Installation of the Pneumatic Sense Lines in the Pylon

TASK 36-11-49-400-029-A
Installation of the Pneumatic Sense Lines in the Pylon

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.

1. Reason for the Job
This task gives the installation procedures of the sense lines installed between:

The bleed-pressure regulator-valve control-solenoid and the pylon interface
The fan-air valve control-thermostat and the fan air valve
The bleed transferred pressure-transducer, the bleed-pressure regulator-valve control-solenoid and the pylon interface
The bleed regulated pressure-transducer and the duct assy
The HP bleed override-solenoid and the pylon interface (optional).

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	FOIL - ALUMINUM
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.76 and 1.44 m.daN (12.98 and 10.62 lbf.ft )
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 2.3 and 2.0 m.daN (16.96 and 14.75 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03PBB1)	Lubricant-Anti Seize High Temp. -
(Material No.03QBC1)	Dry lubricant-General Assembly Molybdenum Disulfide & Silicone -
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
413CL, 413DL, 414CR, 415AL, 415AR, 437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
423CL, 423DL, 424CR, 425AL, 425AR, 447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-21-12-911-001-A	Tightening Torques for Pipe Unions (not for OXYGEN Unions)
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 24-41-00-862-002-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 36-12-00-860-001-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-002-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Sense Lines Installed Between the Bleed-Pressure Regulator-Valve Control- Solenoid and the Pylon Interface
Sense Lines Installed Between the Fan-Air Valve Control-Thermostat and the Fan Air Valve
Sense Lines Between the Transferred Pressure-Transducer, the Bleed-Pressure Regulator-Valve Control-Solenoid and the Pylon Interface
Sense Lines Installed Between the Bleed Regulated Pressure-Transducer and the Duct Assy
Sense Lines Between the HP Bleed Override-Solenoid and the Pylon Interface

3. Job Set-up
Subtask 36-11-49-860-118-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) or (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) In the cockpit, on AIR COND panel 30VU:

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

(4) In the cockpit, on ENG panel 115VU:

Make sure that the WARNING NOTICE(S) is in position to tell persons not to start engine 1(2).

(5) 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) In the cockpit, 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
Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 36-11-49-010-209-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 36-11-49-040-148-A ** ON A/C NOT FOR ALL

C. Make Sure that the Thrust Reverser is Unserviceable for Maintenance (Ref. AMM TASK 78-30-00-481-041).

Subtask 36-11-49-865-180-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-010-210-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Make sure that an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position at the pylon.
(2) Make sure that these access panels are removed:
(a) FOR [1000EM1] (ENGINE-1)
413CL 414CR 413DL 415AL 415AR
(b) FOR [1000EM2] (ENGINE-2)
423CL 424CR 423DL 425AL 425AR.

4. Procedure
Subtask 36-11-49-420-124-B ** ON A/C NOT FOR ALL

A. Installation of the Sense Lines Between the Bleed-Pressure Regulator-Valve Control-Solenoid and the Pylon Interface

Sense Lines Installed Between the Bleed-Pressure Regulator-Valve Control- Solenoid and the Pylon Interface ** ON A/C NOT FOR ALL

NOTE: The sense line (1) is installed between the bleed-pressure regulator-valve control-solenoid (3) and the upper front-spar datum.
The sense line (10) is installed between the upper front-spar datum and the pylon interface (17).

(1) If you use the APU to energize the electrical circuits, stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

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

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Make sure that the parts retained from the removed component are clean and in the correct condition.
(5) Install the sense line (10) as follows:
(a) Put the sense line (10) in position at the pylon interface (17) and at the upper front-spar datum.
(b) Install the washers (18) and the screws (19) on the sense line (10) at the pylon interface (17).
(c) Install the washers (11) and the screws (12) on the sense line (10) at the upper front-spar datum.
(d) Install the clamps that attach the sense line (10):
1 Install the half clamps (15), the half flanges (14), the nut (16) and the screw (13).
2 Tighten the screw (13).
(e) Tighten the screws (12) and (19).
(f) Connect the sense line (20) to the sense line (10) at the pylon interface (17).
(g) TORQUE the union of the sense line (20) to between 2.3 and 2.0 m.daN (16.96 and 14.75 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(6) Install the sense line (1) as follows:

CAUTION: APPLY ONLY A THIN LAYER OF GREASE TO THE THREADS OF THE HOSE-ASSEMBLY COUPLING NUTS, AND REMOVE THE UNWANTED GREASE TO PREVENT CONTAMINATION OF THE HOSE ASSEMBLY. IF YOU USE TOO MUCH GREASE, IT CAN CAUSE CLOGGING OF THE HOSE ASSEMBLY OR DAMAGE TO THE RELATED COMPONENTS.

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

(d) TORQUE the unions of the sense line (1) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).

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.

