W DOC AIRBUS | AMM A320F

Draining of the Main Heat Exchanger [CFML]

TASK 79-21-25-680-801-A
Draining 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.
ZONE: 400
1. Reason for the Job
Protect the engine for the Draining of the Main Fuel Heat Exchanger.
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
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 97.65 and 88.35 lbf.in (1.10 and 1.00 m.daN ) T
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-13-79-610-807-A
Flushing of the Oil System
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
F Main Heat Exchanger
3. Job Set-up
Subtask 79-21-25-941-052-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 a WARNING NOTICE(S) in position to tell persons not to operate:
  • The ENG/MODE selector switch
  • 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 79-21-25-010-052-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)-ADJUSTABLE in position.
4. Procedure
WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.
Subtask 79-21-25-680-050-A
A. Drain the main heat exchanger (1) as follows:
F Main Heat Exchanger
   (1) Remove the cap assembly (2).
   (2) Allow the main heat exchanger (1) to drain.
   (3) Install the cap assembly (2).
   (4) TORQUE the cap assembly to between 97.65 and 88.35 lbf.in (1.10 and 1.00 m.daN ) T.
Subtask 79-21-25-680-051-A
B. Alternative Procedure - Oil System Contamination
   (1) Drain the oil system (Ref. AMM TASK 12-13-79-610-807).
5. Close-up
Subtask 79-21-25-410-051-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 13:14:51 UTC
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