Removal of the Servo Fuel Heater (SFH) [CFML]

TASK 73-11-20-000-802-A
Removal of the Servo Fuel Heater (SFH)

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)
No specific	AR	CAP - PROTECTION
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-803-A	Draining of the Lubrication Unit
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 73-11-05-000-801-A	Removal of the Main Fuel Pump
Servo Fuel Heater (SFH)

3. Job Set-up
Subtask 73-11-20-941-054-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) Put WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-11-20-010-056-A

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 73-11-20-020-052-A

A. Removal of the Servo Fuel Heater (SFH) (1):
(1) Put a CONTAINER 5 L (1.32 USGAL) below the SFH (1).
(2) Drain the oil from the lube unit (Ref. AMM TASK 12-13-79-610-803).
(3) Disconnection of the oil tube (3) from the SFH (1):
(a) Remove the four bolts (4) from the oil tube (3).
(b) Disconnect the oil tube (3) from the SFH (1).
(c) Remove and discard the gasket (5).
(4) Disconnection of the oil tube (6) from the SFH (1):
(a) Remove the four bolts (7) from the oil tube (6).
(b) Disconnect the oil tube (6) from the SFH (1).
(c) Remove and discard the gasket (8).
(5) Drain the main fuel pump (Ref. AMM TASK 73-11-05-000-801).
(6) Disconnection of the fuel tube (9) from the SFH (1):
(a) Remove the four bolts (10) from the fuel tube (9).
(b) Disconnect the fuel tube (9) from the SFH (1).
(c) Remove and discard the gasket (11).
(7) Disconnection of the fuel tube (12) from the SFH (1):
(a) Remove the four bolts (13) from the fuel tube (12).
(b) Disconnect the fuel tube (12) from the SFH (1).
(c) Remove and discard the gasket (14).
(8) Removal of the SFH (1):
(a) Remove the four bolts (15) and the four washers (16) that attach the SFH (1) to the four mounting brackets (17).
(b) Remove the SFH (1) from the four mounting brackets (17).
(9) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

[Rev.10 from 2021] 2026.04.01 13:06:53 UTC