Installation of the Main Heat Exchanger [CFML]

TASK 79-21-25-400-801-A
Installation of the Main Heat Exchanger

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 74.55 and 67.45 lbf.in (0.84 and 0.76 m.daN )
No specific	Torque wrench: range to between 120.75 and 109.25 lbf.in (1.36 and 1.23 m.daN )
No specific	Torque wrench: range to between 310 and 270 lbf.in (3.50 and 3.05 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	GASKET	EIPC 79-21-25-01-020
7	GASKET	EIPC 79-21-25-01-040
10	GASKET	EIPC 79-21-25-01-060
13	GASKET	EIPC 79-21-25-01-080

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-805-A	Check of the Oil Level and Replenishing
TASK 71-00-00-710-815-A	Idle Leak Check
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
Main Heat Exchanger

3. Job Set-up
Subtask 79-21-25-941-051-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 79-21-25-010-051-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position.

4. Procedure

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

Subtask 79-21-25-420-050-A

A. Installation of the Main Heat Exchanger
(1) Put a CONTAINER 5 L (1.32 USGAL) below the main heat exchanger (1).
(2) Remove all the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.
(3) Make sure that the mating surfaces are clean and clear of unwanted materials.
(4) Lubricate the threads of the following items with engine oil (Material No.CP2442) :

The four bolts (3)
The four bolts (6)
The four bolts (9)
The four bolts (12)
The four bolts (16)
The coupling nut (15)
The new EIPC 79-21-25-01-020 GASKET (4)
The new EIPC 79-21-25-01-040 GASKET (7)
The new EIPC 79-21-25-01-060 GASKET (10)
The new EIPC 79-21-25-01-080 GASKET (13).

(5) Install the main heat exchanger (1) in the correct position on the three mounting brackets (18).
(6) Install the four bolts (16) equipped with the captive washers to attach the main heat exchanger (1) on the three mounting brackets (18).
(7) TORQUE the four bolts (16) to between 74.55 and 67.45 lbf.in (0.84 and 0.76 m.daN )

.
(8) Connection of the oil tubes to the main heat exchanger (1):
(a) Install the oil tube (14) in the correct position on the main heat exchanger (1).
(b) TORQUE the coupling nut (15) to attach the oil tube (14) on the main heat exchanger (1) to between 310 and 270 lbf.in (3.50 and 3.05 m.daN )

.
(c) Install the new gasket (13) and the oil tube (11) in the correct position on the main heat exchanger (1).
(d) Install the four bolts (12) to attach the oil tube (11) to the main heat exchanger (1), and tighten them with your hand.
(e) TORQUE the four bolts (12) to between 120.75 and 109.25 lbf.in (1.36 and 1.23 m.daN )

.
(f) Install the new gasket (10) and the oil tube (8) in the correct position on the main heat exchanger (1).
(g) Install the four bolts (9) to attach the oil tube (8) to the main heat exchanger (1) and tighten them with your hand.
(h) TORQUE the four bolts (9) to between 120.75 and 109.25 lbf.in (1.36 and 1.23 m.daN )

.
(9) Connection of the fuel tubes to the main heat exchanger (1):
(a) Install the new gasket (7) and the fuel tube (5) in the correct position on the main heat exchanger (1).
(b) Install the four bolts (6) to attach the fuel tube (5) to the main heat exchanger (1), and tighten them with your hand.
(c) TORQUE the four bolts (6) to between 120.75 and 109.25 lbf.in (1.36 and 1.23 m.daN )

.
(d) Install the new gasket (4) and the fuel tube (2) in the correct position on the main heat exchanger (1).
(e) Install the four bolts (3) to attach the fuel tube (2) to the main heat exchanger (1), and tighten them with your hand.
(f) TORQUE the four bolts (3) to between 120.75 and 109.25 lbf.in (1.36 and 1.23 m.daN )

.
(10) Remove the CONTAINER 5 L (1.32 USGAL) from below the main heat exchanger (1).

Subtask 79-21-25-612-050-A

B. Check of the Oil Level
(1) Do a check of the oil level and replenish, if necessary (Ref. AMM TASK 12-13-79-610-805).

Subtask 79-21-25-710-050-A

C. Test
(1) Do the idle leak check (Ref. AMM TASK 71-00-00-710-815).

5. Close-up
Subtask 79-21-25-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:06:54 UTC