Procedure after Engine Fire or Use of Fire-Extinguishing Agents [CFML]

TASK 72-00-00-200-821-A
Procedure after Engine Fire or Use of Fire-Extinguishing Agents

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: A LARGE NUMBER OF O-RINGS, GASKETS AND OTHER TYPES OF SEALS ARE MADE OF VITON MATERIAL. VITON MATERIAL DECOMPOSES WHEN THE TEMPERATURE IS MORE THAN 750 DEG.F (400 DEG.C). ONE OF THE BY-PRODUCTS OF THIS DECOMPOSITION IS HYDROFLUORIC ACID. THIS ACID CAN CAUSE BAD BURNS. THUS, USE ACID-RESISTANT GLOVES IF YOU MUST REPLACE A VITON SEAL DURING MAINTENANCE AFTER A FIRE.

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

1. Reason for the Job
You must do this procedure when fire-extinguishing agents have been used.

NOTE: After any fire damage, the removal of the engine from the aircraft for Inspection is necessary.

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	1	AIR SOURCE FILTERED, DRY
No specific	1	VACUUM CLEANER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2155)	ardox 6025

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-280-006-A	Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - with Ground Cart Available
TASK 29-00-00-280-006-A-01	Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - Ground Cart not Available
TASK 71-00-00-700-805-A	Dry-Motoring Check
TASK 71-00-51-000-803-A	Removal of the Power Plant with 2D Bootstrap
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
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
ESM 720000

3. Job Set-up
Subtask 72-00-00-941-226-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
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 72-00-00-010-310-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.

Subtask 72-00-00-040-152-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-00-00-010-311-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 72-00-00-280-081-A

A. Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition
(1) If the crew closed the fire shut-off valve during operation of the fire extinguishers, do the check of the hydraulic system after Operation of the engine pumps in possible starvation or cavitation condition (Ref. AMM TASK 29-00-00-280-006) (Ref. AMM TASK 29-00-00-280-006).

Subtask 72-00-00-280-082-A

B. Fire Extinguishing Agents Applied Externally

NOTE: Do as soon as possible to avoid soak of contamination on engine hardware.

(1) If the engine has been exposed to fire extinguishing agents on external surfaces, do as follows where appropriate:
(a) Carbon dioxide (CO2) contamination:
1 Cold sections: parts not exposed to heat require no maintenance action.
2 Hot sections: engine parts which were at elevated temperatures when exposed to CO2 must be removed and checked
(b) Chemical foam contamination

CAUTION: DO NOT ALLOW FOAM TO ENTER ANY ENGINE CAVITIES AS FOAM RESIDUES MAY CAUSE CORROSION DAMAGE.

1 Wash exposed areas using clean, running water.
2 Scrub to remove all foam agents.
(c) Dry chemical powders contamination

CAUTION: DO NOT USE WATER. DRY AGENT COMBINES WITH WATER TO FORM AN EVEN MORE CORROSIVE COMPOUND. DO NOT ALLOW AGENT TO ENTER ANY ENGINE CAVITIES. RESIDUES WILL CAUSE CORROSION DAMAGE.

1 Remove all powder residues from engine by utilizing VACUUM CLEANER and AIR SOURCE FILTERED, DRY between 30 psi (2.07 bar) and 40 psi (2.76 bar) as necessary.
2 If powder has turned to glaze due to elevated temperatures, scrub with ardox 6025 (Material No.CP2155) .

Subtask 72-00-00-280-083-A

C. Fire Extinguishing Agents Applied Internally
(1) If the engine has been exposed to fire extinguishing agents on internal surfaces, do as follows where applicable:
(a) Carbon dioxide (CO2) contamination: Remove the engine for disassembly, inspection and cleaning (Ref. AMM TASK 71-00-51-000-803) and ESM 720000.
(b) Chemical foam contamination.

NOTE: Do as soon as possible to avoid soak of contamination on engine hardware.

1 Flush with clean water and motor engine (if practicable) to remove foam residues.
2 Remove engine for disassembly, inspection and cleaning (Ref. AMM TASK 71-00-51-000-803) and ESM 720000.
(c) Dry chemical powder contamination.
1 Remove all accessible loose powder using VACUUM CLEANER and AIR SOURCE FILTERED, DRY between 30 psi (2.07 bar) and 40 psi (2.76 bar).
2 If powder has turned to glaze due to elevated temperatures, rinse with ardox 6025 (Material No.CP2155) .
3 Dry-motor to clear and dry engine (Ref. AMM TASK 71-00-00-700-805).
4 Remove engine for disassembly and cleaning (Ref. AMM TASK 71-00-51-000-803) and ESM 720000.

5. Close-up
Subtask 72-00-00-410-267-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 72-00-00-440-143-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-00-00-410-268-A

C. Close Access
(1) 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
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:50:55 UTC