W DOC AIRBUS | AMM A320F

Removal of the Power Plant with Cobra Tool [CFMB]

TASK 71-00-00-000-042-A-02
Removal of the Power Plant with Cobra Tool

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
  • THE FLIGHT CONTROLS
  • THE FLIGHT CONTROL SURFACES
  • THE LANDING GEAR AND THE RELATED DOORS
  • COMPONENTS THAT MOVE.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
This task gives the information for the removal of the Power Plant with Cobra Tool.
The power plant can be removed in particular configuration. It is allowed to remove the power plant with or without the air intake cowl installed.
NOTE: Interferences between the LPTACC Inlet Airscoop assy and the Thrust reverser cowl have been observed in production on a limited number of A320 Family aircraft powered with CFM56-5B/3 engines. CFM has issued SB CFM56-5B S/B 75-0044. In order to recover the gap between the LPTACC scoop and the Thrust reverser cowl to avoid potential interference, Airbus recommends to incorporate this SB at the opportunity of Engine Removal/Installation.
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
CONTAINER 4 L (1 USGAL)
No specific
AR
COVER - PROTECTION
No specific
AR
PLIERS - NOSE, SOFT, LONG
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
TAPE - ADHESIVE
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 55 and 45 lbf.in (0.62 and 0.51 m.daN ) T
98D27803500001
1
LOCKING TOOL ZERO POS
EC004-003
1

ED005-002
1

S587-2BH0
1
BRACE - HOLD OPEN COWLS
SG233-001
1
SAFETY DEVICE
SG233-050
1
BEAM FOR SAFETY DEVICE
TMHBS10-10-00
1
BRACE-HOLD OPEN COWLS
TP91G1A1A0A
1
COBRA TOOL
 B. Consumable Materials
REFERENCE
DESIGNATION
(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, 451AL, 452AR, 473AL, 473AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR, 483AL, 483AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 05-57-00-200-001-C
Aircraft Stability
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 27-80-00-866-005-A
Retracting the Slats on the Ground
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 31-36-00-740-015-A
Printout of the Engine/APU Hours and Cycles Stored in the Flight Data Interface and Management Unit (FDIMU)
TASK 71-13-00-010-040-B
Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B
Closing 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
TASK 78-36-00-410-040-B
Closing of the Thrust Reverser Doors
F Fan Duct Panels and Sealing Fitting Assy
F Hold Open Cowl Braces - Installation
F Thrust Reverser Electrical Connectors
F Power Plant - Right Side
F Power Plant - Left Side
F Pneumatic System
F Cobra Tool
F Forward Engine Mount
F Aft Engine Mount
3. Job Set-up
Subtask 71-00-00-740-060-A ** ON A/C NOT FOR ALL
A. Do a print-out of the engine hours and cycles and keep the print with the engine for follow-up (Ref. AMM TASK 31-36-00-740-006) or (Ref. AMM TASK 31-36-00-740-015).
NOTE: Some tasks will possibly not be applicable depending on whether a DMU or an FDIMU is installed on the aircraft.
Subtask 71-00-00-941-121-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) Make sure that aircraft is stable (Ref. AMM TASK 05-57-00-200-001).
NOTE: If the aircraft is on jacks, make sure that it is leveled before you remove the engine.
   (2) On the center pedestal, on the ENG panel 115VU:
     (a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
   (3) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
   (4) 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).
   (5) Make sure that the slats are retracted (Ref. AMM TASK 27-80-00-866-005) and install 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
   (6) On the panel 30VU make sure that the APU BLEED pushbutton switch is released (ON legend off) and install a WARNING NOTICE(S) to tell the persons not to use it.
   (7) Put a WARNING NOTICE(S) on the HP ground connector to tell the persons not to pressurize the pneumatic system.
