Installation of the Pylon Overheat Sensing-Elements

TASK 36-22-15-400-803-A
Installation of the Pylon Overheat Sensing-Elements

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

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

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

ZONE: 413
ZONE: 414
ZONE: 423
ZONE: 424
FIN: 1HF1 ** ON A/C NOT FOR ALL
FIN: 1HF2 ** ON A/C NOT FOR ALL
FIN: 101HF1 ** ON A/C NOT FOR ALL
FIN: 101HF2 ** 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 5M (16 FT)- ADJUSTABLE
No specific	1	GUN - SPRAY
No specific	1	NITROGEN 1.7 TO 2 BAR (25 TO 30 PSI)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.78 and 0.56 m.daN (69.03 and 49.56 lbf.in )
No specific	Torque wrench: range to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in )
98D27803000000	AR	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L12003001000	AR	HARNESS,SAFETY
FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON)
FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)
No specific	Torque wrench: range to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )
FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
FOR [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
No specific	Torque wrench: range to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BGB1)	Non Aqueous Cleaner-Sensing element - Xylene based -
No specific	tie-wraps
FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON)
FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)
(Material No.14QDC1)	Wire-Locking Dia: 0.5 mm (0.020 inch) CRES -
FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
FOR [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
(Material No.14QDC1)	Wire-Locking Dia: 0.5 mm (0.020 inch) CRES -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
413	UPPER FWD PYLON
414	UPPER FWD PYLON
423	UPPER FWD PYLON
424	UPPER FWD PYLON
191DB
FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON)
FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
413DL, 413ET, 472AR
FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)
FOR [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
423ET, 424DR, 481AL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	SEAL	AIPC 36-11-86-01-300

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-00-00-481-002-A	Installation of the Wingrip
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 36-12-00-860-802-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-803-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 36-22-00-710-802-A	Operational Test of the Overheat Detection System
TASK 36-22-00-790-802-A	Leak Check on all the Bleed Air Ducts and the Packs Components
TASK 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
TASK 54-53-11-400-804-A	Installation of the Pylon-to-Wing Access Panels and Doors
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
Pylon Overheat Sensing-Elements
Lockwires Installation

3. Job Set-up
Subtask 36-22-15-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(2) On AIR COND panel 30VU:

Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate the pneumatic system.

(3) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(4) On FLAPS panel 114VU:

Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
Make sure that the WARNING NOTICE(S) is in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.

(5) On the access door 191DB, on the HP ground connector:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the pneumatic system.

(6) Make sure that the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is in position at the pylon.
(7) Make sure that you put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).

Subtask 36-22-15-865-057-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1HF2 (SNSG ELEMOVHT, ENG 2 PYLON) FOR FIN: 1HF1 (SNSG ELEMOVHT, ENG 1 PYLON)
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
FOR FIN: 101HF2 (SENSING ELEMENTOVHT, R PYLON LOOP B) FOR FIN: 101HF1 (SENSING ELEMENTOVHT, L PYLON LOOP B)
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-22-15-010-057-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that these access panels are removed (Ref. AMM TASK 54-53-11-000-804):
(a) FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON), [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
413DL 413ET 472AR
(b) FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON), [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
423ET 424DR 481AL

Subtask 36-22-15-110-060-A ** ON A/C NOT FOR ALL

D. Cleaning
(1) Remove the CAP-BLANKING from each electrical connector and receptacle.
(2) Apply the Non Aqueous Cleaner-Sensing element - Xylene based - (Material No.08BGB1) with a GUN - SPRAY:

On the end fittings of the sensing elements, of the cable assemblies and of all other connectors
Into the receptacles of the connectors, where necessary, to clean them.

NOTE: Do not use probes, swabs or any other instruments to examine the ends of the connectors when you clean them.

(3) Dry all parts of the sensing elements.

WARNING: DO NOT EXCEED 30PSIG (2,1KG/CM2) OF PRESSURE AT THE NOZZLE WHEN USING COMPRESSED AIR OR NITROGEN IN THIS CLEANING PROCESS. ALSO WEAR STURDY GOGGLES OR A FACE SHIELD. PARTICLES OR LIQUID DROPLETS PROPELLED BY HIGH PRESURE CAN CAUSE PERMANENT EYE INJURY.

(a) Dry all the components with a NITROGEN 1.7 TO 2 BAR (25 TO 30 PSI) at a pressure of not more than 2.1 bar (30.46 psi).

4. Procedure
Subtask 36-22-15-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Overheat Sensing Elements
(1) Make sure that the work area is clean and clear of tools and other items.
(2) FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON), [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Install the two grommets (28) on the sensing element (25).
(b) Install the electrical connector (24) and nut (23) on the bracket (11).
1 TORQUE the nut (23) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
(c) Bend the sensing element (25) to make an S-shape and install them in the two clamps (26) and put the electrical connector (12) in the correct position.
1 Obey the permitted tolerances and the instructions related to the bending radius.
2 Make sure that the two grommets (28) are in correct position on the two clamps (26).
(d) Lock the two clamps (26).

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.

