DOC AIRBUS | AMM A320FInstallation of the Seat-to-Seat Cables
TASK 25-21-61-400-001-A
Installation of the Seat-to-Seat Cables
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 25-21-61-860-050-A ** ON A/C NOT FOR ALL
Subtask 25-21-61-420-050-M ** ON A/C NOT FOR ALL
Subtask 25-21-61-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.03.31 23:30:39 UTC
Installation of the Seat-to-Seat Cables
ZONE: 200
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CAP - PROTECTION |
| No specific | 1 | ROLLER - RUBBER |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.05NCA2) | Adhesive Transfer Tape-Non Textile Floor - - |
| (Material No.05PCB2) | Double Sided Adhesive Tape-Carpet Bonding - - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| No specific | CABLE TIES |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 200 | UPPER HALF FUSELAGE |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 23-33-00-710-005-A | Operational Test of the Integrated In-Flight Entertainment (IFE) System |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
| TASK 25-21-00-710-002-A | Operational Test of the In-Seat Power-Supply System (PED Power Supply) |
| TASK 25-23-44-000-001-A | Removal of the Lower Sidewall Panels (Dado Panels) |
| TASK 25-23-44-400-001-A | Installation of the Lower Sidewall Panels (Dado Panels) |
Cables - Seat to SeatSubtask 25-21-61-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
Subtask 25-21-61-860-050-C ** ON A/C NOT FOR ALL (1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the lower sidewall panels at the locations of the power wall disconnect-boxes are removed (Ref. AMM TASK 25-23-44-000-001).
Subtask 25-21-61-865-057-A ** ON A/C NOT FOR ALL (1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the lower sidewall panels at the locations of the power wall disconnect-boxes are removed (Ref. AMM TASK 25-23-44-000-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 25-21-61-210-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE-IFEC-AC | 22MK | C04 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE/SEAT-POWER-PAX SYS | 20MK | D08 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | INSEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | INSEAT POWER-MCU 1 | 58HP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE-IFEC-AC | 22MK | C06 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | SEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | SEAT POWER-MCU 1 | 58HP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC - CTL | 21MK | D01 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC-CABIN AFT-RH | 25MK | D05 |
| 2000VU | PES-MUSIC-CABIN AFT-LH | 22MK | D04 |
| 2000VU | PES-MUSIC-CABIN FWD-RH | 24MK | D03 |
| 2000VU | PES-MUSIC-CABIN FWD-LH | 23MK | D02 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC-CTL | 21MK | D01 |
C. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
4. Procedure(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
Subtask 25-21-61-420-050-M ** ON A/C NOT FOR ALL
A. Installation of the Cables - Seat to Seat
(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Install the cables:
(a) Start at the power wall disconnect-boxes to install the cables (3).
(b) Make sure that all cables have protective sleeves (15) at the curves and the front studs of the passenger seats and at the wall disconnect boxes.
(c) Carefully put the cables (3) in position.
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (3) and put them into the covers of the electronic boxes.
(f) Install new CABLE TIES (13).
(3) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (10) to the power wall disconnect-boxes.
(d) Put the clamps (6) in position and install the screws (5).
(e) Put the brackets (7) in position and install the screws (8).
(f) Connect the electrical connectors (4) to the electronic boxes.
(g) Make sure that all not used connectors have a CAP - PROTECTION.
(4) Install the covers:
(a) Install the cable outlets (16) on the race ways.
(b) Close the covers (14).
(c) Install the covers (12) and (11) on the race ways.
(d) Install the applicable seat track covers (17) on the seat tracks.
(e) Close the race way covers (9).
(f) Install the removed carpet with Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(g) Put the covers (1) in position and lock the fasteners (2).
(h) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-61-420-050-S ** ON A/C NOT FOR ALL (1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Install the cables:
(a) Start at the power wall disconnect-boxes to install the cables (3).
(b) Make sure that all cables have protective sleeves (15) at the curves and the front studs of the passenger seats and at the wall disconnect boxes.
(c) Carefully put the cables (3) in position.
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (3) and put them into the covers of the electronic boxes.
(f) Install new CABLE TIES (13).
(3) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (10) to the power wall disconnect-boxes.
