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MD-80 AIRCRAFT MAINTENANCE MANUAL
3. Removal/Installation Right Engine Dual Unit Ignition Exciter A. Remove Dual Unit Exciter (Figure 401) (1) Tag throttle/thrust reverser levers. WARNING: IGNITION SYSTEM VOLTAGE IS DANGEROUSLY HIGH. IGNITION SWITCH MUST BE IN "OFF" POSITION BEFORE REMOVAL OF ANY IGNITION COMPONENTS. ALLOW SEVERAL MINUTES TO ELAPSE BETWEEN OPERATION OF IGNITION SYSTEM ANDREMOVAL OF IGNITION COMPONENTS. IMMEDIATELY UPON DETACHING IGNITER CABLE FROM IGNITER PLUG, DISCHARGE CURRENT BY GROUNDING IGNITER CABLE TERMINAL TO ENSURE COMPLETE DISSIPATION OF ENERGY FROM IGNITION SYSTEM. FAILURE TO FOLLOW THIS PROCEDURE COULD RESULT IN SEVERE INJURY TO PERSONNEL. WARNING: MAKE CERTAIN CIRCUIT BREAKERS ARE OPEN BEFORE ATTEMPTING MAINTENANCE PROCEDURES. INADVERTENT ENGINE START ORREVERSER OPERATION COULD RESULT IN DEATH OR SERIOUS INJURY TO PERSONNEL. WARNING: TAG AND USE SAFETY CLIPS TO SAFETY THE CIRCUIT BREAKERS. IF THE CIRCUIT BREAKERS ARE NOT OPENED, TAGGED, AND SAFETIED, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR. (2) Open these circuit breakers and install safety tags: LOWER EPC, DC TRANSFER BUS Row Col Number Name U 40 B1-40 ENGINE START PUMP U 41 B1-2ENGINE IGNITION RIGHT UPPER EPC, ENGINE - RIGHT AC BUS Row Col Number Name XA 871 L 24 B1-4 RIGHT CONT IGNITION XA 870 L 26 B1-4 RIGHT CONT IGNITION XA 872-875 L 26 B1-425 RIGHT ENGINE IGNITION XA 870-875 (3) Open access door (5902C) for right engine. WARNING: MAKE CERTAIN THAT THRUST REVERSER HYDRAULIC SYSTEM HAS DEPRESSURIZED BY CHECKING THRUST REVERSER ACCUMULATOR PRESSURE GAGE AFTER CONTROL VALVEARM HAS BEEN LOCKPINNED IN DUMP POSITION. GAGE SHOULD READ 950 TO 1050 PSI (6550 TO 7239 KPA) (PRECHARGE PRESSURE). (4) Place thrust reverser control valve in dump position and install lockpin. (PAGEBLOCK 78-00-00/201) WARNING: EXERCISE CARE TO AVOID STRAKES WHEN WORKING IN ENGINE AREA WITH COWL DOORS OPEN OR INJURY TO PERSONNEL COULD RESULT. (5) Open engine lower cowl door.

EFFECTIVITY
XA870-875

74-10-02
TP-80MM-XA
BOEING PROPRIETARY - Copyright # Unpublished Work - See title page for details

Page 403 Aug 01/2006

MD-80 AIRCRAFT MAINTENANCE MANUAL
CAUTION: TO PREVENT DAMAGE TO ELECTRICAL CONNECTORS, DO NOT USE ANY TOOL OTHER THAN PLUG PLIERS TO DISCONNECT PLUGS. (6) Disconnect (input) electrical connectors from the two exciter units. Install protective caps on connectorsand mating receptacle on exciters. (7) Disconnect (output) ignition lead coupling nuts from exciter. Install protective caps on coupling nuts and mating connectors on exciter. (8) Remove bolts and washers securing exciter to support, spread front and rear support and remove exciter, input (rear) end first. (9) Remove bolts and nuts that attach the two exciter units and remove one unit from theother. B. Install Dual Unit Exciter (Figure 401) (1) Make certain throttle/thrust reverser lever is tagged. WARNING: MAKE CERTAIN CIRCUIT BREAKERS ARE OPEN BEFORE ATTEMPTING MAINTENANCE PROCEDURES. INADVERTENT ENGINE START OR REVERSER OPERATION COULD RESULT IN DEATH OR SERIOUS INJURY TO PERSONNEL. WARNING: TAG AND USE SAFETY CLIPS TO SAFETY THE CIRCUIT BREAKERS. IF THE CIRCUIT BREAKERS ARE NOT OPENED,TAGGED, AND SAFETIED, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR. (2) Make sure that these circuit breakers are open and have safety tags: LOWER EPC, DC TRANSFER BUS Row Col Number Name U 40 B1-40 ENGINE START PUMP U 41 B1-2 ENGINE IGNITION RIGHT UPPER EPC, ENGINE - RIGHT AC BUS Row Col Number Name XA 871 L 24 B1-4 RIGHT CONT IGNITION XA 870 L 26 B1-4 RIGHT CONT IGNITION XA 872-875 L 26B1-425 RIGHT ENGINE IGNITION XA 870-875 WARNING: MAKE CERTAIN THAT THRUST REVERSER HYDRAULIC SYSTEM HAS DEPRESSURIZED BY CHECKING THRUST REVERSER ACCUMULATOR PRESSURE GAGE AFTER CONTROL VALVE ARM HAS BEEN LOCKPINNED IN DUMP POSITION. GAGE SHOULD READ 950 TO 1050 PSI (6550 TO 7239 KPA) (PRECHARGE PRESSURE). (3) Make certain thrust reverser control valve is in dump position and lockpin is...
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