Subtask 71-00-00-861-102-A ** ON A/C NOT FOR ALL
C. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 71-00-00-865-145-A ** ON A/C NOT FOR ALL
WARNING: OPEN THE PROBE HEATER CIRCUIT-BREAKERS 1DA1(2), 3DA1(2,3), 4DA1(2,3) AND 5DA1(2,3) BEFORE ENG1(2)FADEC A and EIU 1(2) C/B'S 2KS1 AND 2KS2. IF YOU DO NOT OBEY THIS SEQUENCE:
  • THE PROBES WILL BECOME TOO HOT.
  • THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.
D. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
49VUANTI ICE/PROBES/AOA/14DA1D04
49VUANTI ICE/PROBES/PITOT/13DA1D02
49VUANTI ICE/RAIN/RPLNT/CAPT1DB1D01
49VUCOM/CVR/SPLY2RKE14
49VUCOM/CVR/CTL4RKE13
121VURCDR/DFDR7TUK16
121VUENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/B2WE1Q44
121VUENGINE/ENG1 AND 2 FIRE EXTIG/BTL1/SQUIB/A1WE1Q43
121VUENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/B2WE2Q42
121VUENGINE/ENG1 AND 2 FIRE EXTIG/BTL2/SQUIB/A1WE2Q41
122VUANTI ICE/WINDOWS/R4DG2W14
122VUANTI ICE/RAIN/RPLNT/F/O1DB2W11
122VUANTI ICE/WINDOWS/L4DG1X14
122VUANTI ICE/PROBES/2/TAT1DA2Y15
122VUANTI ICE/PROBES/2/PITOT3DA2Y14
122VUANTI ICE/PROBES/2/AOA4DA2Y13
122VUANTI ICE/PROBES/2/STATIC5DA2Y11
122VUANTI ICE/PROBES/3/PITOT3DA3Z16
122VUANTI ICE/PROBES/3/AOA4DA3Z15
122VUANTI ICE/PROBES/3/STATIC5DA3Z14
122VUANTI ICE/PROBES/1/STATIC5DA1Z13
122VUANTI ICE/PROBES/1/TAT1DA1Z12
FOR FIN: 1000EM1 (ENGINE1)
49VUFUEL/LP VALVE/MOT1/ENG11QGA08
49VUENGINE/1/FIRE DET/LOOP A7WD1A06
49VUENGINE/1/FADEC A/AND EIU 12KS1A04
121VUFUEL/LP VALVE/MOT2/ENG13QGM25
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
121VUENGINE/ENG1/FIRE DET/LOOP B8WD1Q38
121VUENGINE/ENG1/FADEC B/AND EIU 14KS1R41
122VUELEC/GCU/12XU1T26
122VUANTI ICE/ENG/11DN1X10
FOR FIN: 1000EM2 (ENGINE2)
49VUFUEL/LP VALVE/MOT1/ENG22QGA09
49VUENGINE/2/FIRE DET/LOOP B8WD2A07
49VUENGINE/2/FADEC A/AND EIU 22KS2A05
121VUFUEL/LP VALVE/MOT2/ENG24QGM26
121VUHYDRAULIC/HYD POWER/Y3803GXN30
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
121VUENGINE/ENG2/FADEC B/AND EIU 24KS2Q40
121VUENGINE/ENG2/FIRE DET/LOOP A7WD2Q39
122VUELEC/GCU/22XU2T27
122VUANTI ICE/ENG/21DN2W10
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
Subtask 71-00-00-865-156-A ** ON A/C NOT FOR ALL
WARNING: OPEN THE PROBE HEATER AND WINDOW HEATER CIRCUIT-BREAKERS BEFORE YOU OPEN THE PHC AND WHC CIRCUIT BREAKERS. IF YOU DO NOT OBEY THIS SEQUENCE:
  • THE PROBES WILL BECOME TOO HOT.
  • THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.
E. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUANTI ICE/PROBES/PHC/12DA1D03
122VUANTI ICE/WHC/25DG2W13
122VUANTI ICE/WHC/15DG1X13
122VUANTI ICE/PROBES/PHC/32DA3Y16
122VUANTI ICE/PROBES/PHC/22DA2Y12
Subtask 71-00-00-865-146-A ** ON A/C NOT FOR ALL
F. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VUENGINE/1/HP FUEL SOV1KC1A01
FOR FIN: 1000EM2 (ENGINE2)
49VUENGINE/2/HP FUEL SOV1KC2A02
Subtask 71-00-00-941-122-A ** ON A/C NOT FOR ALL
G. Put a WARNING NOTICE(S) on the circuit breaker 1KC1(2) to tell the persons not to open it (them).
Subtask 71-00-00-864-055-A ** ON A/C NOT FOR ALL
H. Depressurize the hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001):
   (1) FOR [1000EM1] (ENGINE-1)
Depressurize the Green hydraulic reservoir.
   (2) FOR [1000EM2] (ENGINE-2)
Depressurize the Yellow hydraulic reservoir.
Subtask 71-00-00-010-168-A ** ON A/C NOT FOR ALL
I. 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
Subtask 71-00-00-040-097-A ** ON A/C NOT FOR ALL
J. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).
Subtask 71-00-00-010-169-A ** ON A/C NOT FOR ALL
K. Get Access
CAUTION: BEFORE OPENING THE THRUST REVERSER DOORS TO THE 45 DEGREES POSITION MAKE SURE THAT THE SLATS ARE RETRACTED. IF NOT THE SLATS CAN TOUCH THE INBOARD THRUST REVERSER DOOR.
   (1) Open the thrust reverser doors to the 45 degrees position (Ref. AMM TASK 78-36-00-010-040):
   (2) FOR [1000EM1] (ENGINE-1)
451AL 452AR
   (3) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 71-00-00-941-123-A ** ON A/C NOT FOR ALL
L. Put the ACCESS PLATFORM 1M(3 FT) in position at the engine level.
   (1) At the half upper part of the fan frame seal the fan duct panels with TAPE - ADHESIVE
F Fan Duct Panels and Sealing Fitting Assy ** ON A/C NOT FOR ALL
Subtask 71-00-00-480-078-A ** ON A/C NOT FOR ALL
M. Retract Fan and Thrust Hold Open Rods
   (1) Install S587-2BH0 BRACE - HOLD OPEN COWLS or TMHBS10-10-00 BRACE-HOLD OPEN COWLS to support the fan and thrust reverser cowl doors.
F Hold Open Cowl Braces - Installation ** ON A/C NOT FOR ALL
   (2) Retract the fan cowl hold open rods (Ref. AMM TASK 71-13-00-410-040).
   (3) Retract the thrust reverser doors hold open rods (Ref. AMM TASK 78-36-00-410-040).
Subtask 71-00-00-680-059-A ** ON A/C NOT FOR ALL
N. Drain the remaining fuel from the engine and the pylon fuel hose at the fuel filter as follows :
F Thrust Reverser Electrical Connectors ** ON A/C NOT FOR ALL
   (1) Put a CONTAINER 4 L (1 USGAL) under the fuel filter.
   (2) Cut and remove the lockwire or safety cable and remove the drain plug from the filter bowl. Drain the fuel into the container.
   (3) Install the drain plug and TORQUE to between 55 and 45 lbf.in (0.62 and 0.51 m.daN ) T. Safety with CP8001lockwire 0.032 in. (0.8 mm) dia., or CP8002lockwire 0.032 in. (0.8 mm) dia.
Subtask 71-00-00-010-170-G ** ON A/C NOT FOR ALL
O. Remove the components:
   (1) At the rear of the drain mast remove the drain tube.
   (2) Remove the access panels :
   (3) FOR [1000EM1] (ENGINE-1)
473AL 473AR
   (4) FOR [1000EM2] (ENGINE-2)
483AL 483AR
   (5) Remove these components from the right side of the engine :
     (a) Disconnect the electrical connectors 450VCA, 452VCA, 454VCA, and 457VCA from the aft pylon junction box.
F Thrust Reverser Electrical Connectors ** ON A/C NOT FOR ALL
NOTE: If necessary, use the PLIERS - NOSE, SOFT, LONG to loosen the electrical connectors.
