Removal of the P3B Line [CFML]

TASK 73-21-70-000-803-A
Removal of the P3B Line

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.

ZONE: 436
ZONE: 446

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	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
436	FAN AND ACCESSORY GEARBOX
446	FAN AND ACCESSORY GEARBOX
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
P3B Line

3. Job Set-up
Subtask 73-21-70-941-054-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) 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.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-70-010-060-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure
Subtask 73-21-70-020-053-A

A. Removal of the P3B Line

P3B Line

(1) Removal of the safety cable

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.

(a) Cut and discard the safety cable from the coupling nuts (2).
(2) Disconnection of the PS3 line

CAUTION: USE TWO WRENCHES TO LOOSEN OR TIGHTEN THE COUPLING NUT. USE ONE WRENCH TO HOLD THE FITTING AND THE OTHER TO LOOSEN OR TIGHTEN THE COUPLING NUT. IF YOU DO NOT USE TWO WRENCHES, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Loosen the two coupling nuts (2) of the P3B line (1) from the air tube (18) and the pressure sub-system box-nipple (19).
(3) Remove the bolt (4) and the nut (3) from the clamp (5).
(4) Remove the bolt (7) and the nut (6) from the clamp (8).
(5) Remove the bolt (10) and the nut (9) from the clamp (11).
(6) Remove the bolt (12) from the clamp (13).
(7) Remove the bolt (14) from the clamp (15).
(8) Remove the bolt (16) from the clamp (17).
(9) Remove the P3B line (1).
(10) Remove the clamps (5), (8), (11), (13), (15) and (17) from the P3B line (1).
(11) Install the COVER - PROTECTION and the CAP - PROTECTION on all the openings, tubes, hoses and connectors.

[Rev.10 from 2021] 2026.04.01 03:05:44 UTC