Installation of the Main Oil/Fuel Heat Exchanger [CFMI]

TASK 79-21-20-400-001-A
Installation of the Main Oil/Fuel Heat Exchanger

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )
No specific	Torque wrench: range to between 140 and 125 lbf.in (1.58 and 1.41 m.daN )
No specific	Torque wrench: range to between 550 and 450 lbf.in (6.22 and 5.09 m.daN )
No specific	Torque wrench: range to between 0.17 and 0.023 m.daN (15.04 and 2.04 lbf.in )
No specific	Torque wrench: range to between 0.50 and 0.45 m.daN (44.25 and 39.82 lbf.in )
No specific	Torque wrench: range to between 0.67 and 0.473 m.daN (59.29 and 41.86 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 73-11-20-400-001-A	Installation of the Servo Fuel Heater
TASK 79-21-20-600-001-A	Preserving of the Oil/Fuel Heat Exchanger
Main Oil/Fuel Heat Exchanger

3. Job Set-up
Subtask 79-21-20-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 79-21-20-865-056-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25
FOR FIN: 1000EM2 (ENGINE2)
49VU	FUEL/LP VALVE/MOT1/ENG2	2QG	A09
121VU	FUEL/LP VALVE/MOT2/ENG2	4QG	M26

Subtask 79-21-20-010-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowls are open: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 79-21-20-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the main oil/fuel heat exchanger (60)
(1) Remove the blanking caps and plugs.

NOTE: If the main oil/fuel heat exchanger (60) is in preservation condition , do the depreservation procedure (Ref. AMM TASK 79-21-20-600-001).

(2) Make sure that the gaskets (110) and (160) are serviceable.
(3) Make sure that all the mating faces are clean.
(4) Lubricate the gasket (110) with engine oil (Material No.CP2442) . Install the gasket (110) on the fuel pump (80) mating face.
(5) Lubricate the threads of the fuel pump mounting studs with graphite grease (Material No.CP2101) .
(6) Install the main oil/fuel heat exchanger (60) on the fuel pump housing.
(7) Install the washers (120) and nuts (130) to attach the main oil/fuel heat exchanger (60) to the fuel pump (80).
(8) TORQUE the nuts (130) to between 140 and 125 lbf.in (1.58 and 1.41 m.daN )

.
(9) Lubricate the threads of the (main oil/fuel heat exchanger) drain nipple (140) with engine oil (Material No.CP2442) . Connect the drain tube (90) to the drain nipple (140). Tighten by hand.

PRE SB 72-0693 and SB 79-0035

(10) Connect the FUEL IN tube (40) to the main oil/fuel heat exchanger (60) and to the fuel hose (200) as follows :
(a) Make sure that the mating faces are clean.
(b) Lubricate the gasket (160) with engine oil (Material No.CP2442) .
(c) Lubricate the threads of the bolts (180) with graphite grease (Material No.CP2101) .
(d) Install the gasket (160) in sandwich between the tube (40) and the exchanger (60). Put the bracket at its correct position above the square flange of the tube (40) and install the bolts (180) to attach the tube (40) to the exchanger (60).
(e) Tighten the bolts (180) as follows:

NOTE: You must apply the following steps to each of the 4 bolts (180). Start by the first bolt on the top left side of the port, followed by the second bolt at the diagonally opposite location, the third bolt on the bottom left side of the port and the fourth bolt at the diagonally opposite location.

1 TORQUE the bolts (180) to between 0.50 and 0.45 m.daN (44.25 and 39.82 lbf.in )

.
2 Unscrew the bolts (180) but do not remove them.
3 Mesure the LOCKING TORQUE of each bolt (180). This TORQUE must be to between 0.17 and 0.023 m.daN (15.04 and 2.04 lbf.in )

; if not, replace the bolt.
4 TORQUE the bolts (180) again to between 0.50 and 0.45 m.daN (44.25 and 39.82 lbf.in )

.
5 Add the LOCKING TORQUE value of the bolts (180) recorded before.
6 FINAL TORQUE the bolts (180) to between 0.67 and 0.473 m.daN (59.29 and 41.86 lbf.in )

.
(f) Connect the other end of the tube (40) to the fuel hose (200). Tighten the coupling nut (10) by hand.