     (b) Remove the two clamps which attach the core harness to the pylon and keep them attached to the harness.
NOTE: Two clamp sizes can be found depending of the core harness diameter. To make sure that the correct clamps are installed, keep the clamps attached to the harness.
     (c) Disconnect the generator harness connector 400VCA from the forward pylon junction box.
F Power Plant - Right Side ** ON A/C NOT FOR ALL
     (d) Disconnect the thrust reverser harness connectors 4101KSB, 4101KSA and 4102KSA from the thrust reverser hydraulic control unit.
F Power Plant - Right Side ** ON A/C NOT FOR ALL
     (e) Remove the screw (15) and nut (20) that attach the clamps (10), (25) to the bracket on the HCU.
     (f) Remove the clamp (10) from the harness for connector 4101KSB and remove the harness from the HCU.
NOTE: Loosely install the screw (15) and nut (20) on the clamp (25) and tighten with your hand.
     (g) Disconnect the electrical connectors 401VCA, 402VCA, 403VCA, 404VCA, 405VCA, 406VCA, 407VCA, 408VCA, 409VCA, 447VCA, and 448VCA from the forward pylon junction box.
F Power Plant - Right Side ** ON A/C NOT FOR ALL
     (h) Remove the coupling (5) and disconnect the upper starter duct from the pylon duct.
F Power Plant - Right Side ** ON A/C NOT FOR ALL
     (i) Install COVER - PROTECTION on the open ends of the ducts.
     (j) Install PLUG - BLANKING on the electrical connectors.
   (6) Remove these components from the left side of engine:
     (a) Disconnect the thrust reverser harness connector 4100KSA and 4100KSB from the electrical junction box.
     (b) Disconnect the coupling half on the suction hose (60), the pressure hose (55), and the upper case drain hose (50) from the fluid disconnect panel.
F Power Plant - Left Side ** ON A/C NOT FOR ALL
     (c) Disconnect hose/tube (175) from the check valve restrictor pipe interface on the HCU.
F Power Plant - Left Side ** ON A/C NOT FOR ALL
     (d) Remove the bolts (35), the washers (40) that attach the fuel/return by-pass hose (45), from the fluid disconnect panel. Remove and discard the gasket (10).
F Power Plant - Left Side ** ON A/C NOT FOR ALL
     (e) Remove the bolts (25), the washers (30) that attach the main fuel supply hose (20) to the fluid disconnect panel. Remove and discard the gasket (15).
F Power Plant - Left Side ** ON A/C NOT FOR ALL
     (f) Install the COVER - PROTECTION on the disconnected hoses and tubes.
     (g) Disconnection of the tubes:
CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:
  • ONE WRENCH TO HOLD THE UNION, AND
  • ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.
THIS PREVENTS DAMAGE TO THE PARTS.
       1 Disconnect the sense tubes (75), (77) and (80) from the pylon interface tubes.
F Pneumatic System ** ON A/C NOT FOR ALL
       2 Disconnect the pressure tube (70) from the union installed in the upper high-pressure manifold duct (engine 1 only).
F Pneumatic System ** ON A/C NOT FOR ALL
       3 Remove the coupling (65) and disconnect the pylon interface duct from the pylon duct.
F Pneumatic System ** ON A/C NOT FOR ALL
Subtask 71-00-00-480-079-A ** ON A/C NOT FOR ALL
P. Prepare and install the STAND,TRANSPORTATION CRADLE-ENGINE and TROLLEY - ENGINE) and Cobra tool (1).
F Cobra Tool ** ON A/C NOT FOR ALL
NOTE: Engine contour given for exemple, should differ from real configuration
NOTE: You must also obey the instruction provided by the STAND,TRANSPORTATION and Cobra tool Manufacturer's Instruction Manuals.
NOTE: Airbus recommends to use safety device (SG233-001 and SG233-050) (2).
   (1) Install the fork tube (3) on the STAND,TRANSPORTATION EC004-003 and ED005-002 in a clear area.
