER Hydraulic pressure is being sensed at the rotor brake by the in-line pressure switch. MAN STAB AMBER Automatic operation of the stabilator control unit has failed, or manual control has been selected. CHIPS NOSE GRBX 1 AMBER No. 1 engine nose gearbox oil contains metal fragments. OIL PSI NOSE GRBX 1 AMBER No. 1 engine nose gearbox oil pressure is below 26 – 30 psi. OIL HOT NOSE GRBX 1 AMBER No. 1 engine nose gearbox oil temperature is above 274 – 294 F (135 – 145 C). BLADE ANTI ICE FAIL AMBER Failed system. CANOPY ANTI ICE FAIL AMBER Failed system or canopy temperature has exceeded limits. ENG 1 ANTI ICE AMBER No. 1 engine nose gearbox heater and engine inlet temperature sensors are not at operating temperature. After reaching operating temperature, indicates No. 1 engine anti-ice subsystem has failed. ENG 2 ANTI ICE AMBER No. 2 engine nose gearbox heater and engine inlet temperature sensors are not at operating temperature. After reaching operating temperature, indicates No. 2 engine anti-ice subsystem has failed. GUN AMBER Failed system. TADS AMBER Failed system. PNVS AMBER Failed system.