(e) Safety the unions of the sense line (1) to the unions of the sense line (2) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-11-49-420-125-B ** ON A/C NOT FOR ALL

B. Installation of the Sense Lines Installed Between the Fan-Air Valve Control-Thermostat and the Fan Air Valve

Sense Lines Installed Between the Fan-Air Valve Control-Thermostat and the Fan Air Valve ** ON A/C NOT FOR ALL

NOTE: The sense line (4) is installed between the fan-air valve control-thermostat (12) and the upper front-spar datum.
The sense line (7) is installed between the upper front-spar datum and the fan air valve (16).

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean and apply lubricant.

(a) Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the unions of the fan air valve (16) and of the fan-air valve control-thermostat (12).
(4) Install the sense line (7).
(a) Put the sense line (7) in position between the fan air valve (16) and the upper front-spar datum.
(b) Connect the sense line (7) to the union of the fan air valve (16).
(c) Install the washers (14) and the screws (15) to the sense line (7) at the upper front-spar datum.
(d) Install the clamp that attaches the sense line (7).
1 Install the bushing (9), the clamp (8), the washer (10) and the screw (11).
2 Tighten the screws (11) and (15).
(e) Do this step to torque the union of the sense line (7) on the union of the fan air valve (16).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the union of the sense line (7) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(f) Safety the union of the sense line (7) to the fan air valve (16) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(5) Install the sense line (4).
(a) Connect the sense line (4) to the union of the fan-air valve control-thermostat (12) and to the sense line (7).
(b) Install the clamps that attach the sense line (4).
1 Install the half clamps (3) and (6), the covers (2), the screws (1) and the nuts (5).
2 Tighten the screws (1).
(c) Do this step to torque the unions of the sense line (4) on the union of the fan-air valve control-thermostat (12) and on the union of the sense line (7).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the unions of the sense line (4) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(d) Safety the unions of the sense line (4) to the fan-air valve control-thermostat (12) and to the union of the sense line (13) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-11-49-420-126-B ** ON A/C NOT FOR ALL

C. Installation of the Sense Lines Between the Bleed Transferred Pressure-Transducer, the Bleed-Pressure Regulator-Valve Control-Solenoid and the Pylon Interface

Sense Lines Between the Transferred Pressure-Transducer, the Bleed-Pressure Regulator-Valve Control-Solenoid and the Pylon Interface ** ON A/C NOT FOR ALL

NOTE: The sense line (2) is installed between the bleed-pressure regulator-valve control-solenoid (3) and the upper front-spar datum.
The sense line (6) is installed between the upper front-spar datum, the bleed transferred pressure-transducer (7) and rib 1.
The sense line (14) is installed between rib 1 and the pylon interface (19).

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean and apply lubricant.

(a) Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union of the bleed-pressure regulator-valve control-solenoid (3).
(b) Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union of the bleed transferred pressure-transducer (7).
(4) Install the sense line (6).
(a) Put the sense line (6) in position at the upper front-spar datum and at rib 1.
(b) Connect the sense line (6) to the union of the bleed transferred pressure-transducer (7).
(c) Install the washers (5) and the screws (4) at the upper front-spar datum.
(d) Install the washers (12) and the screws (13) at rib 1.
(e) Tighten the screws (4) and (13).
(f) Install the clamps that attach the sense line (6).
1 Install the bushing (11), the half clamps (9), the screw (8) and the nut (10).
2 Tighten the screw (8).
(g) Do this step to torque the union of the sense line (6) on the union of the bleed transferred pressure-transducer (7).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the union of the sense line (6) to between 1.76 and 1.44 m.daN (12.98 and 10.62 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(5) Install the sense line (14).
(a) Put the sense line (14) in position between the pylon interface (19) and the sense line (6).
(b) Install the washers (20) and the screws (21) on the pylon interface (19).
(c) Tighten the screws (21).
(d) Connect the sense line (14) to the sense line (6) at rib 1.
(e) Install the clamps that attach the sense line (14).
1 Install the bushing (16), the clamp (15), the washer (17) and the screw (18).
2 Tighten the screw (18).
(f) TORQUE the union of the sense line (14) on the union of the sense line (6) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(g) Safety the union of the sense line (14) to a screw (13) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(h) Connect the sense line (22) to the sense line (14).
(i) TORQUE the union of the sense line (22) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(6) Install the sense line (2).
(a) Connect the union of the sense line (2) to the sense line (6) at upper front-spar datum and to the bleed-pressure regulator-valve control-solenoid (3).
(b) Do this step to torque the unions of the sense line (2).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the unions of the sense line (2) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(c) Safety the unions of the sense line (2) to the bleed-pressure regulator-valve control-solenoid (3) and to a screw (4) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-11-49-420-127-C ** ON A/C NOT FOR ALL

D. Installation of the Sense Lines Between the Bleed Regulated Pressure-Transducer and the Duct Assy

Sense Lines Installed Between the Bleed Regulated Pressure-Transducer and the Duct Assy ** ON A/C NOT FOR ALL

NOTE: The sense line (4) is installed between the bleed regulated pressure-transducer (10) and rib 1.
The sense line (13) is installed between rib 1 and the duct assy (14).

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean and apply lubricant.

