T M    5 5 - 1 5 2 0 - 2 4 0 - T 4-6.4   ENGINE   NO.   1   TRIM   CIRCUIT   BREAKER   WILL   NOT   STAY   CLOSED ( C o n t i n u e d ) 4-6.4 NO DID    CIRCUIT    BREAKER    OPEN WHEN   ENGINE   TRIM   SWITCH IS   SET   TO    RPM   INC? DID    CIRCUIT    BREAKER    OPEN BEFORE    ENGINE    TRIM    SWITCH WAS SET  TO   INC    OR   DEC? YES REMOVE     COPILOT’S     FLOOR PANEL    DISCONNECT    WIRE W645-304-22   FROM   TERM   3 TB18.    CHECK    FOR    GROUND    ON WIRE     W645-304-22     IS GROUND PRESENT? LOCATE   GROUND   FAULT BETWEEN     CB103CB2     AND TB18   ON   WIRE   W550-177-22 OR    W645-3D4-22.    REPAIR    OR REPLACE    WIRE    AS    REQUIRED. YES NO REMOVE     PILOT’S     FLOOR PANEL.   DISCONNECT   PILOT’S THRUST    GRIP    PLUG.    CHECK FOR    GROUND    ON    TB18    TERM 13.    IS    GROUND    PRESENT? CHECK    FOR    GROUND    ON REMAINING    WIRES    ON    TB18 TERM    3.    IS    GROUND    PRESENT? NO R E P A I R     OR    REPLACE   PILOT’S THRUST   GRIP NO REPLACE   ENGINE   NO.   1 TRIM   CIRCUIT     BREAKER. YES LOCATE   GROUND   FAULT BETWEEN    103K2,    300J26,    AND 300J21   ON   WIRES   W696-49. LOCATE    GROUND    FAULT    ON WIRE    W591-67-22    BETWEEN PLUG    103P1    AND    RELAY 103K2.    REPAIR    OR    REPLACE WIRE    AS    REQUIRED. OPEN   RIGHT   ELECTRICAL COMPARTMENT.   REMOVE WIRE    FROM    RELAY    103K2 DISCONNECT     COPILOT’S THRUST   GRIP   PLUG   CHECK FOR    GROUND    ON    TB18    TERM 3.    IS    GROUND    PRESENT? REPAIR    OR    REPLACE    CO- PILOT’   S   THRUST   GRIP. 22    OR    w696-4422    OR    w639- 325-22   OR   W592-28-22. TERM    X1.    IS    GROUND    PRESENT ON    WIRE? REPAIR   OR   REPLACE   WIRE   AS REQUIRED DISCONNECT    PLUG    103P1    AT NO   1   ENGINE   CONTROL   BOX. YES CHECK    FOR    GROUND    ON    PLUG 103P1    PIN    B.    IS    GROUND PRESENT? NO 22,OR W5592-52-22 BETWEEN DISCONNECT   WIRE   FROM RELAY   103K2   TERM   A2.   CHECK FOR    GROUND    ON    WIRE    IS GROUND    PRESENT? LOCATE    GROUND    FAULT    ON WIRE W645-315-22, W591-24- REMOVE     PILOT’S     FLOOR PANEL.    DISCONNECT    PILOTS THRUST    GRIP    PLUG.    CHECK FOR    GROUND    ON    TB18    TERM 3.    IS    GROUND    PRESENT? R E L A Y S     1 0 3 K 1 , 1 0 3 K 3     A ND CHECK    FOR    GROUND    ON RELAY    103K2    TERM    X1.    IS GROUND PRESENT? DISCONNECT WIRE W645-315. 22   FROM   TB18   TERM   3.   CHECK FOR    GROUND    ON    WIRE    W645- 315-22.    IS    GROUND    PRESENT? YES TBIB   REPAIR   OR   REPLACE WIRES AS REQUIRED NO YES NO NO REPAIR    OR    REPLACE    PILOT’S THRUST    GRIP. LOCATE    GROUND    FAULT    ON WIRE   W696-50-22   OR   W696- 45-22    BETWEEN    TB18    AND RECEPTACLES    300J25    AND 300J26.   REPAIR   OR   REPLACE WIRE   AS   REQUIRED GO  TO  NEXT  PAGE Change   1 4-125