Inspection of the Pressure Indicating Tubes

TASK 36-21-49-200-011-A
Inspection of the Pressure Indicating Tubes

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

1. Reason for the Job
This TASK gives the procedure for the inspection of the pressure indicating tubes after component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.14SBA1)	Textile-Lint free Cotton -

C. 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

D. 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 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 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
TASK 70-42-11-300-010-A	Hand Polish and Blend Procedure
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Locations on the Pressure Indicating Tube

3. Job Set-up
Subtask 36-21-49-861-054-A ** ON A/C NOT FOR ALL

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

Subtask 36-21-49-941-062-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 (OFF legend is on),
make sure that the APU BLEED pushbutton switch is released (ON legend is off),
put a WARNING NOTICE(S) to tell persons not to operate the pneumatic system.

(3) On the ENG panel 115VU:

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

(4) On the HP ground connector:

put a WARNING NOTICE(S) to tell persons not to pressurize the pneumatic system.

(5) On 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) to tell persons not to energize the FADEC 1(2).

Subtask 36-21-49-010-060-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) in position below the engine.

Subtask 36-21-49-040-056-A ** ON A/C NOT FOR ALL

D. Deactivate the Thrust Reverser

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) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 36-21-49-010-061-A ** ON A/C NOT FOR ALL

E. 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 36-21-49-110-052-A ** ON A/C NOT FOR ALL

F. Clean the Pressure Indicating Tubes

Locations on the Pressure Indicating Tube ** ON A/C NOT FOR ALL

(1) Make a clean Textile-Lint free Cotton - (Material No.14SBA1) moist with V01-076Methyl Ethyl Ketone, Technical grade. Use the cloth to clean the pressure indicating tubes.
(2) Dry the pressure indicating tubes and hoses with a clean Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 36-21-49-230-050-A ** ON A/C NOT FOR ALL

A. Fluorescent penetrant examine the tubes for cracks (Ref. AMM TASK 70-23-05-230-010)
(1) If the tube has cracks, reject it.

Subtask 36-21-49-210-056-A ** ON A/C NOT FOR ALL

B. Examination of the Tubes
(1) Examine the tubes at location R.
(a) Examine the tubes for nicks.
1 Nicks up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Nicks more than 0.003 in. (0.07 mm) deep, reject.
(b) Examine the tubes for scratches.
1 Scratches up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Scratches more than 0.003 in. (0.07 mm) deep, reject.
(c) Examine the tubes for dents.
1 Dents up to 0.050 in. (1.27 mm) deep with the radius not less than 0.056 in. (1.42 mm) are permitted.
2 Two or more dents as described in 1_ with more than 1.00 in. (25.4 mm) between the edges are permitted.
3 Dents larger than specified in 1_ or 2_, reject.
(d) Examine the tubes for rubs.
1 Rubs up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Rubs more than 0.003 in. (0.07 mm) deep, reject.
(2) Examine the tubes at location S.
(a) Examine the tubes for nicks.
1 Nicks up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Nicks more than 0.003 in. (0.07 mm) deep, reject.
(b) Examine the tubes for scratches.
1 Scratches up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Scratches more than 0.003 in. (0.07 mm) deep, reject.
(c) Examine the tubes for distortion.
1 If any distortion is found, reject.
(d) Examine the tubes for dents.
1 Dents up to 0.050 in. (1.27 mm) deep with the radius not less than 0.056 in. (1.42 mm) are permitted.
2 Two or more dents as described in 1_ with more than 1.00 in. (25.4 mm) between the edges are permitted.
3 Dents larger than specified in 1_ or 2_, reject.
(e) Examine the tubes for rubs.
1 Rubs up to 0.003 in. (0.07 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Rubs more than 0.003 in. (0.07 mm) deep, reject.
(3) Examine the pressure indication tube end connectors at location N, P and T.
(a) Examine the tube end connectors for nicks.
1 Nicks more than 0.010 in. (0.25 mm) deep (Ref. AMM TASK 70-42-11-300-010).
(b) Examine the tube end connectors for burrs.
1 If there are any burrs (Ref. AMM TASK 70-42-11-300-010).
(c) Examine the tube end fittings for other damage.
1 Damage up to three turns of the thread (Ref. AMM TASK 70-42-11-300-010).
2 Damage to more than three turns of the thread, reject.
(4) Examine the tube sealing-face at locations V, W and X.
(a) Examine the tube sealing-face for scratches.
1 Circumferential scratches up to 0.010 in. (0.25 mm) deep (Ref. AMM TASK 70-42-11-300-010).
2 Circumferential scratches more than 0.010 in. (0.25 mm) deep, reject.

5. Close-up
Subtask 36-21-49-410-058-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-21-49-440-054-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 36-21-49-410-059-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

Subtask 36-21-49-862-054-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:16:21 UTC