Removal of the Pneumatic Sense Lines in the Pylon

TASK 36-11-49-000-029-A
Removal 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 removal 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	PLUG - 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)
413CL, 413DL, 414CR, 415AL, 415AR, 437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
423CL, 423DL, 424CR, 425AL, 425AR, 447AL, 448AR, 461AL, 462AR

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 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 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
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 36-11-49-861-107-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).

Subtask 36-11-49-941-126-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(2) On the 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).
Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.

(3) On the ENG panel 115VU:

Put a WARNING NOTICE(S) in position to tell persons not to start the engine 1(2).

(4) On the HP ground connector:

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

(5) On the ENG section of the 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 1(2).

Subtask 36-11-49-865-179-A ** ON A/C NOT FOR ALL

C. Open, safety and tag 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 36-11-49-010-206-A ** ON A/C NOT FOR ALL

D. 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.

Subtask 36-11-49-040-147-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER IS LOCKED. IF NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO THE REVERSER.

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

Subtask 36-11-49-010-207-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-49-010-208-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 36-11-49-020-131-B ** ON A/C NOT FOR ALL

A. Removal of the Sense Lines Installed 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 and the upper front-spar datum.
The sense line (10) is installed between the upper front-spar datum and the pylon interface.

(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 clamps that attach the sense lines (1) and (10) as follows:
(a) Remove the nuts (8) and the screws (4).
(b) Remove the covers (5) and the half clamps (6) and (7).
(c) Remove the nut (16), the screw (13), the half flanges (14) and the half clamps (15).

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.

(4) Cut, remove and discard the lockwire from the unions of the sense lines (1) and (2).
(5) Remove the sense line (1) as follows:

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

(a) Disconnect the sense line (1) from the bleed-pressure regulator-valve control-solenoid (3).
(b) Disconnect the sense line (1) from the sense line (10) at the upper front-spar datum.
(6) Remove the sense line (10) as follows:
(a) Remove the screws (12) and the washers (11) from the sense line (1) at the upper front-spar datum.
(b) Disconnect the sense line (20) from the sense line (10) at the pylon interface (17).
(c) Remove the screws (19) and the washers (18) from the pylon interface (17).
(7) Put the PLUG-BLANKING in each disconnected line end.

Subtask 36-11-49-020-132-B ** ON A/C NOT FOR ALL

B. Removal 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 clamps that attach the sense lines (4) and (7).
(a) Remove the nuts (5) and the screws (1).
(b) Remove the covers (2) and the half clamps (3) and (6).
(c) Remove the screw (11), the washer (10), the clamp (8) and the bushing (9).
(2) Remove the sense line (4).
(a) Cut, remove and discard the lockwire from the union of the sense line (4) and the fan-air valve control-thermostat (12).
(b) Disconnect the sense line (4) from the fan-air valve control-thermostat (12).
(c) Disconnect the sense line (4) from the sense line (7) at the upper front-spar datum.
(3) Remove the sense line (7).
(a) Cut, remove and discard the lockwire from the unions of the sense lines (13) and (4).
(b) Cut, remove and discard the lockwire from the union of the sense line (7) and the fan air valve (16).
(c) Remove the screws (15) and the washers (14) from the sense line (4) at the upper front-spar datum.
(d) Disconnection 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 Cut, remove and discard the lockwire from the union of the sense line (7) and from the fan-air valve (16).
2 Disconnect the sense line (7) from the fan air valve (16).
(e) Disconnect the sense line (4) from the fan-air valve control-thermostat (12).
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 36-11-49-020-133-B ** ON A/C NOT FOR ALL

C. Removal of the Sense Lines Installed 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 clamps that attach the sense lines (2), (6) and (14).
(a) Remove the screw (8), the nut (10), the half clamps (9) and the bushing (11).
(b) Remove the screw (18), the washer (17), the clamp (15) and the bushing (16).
(2) Remove the sense line (2).
(a) Cut, remove and discard the lockwire from the union of the sense line (2) and the screw (4) at the upper front-spar datum.
(b) Disconnect the sense line (2) from the sense line (6) at the upper front-spar datum.
(c) Cut, remove and discard the lockwire from the unions of the sense lines (1) and at the bleed-pressure regulator-valve control-solenoid (3).
(d) Disconnection 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 Disconnect the sense line (2) from the bleed-pressure regulator-valve control-solenoid (3).
(3) Remove the sense line (6).
(a) Remove the screws (4) and the washers (5) from the sense line (6) at the upper front-spar datum.
(b) Cut, remove and discard the lockwire from the union of the sense line (14) and t screw (13).
(c) Disconnect the sense line (14) from the sense line (6) at rib 1.
(d) Remove the screws (13) and the washers (12) from the sense line (6) at rib 1.
(e) Disconnection of the sense line (6):

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

1 Disconnect the sense line (6) from the bleed transferred pressure-transducer (7).
(4) Remove the sense line (14).
(a) Disconnect the sense line (22) from the sense line (14) at the pylon interface (19).
(b) Remove the screws (21) and the washers (20) from the pylon interface (19).
(5) Put the PLUG-BLANKING in each disconnected line end.

Subtask 36-11-49-020-134-C ** ON A/C NOT FOR ALL

D. Removal of the Sense Lines Installed 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 clamps that attach the sense lines (4) and (13).
(a) Remove the screw (1), the nut (5), the half clamps (2) and the bushing (3).
(b) Remove the screw (6), the nut (9), the half flanges (7) and the half clamps (8).
(c) Remove the screw (15), the nut (19), the half clamps (16) and the bushing (17).
(2) Remove the sense line (13).
(a) Remove and discard the lockwire from the sense line (13) and the screw (12) at rib 1.
(b) Disconnect the sense line (13) from the sense line (4) at rib 1.
(c) Disconnect the sense line (13) from the duct assy (14).
(3) Remove the sense line (4).
(a) Remove the screws (12) and the washers (11) from the sense line (4) at rib 1.
(b) Disconnection of the sense line (4):

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

1 Disconnect the sense line (4) from the bleed regulated pressure-transducer (10).
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 36-11-49-020-135-C ** ON A/C NOT FOR ALL

E. Removal of the Sense Lines Installed 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 clamps that attach the sense lines (2) and (9).
(a) Remove the screw (3), the nut (5) the half clamps (4) and the bushing (6).
(b) Remove the screw (13), the washer (12), the clamp (10) and the bushing (11).
(2) Remove the sense line (9).
(a) Remove and discard the lockwire from the union of the sense line (9) and the screw (8).
(b) Disconnect the sense line (9) from the sense line (2) at rib 1.
(c) Disconnection of the sense line (9).

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

1 Disconnect the sense line (14) from the sense line (9) at the pylon interface (17).
2 Remove the screws (15) and the washers (16) from the sense line (9) at the pylon interface (17).
(3) Remove the sense line (2).
(a) Remove the screws (8) and the washers (7) from the sense line (2) at rib 1.
(b) Disconnect the sense line (2) from the HP bleed override-solenoid (1).
(4) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 12:37:46 UTC