(d) Put the clamps (6) in position and install the screws (5).
(e) Put the brackets (7) in position and install the screws (8).
(f) Connect the electrical connectors (4) to the electronic boxes.
(g) Make sure that all not used connectors have a CAP - PROTECTION.
(4) Install the covers:
(a) Install the cable outlets (16) on the race ways.
(b) Close the covers (14).
(c) Install the covers (12) and (11) on the race ways.
(d) Install the applicable seat track covers (17) on the seat tracks.
(e) Close the race way covers (9).
(f) Install the removed carpet with Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(g) Put the covers (1) in position and lock the fasteners (2).
(h) Make sure that the work area is clean and clear of tools and other items.
A. Installation of the Cables - Seat to Seat
(1) Install the cables:
(a) Start at the wall disconnect boxes to install the cables (6).
(b) Make sure that all cables have protective sleeves (4) with cable ties (5) at:
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (6) and put them into the covers of the seat electronic boxes.
(f) Install new CABLE TIES (5).
(2) Connect the electrical connectors:
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (7) to the wall disconnect boxes.
(d) Connect the electrical connectors (10) to the seat electronic boxes.
(e) Lock the electrical connectors (7) and (10) with the spring latches (3).
(f) Install a terminator 101MK on the connectors J2 that are not used at the seat electronic boxes.
(g) Lock the terminator 101MK with the spring latches (3).
(h) Make sure that all not used connectors have a CAP - PROTECTION.
(3) Install the covers:
(a) Install the cable outlets (15) on the race ways.
(b) Close the covers (14).
(c) Install the covers (13) and (12) on the race ways.
(d) Install the seat track covers (16) on the seat tracks.
(e) Close the race ways (11).
(f) Install the removed carpet with double sided tape Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(g) Put the covers (9) in position and lock the fasteners (8) on the wall disconnect boxes.
(h) Put the covers (1) in position and lock the fasteners (2).
(4) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-61-420-050-CV ** ON A/C NOT FOR ALL (1) Install the cables:
(a) Start at the wall disconnect boxes to install the cables (6).
(b) Make sure that all cables have protective sleeves (4) with cable ties (5) at:
- The curves
- The front studs of the passenger seats
- The wall disconnect boxes.
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (6) and put them into the covers of the seat electronic boxes.
(f) Install new CABLE TIES (5).
(2) Connect the electrical connectors:
CAUTION:
MAKE SURE THAT THE SPRING LATCHES CORRECTLY HOLD THE CONNECTOR IN THE FULLY ENGAGED POSITION. THE SPRING LATCHES PREVENT UNWANTED MOVEMENT OF THE CONNECTOR, AND THUS THE RISK OF ARCING, WHICH CAN CAUSE DAMAGE TO THE UNIT.
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (7) to the wall disconnect boxes.
(d) Connect the electrical connectors (10) to the seat electronic boxes.
(e) Lock the electrical connectors (7) and (10) with the spring latches (3).
(f) Install a terminator 101MK on the connectors J2 that are not used at the seat electronic boxes.
(g) Lock the terminator 101MK with the spring latches (3).
(h) Make sure that all not used connectors have a CAP - PROTECTION.
(3) Install the covers:
(a) Install the cable outlets (15) on the race ways.
(b) Close the covers (14).
(c) Install the covers (13) and (12) on the race ways.
(d) Install the seat track covers (16) on the seat tracks.
(e) Close the race ways (11).
(f) Install the removed carpet with double sided tape Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(g) Put the covers (9) in position and lock the fasteners (8) on the wall disconnect boxes.
(h) Put the covers (1) in position and lock the fasteners (2).
(4) Make sure that the work area is clean and clear of tools and other items.
A. Installation of the Cables - Seat to Seat
(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Install the cables:
(a) Start at the power wall disconnect-boxes to install the cables (6).
(b) Make sure that all cables have protective sleeves (3) at the curves.
(c) Carefully put the cables (6) in position.
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (6) and put them into the covers of the electronic boxes.
(f) Lock the cables (6) into the clamps (7), if necessary.
(g) Install new CABLE TIES (4).
(3) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (13) to the power wall disconnect-boxes.