1 Close the two clamps (26) and lock them with the two quarter-turn fasteners (27).
(e) Installation of the lockwires
1 Safety the nut (23) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail C).
2 Safety the electrical connector (24) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail D).
(f) Install the bracket (11) on the structures (7) and (10).
(g) Install the electrical connector (21) and nut (20).
1 TORQUE the nut (20) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the nut (20) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail E).
3 Safety the electrical connector (21) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail F).
(h) Connect the electrical connector (19) to the electrical connector (21).
1 TORQUE the electrical connector (19) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (19) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail G).
(i) Connect the electrical connector (22) to the electrical connector (24).
1 TORQUE the electrical connector (22) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (22) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail H).
(j) Connect the electrical connector (15) to the electrical connector (17).
1 TORQUE the electrical connector (15) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (15) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail J).
(k) Install the electrical connector (14) and nut (13).
1 TORQUE the nut (13) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (14) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail K).
3 Safety the nut (13) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail L).
(l) Connect the electrical connector (12) to the electrical connector (14).
1 TORQUE the electrical connector (12) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (12) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail M).
(m) Install the grommet (31) on the sensing element (25).
(n) Put the sensing element (25) and the grommet (31) in the clamp (29).
1 Make sure that the grommet (31) is in correct position on the clamp (29).
(o) Lock the clamp (29).

1 Close the clamp (29) and lock them with the quarter-turn fastener (30).
(3) FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B), [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)

(a) Install the three grommets (28) on the sensing element (18).
(b) Install the electrical connector (17) and nut (16) on the bracket (11).
1 TORQUE the nut (16) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
(c) Bend the sensing element (18) to make an S-shape and install them in the three clamps (26) and put the electrical connector (19) in the correct position.
1 Obey the permitted tolerances and the instructions related to the bending radius.
2 Make sure that the three grommets (28) are in correct position on the three clamps (26).
(d) Lock the three clamps (26).

1 Close the three clamps (26) and lock them with the three quarter-turn fasteners (27).
(e) Installation of the lockwires
1 Safety the nut (16) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail A).
2 Safety the electrical connector (17) 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail B).
(f) Install the bracket (11) on the structures (7) and (10).
(g) Install the electrical connector (21) and nut (20).
1 TORQUE the nut (20) to between 0.68 and 0.57 m.daN (60.18 and 50.44 lbf.in )

.
2 Safety the electrical connector (12) with the 14QDC1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES - (detail M).
(4) Install the four washers (9) and bolts (8) on the structures (7) and (10).
(a) Tighten the four bolts (8).
(5) Install the bellows (4).
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Install a new AIPC 36-11-86-01-300 SEAL (2) on the bellows (4).
(c) Compress the bellows (4) with your hands and install it in the correct position on the precooler (1).

NOTE: If necessary, use the tie-wraps to compress the bellows (4).

(d) Install the clamps (3) and (5) on the bellows (4).
(e) Make sure that the positions of the clamps (3) and (5) agree with the positions you recorded at the removal.
(f) TORQUE the nut on the clamp (3) to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in )

.
1 Identify the tightened nut of the clamp (3) with a red line (Ref. AMM TASK 20-23-22-910-001).
(g) TORQUE the nut on the clamp (5) to between 0.78 and 0.56 m.daN (69.03 and 49.56 lbf.in )

.
1 Identify the tightened nut of the clamp (5) with a red line (Ref. AMM TASK 20-23-22-910-001).

Subtask 36-22-15-865-058-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1HF2 (SNSG ELEMOVHT, ENG 2 PYLON) FOR FIN: 1HF1 (SNSG ELEMOVHT, ENG 1 PYLON)
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
FOR FIN: 101HF2 (SENSING ELEMENTOVHT, R PYLON LOOP B) FOR FIN: 101HF1 (SENSING ELEMENTOVHT, L PYLON LOOP B)
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-22-15-710-052-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do the operational test of the overheat detection system (Ref. AMM TASK 36-22-00-710-802).

Subtask 36-22-15-710-053-A ** ON A/C NOT FOR ALL

D. Do this test:
(1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-803) or with the APU (Ref. AMM TASK 36-12-00-860-802).
(2) On panel 30VU, set the X-BLEED selector to OPEN.
(3) Do the leak check (Ref. AMM TASK 36-22-00-790-802).
(a) If you pressurize the bleed system through the HP ground connector, the supplied pressure 30 psi (2.07 bar) must be stable.
(b) Make sure that there are no leaks at the junctions downstream and upstream of the bleed duct (3).
(4) Install the thermal protection (6).
(a) Make sure that the sense lines of the bleed-air precooler exchanger are installed in the notch of the thermal protection (6).

5. Close-up
Subtask 36-22-15-410-054-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 (Ref. AMM TASK 54-53-11-400-804):
(a) FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON), [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
413DL 413ET 472AR
(b) FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON), [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
423ET 424DR 481AL
(3) On FLAPS panel 114VU:

Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the flap/slat control lever.

(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).

Subtask 36-22-15-862-052-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:16:51 UTC