(a) Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union of the bleed regulated pressure-transducer (10).
(4) Install the sense line (4).
(a) Put the sense line (4) in position at rib 1 and connect it to the union of the bleed regulated pressure-transducer (10).
(b) Install the washers (11) and the screws (12) on the sense line (4) at rib 1.
(c) Tighten the screws (12).
(d) Install the clamp that attaches the sense line (4).
1 Install the half clamps (2), the bushing (3), the screw (1) and the nut (5).
2 Install the bushing (17), the half clamps (16), the screw (15) and the nut (19).
3 Tighten the screws (1) and (15).
(e) Do this step to torque the union of the sense line (4) on the union of the bleed regulated pressure-transducer (10).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the union of the sense line (4) to between 1.76 and 1.44 m.daN (12.98 and 10.62 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(f) Safety the union of the sense line (4) to the bleed regulated pressure-transducer (10) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(5) Install the sense line (13).
(a) Connect the sense line (13) to the sense line (4) at rib 1.
(b) Clean and apply lubricant.

1 Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union of the duct assy (14).
(c) Connect the sense line (13) to the union of the duct assy (14).
(d) Install the clamp that attaches the sense line (13).
1 Install the half clamps (8), the half flanges (7), the screw (6) and the nut (9).
2 Tighten the screw (6).
(e) TORQUE the unions of the sense line (13) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(f) Safety the union of the sense line (13) to a screw (12) at rib 1 with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-11-49-420-128-C ** ON A/C NOT FOR ALL

E. Installation of the Sense Lines Between the HP Bleed Override-Solenoid and the Pylon Interface

Sense Lines Between the HP Bleed Override-Solenoid and the Pylon Interface ** ON A/C NOT FOR ALL

NOTE: The sense line (2) is installed between the HP bleed override-solenoid (1) and the rib 1.
The sense line (9) is installed between the rib 1 and the pylon interface (17).

(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean and apply lubricant.

(a) Clean and apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union of the HP bleed override-solenoid (1).
(4) Install the sense line (2).
(a) Put the sense line (2) in position between the HP bleed override-solenoid (1) and rib 1.
(b) Connect the sense line (2) to the union of the HP bleed override-solenoid (1).
(c) Install the washers (7) and the screws (8) on sense line (2) at rib 1.
(d) Tighten the screws (8).
(e) Install the clamps that attach the sense line (2).
1 Install the bushing (6), the half clamps (4), the screw (3) and the nut (5).
2 Tighten the screw (3).
(f) Do this step to torque the union of the sense line (2) on the union of the HP bleed override-solenoid (1).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT THE PNEUMATIC LINES ON UNIONS.

1 TORQUE the union of the sense line (2) to between 1.76 and 1.44 m.daN (12.98 and 10.62 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(5) Install the sense line (9).
(a) Put the sense line (9) in position between the pylon interface (17) and the sense line (2) at rib 1.
(b) Install the washers (16) and the screws (15) on sense line (9) at the pylon interface (17).
(c) Tighten the screws (15).
(d) Connect the sense line (9) to the sense line (2) at rib 1.
(e) Install the clamps that attach the sense line (9).
1 Install the bushing (11), the clamp (10), the washer (12) and the screw (13).
2 Tighten the screw (13).
(f) TORQUE the union of the sense line (9) on the union of the sense line (2) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).
(g) Safety the union of the sense line (9) to a screw (8) with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
(h) Connect the sense line (14) to the sense line (9).
(i) TORQUE the union of the sense line (14) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

(Ref. AMM TASK 20-21-12-911-001).

Subtask 36-11-49-480-080-A ** ON A/C NOT FOR ALL

F. Prepare the Leak Test
(1) Do the steps that follow to install FOIL - ALUMINUM on the sense line connections:

Wind the foil wrap around the joint one time.
Twist the seam of the foil wrap tight.
Make the foil wrap as tight as possible on the tube but do not cause damage to the wrap.
Attach the foil wrap at the two sides of the pneumatic joint with lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-11-49-790-055-A ** ON A/C NOT FOR ALL

G. Leak Test
(1) Pressurize the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-002) or with the APU (Ref. AMM TASK 36-12-00-860-001).
(a) Make sure that there are no leaks at the sense line connections.

NOTE: There is a leak when the foil installed on the pneumatic connection breaks or when it is too hot.

(2) Remove the materials used to do the leak test.

5. Close-up
Subtask 36-11-49-410-173-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) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 36-11-49-440-109-A ** ON A/C NOT FOR ALL

B. Make the Thrust Reverser Serviceable after Maintenance (Ref. AMM TASK 78-30-00-081-041).

Subtask 36-11-49-865-181-A ** ON A/C NOT FOR ALL

C. 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
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-410-174-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Install these access panels:
(a) FOR [1000EM1] (ENGINE-1)
413CL 414CR 413DL 415AL 415AR
(b) FOR [1000EM2] (ENGINE-2)
423CL 424CR 423DL 425AL 425AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

Subtask 36-11-49-862-105-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:10:19 UTC