Operational Check of Engine-Bottle Low-Pressure Indicating-Circuit

TASK 26-21-00-710-002-A
Operational Check of Engine-Bottle Low-Pressure Indicating-Circuit

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 262100-02
OPERATIONAL CHECK OF BOTTLE LOW PRESSURE INDICATING CIRCUIT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	ALLEN KEY 3/32 IN
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
FOR [1000EM1] (ENGINE-1)
415BL, 415BR
FOR [1000EM2] (ENGINE-2)
425BL, 425BR
FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1)
415BL
FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2)
425BL
FOR [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)
415CR
FOR [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)
425CR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 54-51-21-000-802-A	Removal of the Pylon Lateral Access-Doors
TASK 54-51-21-400-802-A	Installation of the Pylon Lateral Access-Doors
Test of the Engine Fire-Extinguisher Bottle Low Pressure ** ON A/C NOT FOR ALL
Test of the Engine Fire-Extinguisher Bottle Low Pressure ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-21-00-861-053-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 26-21-00-941-060-A

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Make sure that the ENG/MODE/CRANK/NORM/IGN/START selector switch is in the NORM position.
(b) Put a WARNING NOTICE(S) in position to tell persons not to operate ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 26-21-00-865-071-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q41
** ON A/C ALL
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q44
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q42
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B	2WE1	Q43
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A	1WE1	Q42
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B	2WE2	Q41
121VU	ENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A	1WE2	Q40

Subtask 26-21-00-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the engine.
(2) Remove these access panels:
(a) FOR [1000EM1] (ENGINE-1)
415BL 415BR
(b) FOR [1000EM2] (ENGINE-2)
425BL 425BR

Subtask 26-21-00-010-055-B ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the pylon.
(2) Remove the following access doors (Ref. AMM TASK 54-51-21-000-802):
(3) FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1)

415BL.

(4) FOR [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)

415CR.

(5) FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2)

425BL.

(6) FOR [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)

425CR.

4. Procedure
Subtask 26-21-00-710-054-A ** ON A/C NOT FOR ALL

A. Operational Test of the Engine Fire-Extinguisher Bottles Low-Pressure (for P/N 86181007)

ACTION	RESULT
1.In the left (right) engine pylon, on the fire-extinguisher bottle 6WE1 (6WE2):	On the ENG/APU FIRE panel 1WD (overhead panel 20VU):
A.Push the pressure contact pushbutton switch.	On the AGENT 1 pushbutton switch, the DISCH legend comes on.
B.Release the pressure contact pushbutton switch.	On the AGENT 1 pushbutton switch, the DISCH legend goes off.
2.In the left (right) engine pylon, on the fire-extinguisher bottle 8WE1 (8WE2):	On the ENG/APU FIRE panel 1WD:
A.Push the pressure contact pushbutton switch.	On the AGENT 2 pushbutton switch, the DISCH legend comes on.
B.Release the pressure contact pushbutton switch.	On the AGENT 2 pushbutton switch, the DISCH legend goes off.

Subtask 26-21-00-710-054-B ** ON A/C NOT FOR ALL

CAUTION: TO DO THE MANUAL PRESSURE TEST OF THE ENGINE-FIRE EXTINGUISHER BOTTLE, TURN THE ALLEN KEY CLOCKWISE UNTIL YOU FEEL A FORCE (AT APPROXIMATELY 10 DEGREES). DO NOT TURN THE ALLEN KEY MORE THAN NECESSARY TO PREVENT DAMAGE TO THE PRESSURE SWITCH.

A. Operational Test of the Engine Fire-Extinguisher Bottles Low-Pressure

ACTION	RESULT
1.In the left (right) engine pylon, on the fire-extinguisher bottle 6WE1 (6WE2):	On the ENG/APU FIRE panel 1WD (overhead panel 20VU):
A.Engage the ALLEN KEY 3/32 IN and turn it clockwise (approximately 10 degrees) until you can feel a force.	On the AGENT 1 pushbutton switch, the DISCH legend comes on.
B.Release the Allen wrench to let the test point go back by itself to its initial position.	On the AGENT 1 pushbutton switch, the DISCH legend goes off.
2.In the left (right) engine pylon, on the fire-extinguisher bottle 8WE1 (8WE2):	On the ENG/APU FIRE panel 1WD (overhead panel 20VU):
A.Engage the allen wrench (3/32 in. hex key); turn the Allen wrench clockwise (by 10 degrees approximately) until you can feel a force.	On the AGENT 2 pushbutton switch, the DISCH legend comes on.
B.Release the Allen wrench to let the test point go back by itself to its initial position.	On the AGENT 2 pushbutton switch, the DISCH legend goes off.

Subtask 26-21-00-710-069-A ** ON A/C NOT FOR ALL

B. Operational Test of the Engine Fire-Extinguisher Bottles Low-Pressure (for P/N 34100005-1 and P/N 472088-series)

ACTION	RESULT
1.In the left (right) engine pylon, on the fire-extinguisher bottle 6WE1 (6WE2):	On the ENG/APU FIRE panel 1WD (overhead panel 20VU):
A.Engage the ALLEN KEY 3/32 IN and turn it clockwise (approximately 10 degrees) until you can feel a force.	On the AGENT 1 pushbutton switch, the DISCH legend comes on.
B.Release the Allen wrench to let the test point go back by itself to its initial position.	On the AGENT 1 pushbutton switch, the DISCH legend goes off.
2.In the left (right) engine pylon, on the fire-extinguisher bottle 8WE1 (8WE2):	On the ENG/APU FIRE panel 1WD (overhead panel 20VU):
A.Engage the allen wrench (3/32 in. hex key); turn the Allen wrench clockwise (by 10 degrees approximately) until you can feel a force.	On the AGENT 2 pushbutton switch, the DISCH legend comes on.
B.Release the Allen wrench to let the test point go back by itself to its initial position.	On the AGENT 2 pushbutton switch, the DISCH legend goes off.

5. Close-up
Subtask 26-21-00-410-055-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install these access panels:
(a) FOR [1000EM1] (ENGINE-1)
415BL 415BR.
(b) FOR [1000EM2] (ENGINE-2)
425BL 425BR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 26-21-00-410-055-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install these access doors (Ref. AMM TASK 54-51-21-400-802):
(3) FOR [6WE1] (BOTTLE 1-FIRE EXTING, ENG 1)

415BL.

(4) FOR [8WE1] (BOTTLE 2-FIRE EXTING, ENG 1)

415CR.

(5) FOR [6WE2] (BOTTLE 1-FIRE EXTING, ENG 2)

425BL.

(6) FOR [8WE2] (BOTTLE 2-FIRE EXTING, ENG 2)

425CR.

(7) Remove all the fixtures, tools, test and support equipment used during this procedure.
(8) Remove the access platform(s).
(9) Remove the WARNING NOTICE(S).

Subtask 26-21-00-862-053-A

B. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 04:26:59 UTC