(d) Put the clamps (9) in position and install the screws (8).
(e) Put the brackets (10) in position and install the screws (11).
(f) Connect the electrical connectors (5) to the brackets.
(g) Make sure that all not used connectors have a CAP - PROTECTION.
(4) Install the covers:
(a) Close the covers (16).
(b) Install the cable outlets (17) and the covers (15), (14) on the race ways.
(c) Install the applicable seat track covers (18) on the seat tracks.
(d) Close the race way covers (12).
(e) Install the removed carpet with double sided tape Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(5) Put the covers (1) in position and lock the fasteners (2).
(6) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-61-420-050-PE ** ON A/C NOT FOR ALL (1) When you connect/install the components, refer to the match marks made during the removal procedure.
(2) Install the cables:
(a) Start at the power wall disconnect-boxes to install the cables (6).
(b) Make sure that all cables have protective sleeves (3) at the curves.
(c) Carefully put the cables (6) in position.
(d) Make sure that the over length of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the over lengths of the cables (6) and put them into the covers of the electronic boxes.
(f) Lock the cables (6) into the clamps (7), if necessary.
(g) Install new CABLE TIES (4).
(3) Connect the electrical connectors:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (13) to the power wall disconnect-boxes.
(d) Put the clamps (9) in position and install the screws (8).
(e) Put the brackets (10) in position and install the screws (11).
(f) Connect the electrical connectors (5) to the brackets.
(g) Make sure that all not used connectors have a CAP - PROTECTION.
(4) Install the covers:
(a) Close the covers (16).
(b) Install the cable outlets (17) and the covers (15), (14) on the race ways.
(c) Install the applicable seat track covers (18) on the seat tracks.
(d) Close the race way covers (12).
(e) Install the removed carpet with double sided tape Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(5) Put the covers (1) in position and lock the fasteners (2).
(6) Make sure that the work area is clean and clear of tools and other items.
A. Installation of the Seat-to-Seat Cables
(1) When you connect/install the components, refer to the match marks made during the removal procedure.
(a) Start at the power wall disconnect-box to install the cables (6).
(b) Make sure that all cables have protective sleeves (8) installed at the curves.
(c) Carefully put the cables (6) in position as recorded during the removal procedure.
(d) Make sure that the overlength of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the overlength of the cables (6) and put them into the covers of the related seats.
(f) Close the clamps (16).
(g) Install the new CABLE TIES (7).
(3) Connect the electrical connectors as follows:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (22) to the power wall disconnect-box.
(d) Put the clamps (19) in position and install the screws (18).
(e) Tighten the screws (18).
(f) Put the bracket (21) in position and install the screws (20).
(g) Tighten the screws (20).
(h) Connect the electrical connector (17) to the bracket.
(i) Connect the electrical connectors (15) to the In-Seat Power Supply Unit (ISPSU).
(j) Make sure that all not used electrical connectors have a CAP - PROTECTION.
(4) Install the covers as follows:
(a) Close the covers (24).
(b) Install the covers (25) and (26) and the cable outlets (27) on the raceway.
(c) Install the applicable seat track cover (28) on the seat track.
(d) Close the raceway covers (23).
(e) Put the carpet in position and attach it with Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(f) On the tourist class seat, put the covers (11) and (13) in position and engage the fasteners (12) and (14).
(g) On the Business Class (B/C) seat:
1 Put the covers (4) and (9) in position and engage the fasteners (5) and (10).
2 Put the cover (3) in position and install the washer (2) and screw (1).
3 Tighten the screw (1).
(5) Make sure that the work area is clean and clear of tools and other items.
Subtask 25-21-61-420-051-A ** ON A/C NOT FOR ALL (1) When you connect/install the components, refer to the match marks made during the removal procedure.
CAUTION:
MAKE SURE THAT YOU INSTALL THE ELECTRICAL CABLES IN THE CORRECT POSITION INTO THE CABLE CHANNEL. DO NOT MAKE KINKS IN THE CABLES, MAKE A LOOP IN THEM TO PREVENT DAMAGE TO THE COMPONENTS.
