73-21-00
 ALL  ú ú C13 Page 558 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MAIN ENGINE CONTROL - REMOVAL/INSTALLATION
__________________________________________
 1.  General
_______
 A.  This procedure gives the removal and installation tasks for the main engine control (MEC).
 B.  The MEC is installed on the fan case.
 C.  It is necessary to remove the servo fuel heater to get access to the MEC mounting nuts.
 NOTE: You can use the procedure in AMM 73-11-01/401 to remove the fuel
____ pump, the MEC, the heat exchanger of the main oil/fuel and the servo fuel heater as one assembly. After the removal of this assembly, you can remove the attached components and the fittings.
 D.  The fuel pump package weighs approximately 108 pounds (48.8 kilograms). When you remove the individual components, they have the approximate weights as follows:
 Component  Weight
_________ MEC 57 pounds (26 kilograms) Main Oil/Fuel Heat Exchanger 10 pounds (4.5 kilograms) Servo Fuel Heater 5 pounds (2.3 kilograms) Fuel Pump 36 pounds (16 kilograms)
 TASK 73-21-01-004-001-C00
 2.  Main Engine Control (MEC) Removal
_________________________________
 A.  Equipment
 (1)  
Container - 5 gallon (20 liter) capacity,
 for fuel and oil

 (2)  
Wrench Set - MEC/Fuel Pump Nuts Run On/Off, 856A1469G02, CFMI. Optional to 856A1303G01.

 (3)  
Tool - MEC/Fuel Pump Nuts Removal, 856A1303G01, CFMI. Optional to 856A1469G02.

 B.  Consumable Materials
 (1)  
Grease - Graphite (CP2101) (AMM 70-10-01/201).

 (2)  
Oil - Lubricating, MIL-L-6081 Grade 1010
 (CP2369), local purchase

 (3)  
Petrolatum - Pure Mineral (CP2102),
 local purchase

 C.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 70-30-01/201, Seals and Gaskets

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 73-21-01
 ALL  ú ú C01 Page 401 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(3)  
AMM 71-11-02/201, Fan Cowl Panels

 (4)  
AMM 73-00-00/201, Engine Fuel and Control

 (5)  
AMM 76-11-08/401, Main Engine Control Fuel Control Box

 (6)  
AMM 78-31-00/201, Thrust Reverser System

 D. Access
 (1)  Location Zones
 101 Flight Compartment, Left
 102 Flight Compartment, Right
 502/602 Fan Cowl Panels, Left
 504/604 Thrust Reversers, Left
 506 No. 1 Engine
 606 No. 2 Engine

 E. Prepare to Remove the MEC
 S 864-002-C00
 (1)  Supply electrical power (AMM 24-22-00/201).
 (a)  Remove the DO-NOT-OPERATE tag from the BAT switch.
 S 864-003-C00
 (2)  
Make sure the engine start lever is in the CUTOFF position.

 S 864-009-C00

 (3)  
Make sure the FUEL VALVE CLOSED (engine fuel shutoff valve) light on the fuel control panel (P5 overhead panel) is dim.

 S 864-005-C00

 (4)
Install a DO-NOT-OPERATE tag on the applicable engine start lever.

 NOTE: The position light for the engine fuel shutoff valve has
____
 three positions:

 -bright when the valve is in transition
 -dim when the valve is closed - off when the valve is open.
 S 864-006-C00
 (5)  
Remove the electrical power (AMM 24-22-00/201).

 (a)  Set the BAT switch on the Electrical Meters Battery and Galley Power Module (P5-13) to the OFF position and install a DO-NOT-OPERATE tag.

 (6)  
Open the left fan cowl panel (AMM 71-11-02/201).

 S 014-007-C00
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