Inspection/Check of the PS12 Line [CFMI]

TASK 72-23-00-280-003-A
Inspection/Check of the PS12 Line

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	AR	WIRE - PLASTIC
No specific	Torque wrench: range to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
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 72-23-00-000-006-A	Removal of the PS12 Line
TASK 72-23-00-400-006-A	Installation of the PS12 Line
Inspection/Check of the PS12 Line (Configuration One)
Inspection/Check of the PS12 Line (Configuration 2)

3. Job Set-up
Subtask 72-23-00-941-068-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 72-23-00-010-079-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 72-23-00-210-053-A ** ON A/C NOT FOR ALL

A. Visual Inspection of the PS12 Line

Inspection/Check of the PS12 Line (Configuration One) ** ON A/C NOT FOR ALL

CAUTION: USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.

(1) Inspect the PS12 line as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Inspect the hose for:
broken hose braid	3 broken wires per plait, and no more than 6 broken wires per assembly, or per lineal 12 in. (305 mm) of hose.	If not, replace the defective (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006).
crimps	Not serviceable	Replace the PS12 line (Ref. AMM TASK 72-23-00-000-006) and (Ref. AMM TASK 72-23-00-400-006). PRE 72-338 POST 72-308 Inspection/Check of the PS12 Line (Configuration 2) ** ON A/C NOT FOR ALL
2.Inspect the tubes for:
Splits, cracks or kinks	Not serviceable	Replace the defective tube (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006).
Wrinkles in bends	Depth must not to be more than 15 percent of nominal tube diameter	If not, replace the defective tube (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006).
Dents	6 per lineal foot, spaced at least 0.25 in. (6.4 mm) edge to edge, if the depth of each dent is more than 30 percent of the tube outer diameter and radius is not less than 2 times the wall thickness. Also, dents in shrouds must not touch the inner tube.	If not, replace the defective tube (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006).
Flat areas	Lenght must not be greater than 3 times the tube outer diameter. Contour change must be more than 20 percent of the tube outer diameter.	If not, replace the defective tube (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006).
Nicks, scratches, chafing, or scores in straight section and bends	0.005 in. (0.13 mm) in depth.	If not, replace the defective tube (Ref. AMM TASK 72-23-00-000-006) (Ref. AMM TASK 72-23-00-400-006). END OF SB 72-308 END OF SB 72-338
3.Inspect the PS12 flexible line for:
Missing or broken port	Not serviceable
Wear	Any amount, provided no worn out through the flexible tube

Subtask 72-23-00-210-054-A ** ON A/C NOT FOR ALL

B. Visual Inspection of the PS12 Line

Inspection/Check of the PS12 Line (Configuration One) ** ON A/C NOT FOR ALL

CAUTION: USE 2 WRENCHES TO REMOVE/INSTALL THE TUBE UNION NUT: ONE TO HOLD THE FITTING, THE OTHER TO LOOSE/TORQUE THE NUT. OTHERWISE, DAMAGE TO THE HARDWARE CAN OCCUR.

(1) Inspect the PS12 hose connections as follows:
(a) Cut and remove the lockwires.
(b) Disconnect the PS12 hose from the ECU and from the fan frame bosses.
(c) Inspect the connections as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Fitting nuts for:
damaged corners	Any amount, provided proper torque can be obtained.
damaged threads	Any amount, provided effective threads are not reduced by more than one after chasing.	Chase the threads.
safetywire hole deformation and wear.	Serviceable, provided metal around hole is not cracked or torn.
2.Fittings seating surfaces for:
circumferential scratches	Any amount not detectable with a 0.04 in. (1 mm) radius ball scribe.
axial scratches	Not serviceable	Replace the hose or the part.
nicks, pits	Not serviceable	Replace the hose or the part.

(2) Clean the weep holes with isopropyl alcohol (Material No.CP1041) and WIRE - PLASTIC.
(3) Blow clean dry air into the PS12 connection to ECU to remove any dirt or water accumulation. Blocked hose is not serviceable. If necessary, replace the hose (Ref. AMM TASK 72-23-00-000-006) and (Ref. AMM TASK 72-23-00-400-006).
(4) Check the ECU nipple for dirt. If necessary, remove the dirt with WIRE - PLASTIC. Take care to not introduce dirt inside the ECU.
(5) Check the fan frame bosses for dirt. If necessary, remove the dirt with isopropyl alcohol (Material No.CP1041) and a WIRE - PLASTIC. Blow clean dry air into the fan frame bosses nipples.
(6) Lubricate the ECU and the fan frame bosses nipples with engine fuel.
(7) Connect the PS12 line to the ECU and to the fan frame bosses.
(8) TORQUE the PS12 connections to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

.
(9) Safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

PRE SB 72-338

POST SB 72-308

Inspection/Check of the PS12 Line (Configuration 2) ** ON A/C NOT FOR ALL

(10) Check the PS12 tubes connecting nuts for presence of safetywire. If the safetywires are missing, TORQUE the connecting nuts to between 150 and 135 lbf.in (1.70 and 1.53 m.daN )

and safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

5. Close-up
Subtask 72-23-00-410-074-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 fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(3) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(4) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:33:43 UTC