   (2) Move the STAND,TRANSPORTATION in the engine area, under the power plant.
     (a) The complete stand must be aligned in X and Y axis. The X position is managed with a plumb line attached to the pylon mount (rear or front) and targeting the engine. The Y position is managed by a tape on ground, near the 4 stand wheels. Install TAPE - ADHESIVE on ground, on front of the wheel access of the STAND,TRANSPORTATION.
     (b) Insert the lift adapters to the STAND,TRANSPORTATION.
     (c) Position the Cobra tool (1) TP91G1A1A0A COBRA TOOL in the engine area.
     (d) Connect the lift adapters to the Cobra chains.
     (e) Align the Cobra tool (1) with the STAND,TRANSPORTATION.
     (f) Connect the hose package (electrical + hydraulic) to the Cobra tool (master and slave unit).
NOTE: Keep always the master unit out of the lifting device area.
     (g) Set parameters:
  • Select the engine and shipping stand combination.
  • Check preload values for correct operation, 56 kg (123 lb) on the forward pillars and 344 kg (758 lb) on the rear pillards.
     (h) Lift the STAND,TRANSPORTATION with Cobra tool (1) up to 300 mm (11.8110 in.).
     (i) If used, install the safety device SG233-001 SAFETY DEVICE and SG233-050 BEAM FOR SAFETY DEVICE (2).
     (j) Lift the STAND,TRANSPORTATION until 50 mm (1.9685 in.) between the cradle-stand and the engine trunnion.
     (k) If used, lock the satety device (2) in position.
     (l) Adjust position of the STAND,TRANSPORTATION to be in contact with the engine trunnion.
     (m) Connect engine trunnions.
     (n) Adjust position of the safety device (2) to be in contact with the STAND,TRANSPORTATION.
   (3) Monitor loads in order to not exceed 1586 daN (3565 lbf) on the forward Cobra Tool and 1585 daN (3563 lbf) on the aft Cobra tool.
NOTE: These loads include the preload defined previously.
4. Procedure
Subtask 71-00-00-020-087-A ** ON A/C NOT FOR ALL
A. Remove the bolts of the engine mounts
WARNING: BEFORE YOU REMOVE THE POWER PLANT, MAKE SURE THAT ALL PERSONNEL IS AWAY FROM THE AIRCRAFT. THE POWER PLANT WEIGHS APPROXIMATELY 6280 POUNDS (2850 KG). IF IT FALLS ON PERSONS, INJURY OR DEATH CAN OCCUR.
   (1) Remove the bolts (100), the washers (105) and (115), and nuts (110) that attach the nut retainers (125).
F Forward Engine Mount ** ON A/C NOT FOR ALL
   (2) Cut and remove the lockwire or safety cable.
   (3) Remove the bolts (85), washers (90), nuts (120) that attach the forward engine mount (95) to the pylon.
F Forward Engine Mount ** ON A/C NOT FOR ALL
   (4) Remove the bolts (135) and washers (140) that attach the aft engine mount (145) to the pylon.
F Aft Engine Mount ** ON A/C NOT FOR ALL
Subtask 71-00-00-869-323-A ** ON A/C NOT FOR ALL
B. Make sure that no lines or unions stay connected to the pylon.
Subtask 71-00-00-020-088-A ** ON A/C NOT FOR ALL
CAUTION: OBEY THESE PRECAUTIONS WHEN YOU TOW OR MOVE THE AIRCRAFT ON THE GROUND WITH THE ENGINE REMOVED:
  • THE THRUST REVERSER MUST BE REMOVED.
  • THE FAN COWLS MUST BE REMOVED.
  • THE SPEED OF THE AIRCRAFT MUST BE 2 KM/H OR SLOWER.
IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO THE NACELLE STRUCTURE.
C. Remove the engine.
NOTE: When you lower the engine, check that the assembly is level and never in a nose down attitude.
[Rev.9 from 2019] 2026.04.02 06:32:10 UTC
"WTRUIB" 2025