Removal of the Rotor Active Clearance Start Bleed Valve [CFMB]

TASK 75-23-10-000-002-A
Removal of the Rotor Active Clearance Start Bleed Valve

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task is applicable for NON /P engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	AR	PLIERS - JAWED, SOFT
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
856A1612	1	WRENCH SET, SPANNER - AIRTUBE NUTS

B. 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

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 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 36-11-41-000-040-B	Removal of the Intermediate Pressure (IP) Bleed Check-Valve
TASK 36-11-49-000-045-A	Removal of the Lower High Pressure Duct
TASK 36-11-49-000-048-A	Removal of the Fifth Stage Elbow Duct
TASK 36-11-51-000-042-A	Removal of the High Pressure Bleed Valve
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
RACSB Valve
Removal/Installation of the RACSB Valve

3. Job Set-up
Subtask 75-23-10-941-052-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 75-23-10-861-051-A ** ON A/C NOT FOR ALL

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

Subtask 75-23-10-865-057-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
FOR FIN: 1000EM1 (ENGINE1)
49VU	FUEL/LP VALVE/MOT1/ENG1	1QG	A08
121VU	FUEL/LP VALVE/MOT2/ENG1	3QG	M25
FOR FIN: 1000EM2 (ENGINE2)
49VU	FUEL/LP VALVE/MOT1/ENG2	2QG	A09
121VU	FUEL/LP VALVE/MOT2/ENG2	4QG	M26

Subtask 75-23-10-010-055-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.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 75-23-10-040-054-A ** ON A/C NOT FOR ALL

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

Subtask 75-23-10-010-056-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 75-23-10-020-054-A ** ON A/C NOT FOR ALL

A. Remove parts of the customer bleed system to get access to the RACSB air tube (70) coupling nut and attachment clamp and to the upper air start tube (80) attachment points as follows:
(1) Remove the IP Bleed Check Valve (10) (Ref. AMM TASK 36-11-41-000-040).
(2) Remove the 5th Stage Elbow Duct (40) (Ref. AMM TASK 36-11-49-000-048).
(3) Remove the HP Bleed Valve (20) (Ref. AMM TASK 36-11-51-000-042).
(4) If necessary, remove the Lower High Pressure Duct (30) to get access to the attachment point of the upper air start tube to the combustion case at 9:15 o'clock (Ref. AMM TASK 36-11-49-000-045).

Subtask 75-23-10-020-053-A ** ON A/C NOT FOR ALL

B. Remove the rotor active clearance start bleed (RACSB) valve as follows:
(1) Disconnect the electrical connectors, Channel A (450) and Channel B (460) from the RACSB valve (60). Use PLIERS - JAWED, SOFT if necessary.
(2) Install CAP - BLANKING on the open ends of the electrical connectors and the electrical connectors on the RACSB valve for channel A (450) and Channel B (460).
(3) Put a CONTAINER 1 L (1/4 USGAL) below the area of the drain cap (180) and the fuel manifold (390) of the RACSB valve (60).
(4) Remove the drain cap (180) of the fuel drain tube (90). Fuel will drain into the container.
(5) Remove the fuel drain tube (90).
(6) Install PLUG - BLANKING on the drain cap fitting, on both ends of fuel drain tube (90) and on the open end of the drain tube (190).
(7) Remove the bolts (270, 280) and the spacer (290) from the RACSB air tube (70) and the RACSB valve (60).
(8) Cut the lockwire on the coupling nut of the RACSB air tube (70). Disconnect the tube sections at the coupling nut using 856A1612 WRENCH SET, SPANNER - AIRTUBE NUTS (856A1612G01).
(9) Remove the nut (610) and bolt (570) that attach the loop clamp (620) and the RACSB air tube (70) to the bracket (580).
(10) Remove the RACSB air tube (70).
(11) Remove and discard the gasket (260).
(12) Remove the 4 bolts (130) and the spacer (140) from the upper air start tube (80) and the RACSB valve (60).
(13) Remove the bolts (640), nuts (670) and washers (660) that attach the retaining strap (630) and the upper air start tube (80) to the bracket (650).
(14) Cut the lockwire and remove the bolts (560) that attach the upper air start tube (80) to the combustion case.
(15) Remove the upper air start tube (80).
(16) Remove the e-seal (550).
(17) Remove and discard the gasket (150).
(18) Remove the 4 bolts (420) from the fuel manifold (390) and remove the spacer (510) from the fuel manifold (390).
(19) Remove and discard the gasket (430) from between the fuel manifold (390) and the RACSB valve (60).
(20) Remove the 4 bolts (210) from the lower air start tube (100) and the RACSB valve (60).
(21) Remove the bolts (220, 230) from the RACSB discharge tube (110) and the RACSB valve (60).
(22) Remove and discard the gaskets (200, 240) and the orifice plate (250).
(23) Move the bracket assembly (300) away from the RACSB valve (60).

NOTE: It should not be necessary to remove items from the bracket assembly (300).

(24) If necessary, loosen the loop clamps (350, 380) that attach the fuel manifold tubes (390) by removing the bolts (370, 490) and nuts (360, 400) to get adequate clearance with the tubes when the RACSB valve is removed.
(25) Remove the RACSB valve:

CAUTION: PROVIDE SUPPORT FOR THE RACSB VALVE AS YOU REMOVE THE BOLTS TO AVOID POSSIBLE DAMAGE TO EQUIPMENT AND PERSONNEL INJURY. THE RACSB VALVE WEIGHS APPROXIMATELY 19.1 LB (8,7KG).

(a) Remove the three bolts (470) that attach the RACSB valve (60) to the bracket (410) on the core engine.
(b) Carefully remove the bolt (440) that attaches the RACSB valve to the bracket (410) on the core engine.
(c) Remove the RACSB valve (60).
(26) Install protective closures on the 5th stage and 9th stage air inlet and outlet ports of the RACSB valve (60).
(27) Install protective closures on the fuel inlet pad of the RACSB valve (60) and on the outlet pad of the fuel manifold (390).
(28) Remove the nipple (170) from the RACSB valve drain port and set aside for use on the new RACSB valve.
(29) Remove and discard the O-ring (160).
(30) Install a PLUG - BLANKING on the fuel drain port of the RACSB valve (60).

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