TM 1–1520–238–T–2 2–108 Change 7 Table 2–1. Master Failure Symptom Index (cont) Failure Symptom MOC Reference LOW RPM ROTOR INDICATOR REMAINS LIGHTED ABOVE 93% N_R (PILOT ENG–RTR RPM% INDICATOR : N_P BETWEEN 80% TO 85%) TM 1–1520–238–T–4 DRIVE SYSTEM VIBRATION LOW RPM ROTOR INDICATORS ARE NOT LIGHTED (MASTER CAUTION/WARNING PANELS: PRESS TO TEST INDICATOR PRESSED) TM 1–1520–238–T–4 DRIVE SYSTEM INDICATORS LSR DET CIRCUIT BREAKER (CB96) – DOES NOT STAY CLOSED OR 28 VDC IS NOT PRESENT AT (A76) J1–AA TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 2 – PILOT STATION) LT ANTI COL CIRCUIT BREAKER (CB40) DOES NOT STAY CLOSED (EXTERNAL ELECTRICAL POWER APPLIED) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (AC ESSENTIAL BUS 1 – PILOT STATION) LT CAUT CIRCUIT BREAKER (CB21) DOES NOT STAY CLOSED (PILOT ELEC PWR PANEL: BATT/EXT PWR SWITCH SET TO EXT PWR) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (DC EMERGENCY BUS – PILOT STATION) LT CAUT CIRCUIT BREAKER DOES NOT STAY CLOSED TM 1–1520–238–T–7 STABILATOR LT CAUT CIRCUIT BREAKER DOES NOT STAY CLOSED TM 9–1090–208–23–2 AERIAL ROCKET CONTROL SYSTEM LT FORM CIRCUIT BREAKER (CB90) DOES NOT STAY CLOSED (PILOT ELEC PWR PANEL: BATT/EXT PWR SWITCH SET TO EXT PWR) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (AC ESSENTIAL BUS 1 – PILOT STATION) LT NAV CIRCUIT BREAKER (CB73) DOES NOT STAY CLOSED (PILOT ELEC PWR PANEL: BATT/EXT PWR SWITCH SET TO EXT PWR) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 2 – PILOT STATION) LT PRI CIRCUIT BREAKER (CB39) DOES NOT STAY CLOSED (PILOT ELEC PWR PANEL: BATT/EXT PWR SWITCH SET TO EXT PWR) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (AC ESSENTIAL BUS 1 – PILOT STATION)