C. Referenced Information
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REFERENCE DESIGNATION
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79-21-20-000-002 Removal of the Main Oil/Fuel Heat Exchanger
3. Job Set-up
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Subtask 79-21-20-010-055
A. Remove the main oil/fuel main heat exchanger from the engine (Ref. TASK 79-21-20-000-002).
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4. Procedure
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Subtask 79-21-20-620-050
A. Preservation of the main oil/fuel heat exchanger.
R (1) Put lube system corrosion preventive oil (Material No. CP5067) in the oil and fuel circuits of the main oil/fuel heat exchanger. NOTE : This oil contains a corrosion inhibitor.
____
(2) Install blanking caps and blanking plugs on all the open orifices.
(3) Turn and shake the unit for approximately one minute.
Subtask 79-21-20-630-050
B. Depreservation of the main oil/fuel heat exchanger.
(1) Put a container minimum capacity 2 l (0.5 USgal) under the main oil/fuel heat exchanger.
(2) Remove all blanking caps and plugs.
(3) Fully drain the oil and the fuel circuits.
(4) Install blanking caps and plugs if the unit is not re-installed on the engine immediately after the depreservation.
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MAIN OIL/FUEL HEAT EXCHANGER - REMOVAL/INSTALLATION
___________________________________________________ TASK 79-21-20-000-002 Removal of the Main Oil/Fuel Heat Exchanger
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific container 1 USgal (4 L) No specific warning notice
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
26-12-15-000-042 Removal of the Fan Fire Detectors (4000WD1,4000WD2) 71-13-00-010-040 Opening of the Fan Cowl Doors 73-11-20-000-002 Removal of the Servo Fuel Heater 79-21-20-620-002 Preservation/Depreservation of the Main Oil/Fuel Heat
Exchanger 79-21-20-991-300 Fig. 401
3. Job Set-up
__________ Subtask 79-21-20-941-053
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
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(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 79-21-20-010-056
B. Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
Subtask 79-21-20-010-057
C. Get Access
(1) Remove the fan zone fire detector, loops A and B (Ref. TASK 26-12-15-000-042).
R (2) Put a container 1 USgal (4 L) below the main oil/fuel heat exchanger.
4. Procedure
_________
(Ref. Fig. 401/TASK 79-21-20-991-300)
Subtask 79-21-20-020-051
A. Removal of the main oil/fuel heat exchanger.
CAUTION : USE 2 WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS.
_______ ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.
(1) Remove the servo-fuel heater (70) (Ref. TASK 73-11-20-000-002).
R (2) Remove the FUEL-IN tube (40) from the main oil/fuel heat exchanger R (60) and from the fuel hose (200) as follows: R R PRE CFM SB 72-0515 and CFM SB 79-0022 R
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