Removal of the Pylon Fire Detectors

TASK 26-12-16-000-001-A
Removal of the Pylon Fire Detectors

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.

FIN: 3WD1 ** ON A/C NOT FOR ALL
FIN: 3WD2 ** ON A/C NOT FOR ALL
FIN: 4WD1 ** ON A/C NOT FOR ALL
FIN: 4WD2 ** ON A/C NOT FOR ALL

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 - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 26-12-16-000-002-A	Removal of the Support with the Pylon Fire Detectors
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
Pylon Fire Detectors - Location and Installation ** ON A/C NOT FOR ALL
Pylon Fire Detectors - Location and Installation ** ON A/C NOT FOR ALL
Pylon Fire Detectors - Location and Installation ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 26-12-16-941-050-A ** ON A/C NOT FOR ALL

A. 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 start the engine.
(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 the 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 26-12-16-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FIRE DET/LOOP A	7WD1	A06
121VU	ENGINE/ENG1/FIRE DET/LOOP B	8WD1	Q38
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FIRE DET/LOOP B	8WD2	A07
121VU	ENGINE/ENG2/FIRE DET/LOOP A	7WD2	Q39

Subtask 26-12-16-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-050-A ** ON A/C NOT FOR ALL

D. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-12-16-010-051-A ** ON A/C NOT FOR ALL

E. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-16-010-050-B ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-050-C ** ON A/C NOT FOR ALL

G. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 26-12-16-010-051-C ** ON A/C NOT FOR ALL

H. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 26-12-16-010-050-D ** ON A/C NOT FOR ALL

I. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 26-12-16-040-050-B ** ON A/C NOT FOR ALL

J. deactivation of the Thrust Reverser Hydraulic Control Unit (HCU)

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Do the deactivation of the thrust Reverser Hydraulic Control Unit (HCU) 4101KS (Ref. AMM TASK 78-30-00-040-012).

Subtask 26-12-16-010-051-B ** ON A/C NOT FOR ALL

K. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 26-12-16-010-058-A ** ON A/C NOT FOR ALL

L. Get Access
(1) Remove the support with the pylon fire detectors (Ref. AMM TASK 26-12-16-000-002).

4. Procedure
Subtask 26-12-16-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Pylon Fire Detector.
(1) Disconnect the connectors (7).
(a) Put CAP - BLANKING on the electrical connectors (7) and on the responders (11).
(2) Turn the fasteners (1) one quarter turn and open the clamps (2).
(3) Remove the screws (8) and the washers (9).
(4) Remove the responders (11) and the sensing elements (4).

Subtask 26-12-16-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Fire Detectors

CAUTION: DO NOT USE ELECTRICAL OR PNEUMATIC TOOLS TO LOOSEN OR TIGHTEN THE QUARTER-TURN FASTENER ON THE FIRE DETECTOR CLAMP. ONLY USE A MANUAL SCREWDRIVER. ELECTRICAL OR PNEUMATIC TOOLS WILL CAUSE THE FASTENER TO TURN TOO MUCH AND POSSIBLY TO BREAK.

CAUTION: DO NOT BEND THE MANIFOLD OF THE SENSING ELEMENT. IF YOU BEND IT, YOU CAN CAUSE DAMAGE TO THE WELDING.

(1) Turn the quarter-turn fastener (6) by one quarter of a turn and open the clamp (7).
(2) Turn the quarter-turn fasteners (10) by one quarter of a turn and open the clamps (11).
(3) Remove the two bolts (4) and washers (3) from each responder unit (2).
(4) Remove the two responder units (2) and the related sensing elements (9) from the rail assembly (1).

NOTE: The grommet (8) and the grommets (12) are installed on the sensing element (2).

(5) Remove the grommet (8) and the grommets (12) from the sensing element (2).
(6) Remove the two clamps (5) from each responder unit (2).

[Rev.10 from 2021] 2026.04.01 06:37:30 UTC