Removal of the Pylon Overheat Sensing-Elements

TASK 36-22-15-000-805-A
Removal 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 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: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

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
FIN: 1HF2
FIN: 101HF1
FIN: 101HF2

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	1	BRUSH - BRISTLED, SOFT
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	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	AR	CAP - BLANKING
FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
FOR [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
No specific	AR	CAP - BLANKING

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)	Textile-Lint free Cotton -

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)
413ET, 472AR
FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)
FOR [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
423ET, 424CR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-00-00-481-002-A	Installation of the Wingrip
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 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 54-53-11-000-806-A	Removal of the Pylon-to-Wing Access Panels and Doors
Pylon Overheat Sensing-Elements

3. Job Set-up
Subtask 36-22-15-861-054-A

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

Subtask 36-22-15-941-058-A

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:

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

(3) On the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC system 1(2).

(4) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
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.
Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.

(5) On FLAPS panel 114VU:

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

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

Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

(7) 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 36-22-15-865-062-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C 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 36-22-15-010-062-A

D. Get Access
(1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position at the pylon.
(2) Remove these access panels (Ref. AMM TASK 54-53-11-000-806):
(a) FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON), [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B)
413ET 472AR
(b) FOR [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON), [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
423ET 424CR

4. Procedure
Subtask 36-22-15-020-054-A

A. Removal of the Overheat Sensing Elements
(1) Remove the bellows (4):
(a) Remove the thermal protection (6).
(b) Record the position of the clamps (3) and (5) before the removal.
(c) Remove the clamps (3) and (5) from the bellows (4).
(d) Remove the bellows (4) from the precooler (1).
(e) Remove and discard the seal (2).
(f) Put the PLUG-BLANKING in each disconnected line end.
(2) Remove the three bolts (7) and washers (8) from the structures (10) and (11).
(3) FOR [101HF1] (SENSING ELEMENT-OVHT, L PYLON LOOP B), [101HF2] (SENSING ELEMENT-OVHT, R PYLON LOOP B)
(a) Removal of the lockwires

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.

1 Cut and remove the lockwires from the nut (13) and the two electrical connectors (12) and (14).
2 Cut and remove the lockwires from the nut (16) and the two electrical connectors (15) and (17).
3 Cut and remove the lockwire from the electrical connector (21).
4 Cut and remove the lockwires from the nut (23) and the two electrical connectors (22) and (24).
(b) Disconnect the two electrical connectors (14) and (21).
(c) Disengage the sensing element (18) from the clamp (29) and the sensing element (25) from the clamp (32).

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 Turn the quarter-turn fastener (30) by one quarter of a turn and open the clamp (29).
2 Turn the quarter-turn fastener (33) by one quarter of a turn and open the clamp (32).

NOTE: The grommet (31) is installed on the sensing element (18).

NOTE: The grommet (34) is installed on the sensing element (25).

(d) Disconnect the two electrical connectors (17) and (24).
(e) Remove the nut (16) from the electrical connector (15).
(f) Disengage the electrical connector (15) from the bracket (9).
(g) Remove the nut (23) from the electrical connector (22).
(h) Disengage the electrical connector (22) from the bracket (9).
(i) Remove the bracket (9) from the structures (10) and (11).
(j) Remove the nut (13) from the electrical connector (12).
(k) Remove the sensing element (25).

1 Turn the two quarter-turn fasteners (27) by one quarter of a turn and open the two clamps (26).
2 Remove the sensing element (25) from the bracket (9).

NOTE: The two grommets (28) and the grommet (34) are installed on the sensing element (25).

(l) Remove the two grommets (28) and the grommet (34) from the sensing element (25).
(m) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) FOR [1HF1] (SNSG ELEM-OVHT, ENG 1 PYLON), [1HF2] (SNSG ELEM-OVHT, ENG 2 PYLON)
(a) Removal of the lockwires

1 Cut and remove the lockwire from the electrical connector (14).
2 Cut and remove the lockwires from the nut (16) and the two electrical connectors (15) and (17).
3 Cut and remove the lockwires from the nut (23) and the two electrical connectors (22) and (24).
4 Cut and remove the lockwires from the nut (20) and the two electrical connectors (19) and (21).
(b) Disconnect the two electrical connectors (14) and (21).
(c) Disengage the sensing element (18) from the clamp (29) and the sensing element (25) from the clamp (32).

1 Turn the quarter-turn fastener (30) by one quarter of a turn and open the clamp (29).
2 Turn the quarter-turn fastener (33) by one quarter of a turn and open the clamp (32).

NOTE: The grommet (31) is installed on the sensing element (18).

NOTE: The grommet (34) is installed on the sensing element (25).

(d) Disconnect the two electrical connectors (17) and (24).
(e) Remove the nut (16) from the electrical connector (15).
(f) Disengage the electrical connector (15) from the bracket (9).
(g) Remove the nut (23) from the electrical connector (22).
(h) Disengage the electrical connector (22) from the bracket (9).
(i) Remove the bracket (9) from the structures (10) and (11).
(j) Remove the nut (20) from the electrical connector (19).
(k) Remove the sensing element (18).

1 Turn the two quarter-turn fasteners (27) and (33) by one quarter of a turn and open the two clamps (26) and (32).
2 Remove the sensing element (18) from the bracket (9).

NOTE: The two grommets (28) and (34) are installed on the sensing element (18).

(l) Remove the grommet (28), the grommet (31) and the grommet (34) from the sensing element (18).
(m) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 36-22-15-110-061-A

B. Cleaning of the Outer Side of the Connectors
(1) Remove all the collected oil, grease and dirt from the outer side of each connector. To do this, use a BRUSH - BRISTLED, SOFT with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) . Dry with a Textile-Lint free Cotton - (Material No.14SBA1) .

[Rev.10 from 2021] 2026.04.01 01:16:55 UTC