POST SB 72-0693 and SB 79-0035

(11) Connect the FUEL IN tube (40) to the main oil/fuel heat exchanger (60) and to the fuel hose (200) as follows :
(a) Make sure that the mating faces are clean.
(b) Lubricate the gasket (160) with engine oil (Material No.CP2442) .
(c) Lubricate the threads of the bolts (185) with graphite grease (Material No.CP2101) .

NOTE: Make sure that the bolts (185) removed are serviceable, to correctly attach the FUEL IN tube (40) in the port.

(d) Install the gasket (160) in sandwich between the tube (40) and the exchanger (60). Put the bracket at its correct position above the square flange of the tube (40) and install the bolts (185) to attach the tube (40) to the exchanger (60).
(e) Tighten the bolts (185) as follows:

NOTE: You must apply the following steps to each of the 4 bolts (185). Start by the first bolt on the top left side of the port, followed by the second bolt at the diagonally opposite location, the third bolt on the bottom left side of the portand the fourth bolt at the diagonally opposite location.

1 TORQUE the bolts (185) to between 0.50 and 0.45 m.daN (44.25 and 39.82 lbf.in )

.
2 Unscrew the bolts (185) but do not remove them.
3 Mesure the LOCKING TORQUE of each bolt (185). This TORQUE must be to between 0.17 and 0.023 m.daN (15.04 and 2.04 lbf.in )

; if not, replace the bolt.
4 TORQUE the bolts (185) again to between 0.50 and 0.45 m.daN (44.25 and 39.82 lbf.in )

.
5 Add the LOCKING TORQUE value of the bolts (185) recorded before.
6 FINAL TORQUE the bolts (185) to between 0.67 and 0.473 m.daN (59.29 and 41.86 lbf.in )

.
(f) Connect the other end of the tube (40) to the fuel hose (200). Tighten the coupling nut (10) by hand.

END SB 72-0693 and SB 79-0035

(12) Connect the fuel tube (50) to the fuel pump nipple (250) and to the fuel tube to FRV (270). Tighten the coupling nuts (260) and (230) by hand.
(13) Attach the FUEL IN tube (40) and the fuel tube (50) to the bracket (20) as follows:
(a) Put the plastic bushing (190) and clamp (30) in their correct position and in line with the lower side of the bracket (20), this for tube (40).
(b) Put the plastic bushing (240) and clamp (150) in their correct position and in line with the upper side of the bracket (20), this for tube (50).
(c) Engage the bolt (210) from the lower side of the bracket (20) and attach the 3 clamps (30), (150) and a third clamp (which shares the same attachment) with the nut (220). TORQUE the nut (220) to between 55 and 50 lbf.in (0.62 and 0.57 m.daN )

.
(14) TORQUE the coupling nuts.

CAUTION: USE TWO 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 PREVENTS DAMAGE TO THE PARTS.

(a) TORQUE the coupling nuts (90), (10), (260) and (230) to between 550 and 450 lbf.in (6.22 and 5.09 m.daN )

Subtask 79-21-20-410-051-A ** ON A/C NOT FOR ALL

B. Install servo fuel heater (Ref. AMM TASK 73-11-20-400-001).

Subtask 79-21-20-865-057-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25
FOR FIN: 1000EM2 (ENGINE2)
49VU	FUEL/LP VALVE/MOT1/ENG2	2QG	A09
121VU	FUEL/LP VALVE/MOT2/ENG2	4QG	M26

Subtask 79-21-20-710-050-A ** ON A/C NOT FOR ALL

D. Do a minimum idle check and make sure that there is no leak (Ref. AMM TASK 71-00-00-710-006).

5. Close-up
Subtask 79-21-20-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

Subtask 79-21-20-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 04:33:01 UTC