CAUTION:
MAKE SURE THAT THE ELECTRICAL CABLES ARE IN THE CORRECT CONDITION. IF THEY ARE NOT, REPLACE THEM IMMEDIATELY. DAMAGED CABLES CAN CAUSE DAMAGE TO OR FAILURE OF THE EQUIPMENT.
(2) Install the cables (6) as follows:(a) Start at the power wall disconnect-box to install the cables (6).
(b) Make sure that all cables have protective sleeves (8) installed at the curves.
(c) Carefully put the cables (6) in position as recorded during the removal procedure.
(d) Make sure that the overlength of each cable is less than 250 mm (9.8425 in.).
(e) Make loops with the overlength of the cables (6) and put them into the covers of the related seats.
(f) Close the clamps (16).
(g) Install the new CABLE TIES (7).
(3) Connect the electrical connectors as follows:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connectors (22) to the power wall disconnect-box.
(d) Put the clamps (19) in position and install the screws (18).
(e) Tighten the screws (18).
(f) Put the bracket (21) in position and install the screws (20).
(g) Tighten the screws (20).
(h) Connect the electrical connector (17) to the bracket.
(i) Connect the electrical connectors (15) to the In-Seat Power Supply Unit (ISPSU).
(j) Make sure that all not used electrical connectors have a CAP - PROTECTION.
(4) Install the covers as follows:
(a) Close the covers (24).
(b) Install the covers (25) and (26) and the cable outlets (27) on the raceway.
(c) Install the applicable seat track cover (28) on the seat track.
(d) Close the raceway covers (23).
(e) Put the carpet in position and attach it with Double Sided Adhesive Tape-Carpet Bonding - - (Material No.05PCB2) .
(f) On the tourist class seat, put the covers (11) and (13) in position and engage the fasteners (12) and (14).
(g) On the Business Class (B/C) seat:
1 Put the covers (4) and (9) in position and engage the fasteners (5) and (10).
2 Put the cover (3) in position and install the washer (2) and screw (1).
3 Tighten the screw (1).
(5) Make sure that the work area is clean and clear of tools and other items.
B. Installation of the Raceway
(1) If you removed the raceway (1) install it:
(b) Make sure that the raceway (1) has the correct dimension.
(c) Unwind the Adhesive Transfer Tape-Non Textile Floor - - (Material No.05NCA2) (2).
(d) Align the self-adhesive layer (2) with the raceway (1). Install it with the Textile-Lint free Cotton - (Material No.14SBA1) and a light pressure of your hand.
(e) Cut the self-adhesive layer (2) to the same dimension as the raceway (1).
(f) Push the self-adhesive layer (2) down with the ROLLER - RUBBER.
(g) Remove the protective paper from the attached self-adhesive layer (2).
(h) Put the raceway (1) into the correct position.
(i) Install the raceway (1) on the floor panels with the Textile-Lint free Cotton - (Material No.14SBA1) and apply a light pressure manually.
Subtask 25-21-61-865-052-A ** ON A/C NOT FOR ALL (1) If you removed the raceway (1) install it:
CAUTION:
DO NOT CAUSE DAMAGE TO THE SURFACES. THE COMPONENTS ARE MADE OF CARBONFIBER REINFORCED PLASTIC.
(a) Clean the component interfaces and the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and the Textile-Lint free Cotton - (Material No.14SBA1) . (b) Make sure that the raceway (1) has the correct dimension.
(c) Unwind the Adhesive Transfer Tape-Non Textile Floor - - (Material No.05NCA2) (2).
(d) Align the self-adhesive layer (2) with the raceway (1). Install it with the Textile-Lint free Cotton - (Material No.14SBA1) and a light pressure of your hand.
(e) Cut the self-adhesive layer (2) to the same dimension as the raceway (1).
(f) Push the self-adhesive layer (2) down with the ROLLER - RUBBER.
(g) Remove the protective paper from the attached self-adhesive layer (2).
(h) Put the raceway (1) into the correct position.
(i) Install the raceway (1) on the floor panels with the Textile-Lint free Cotton - (Material No.14SBA1) and apply a light pressure manually.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 25-21-61-710-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE-IFEC-AC | 22MK | C04 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE/SEAT-POWER-PAX SYS | 20MK | D08 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | INSEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | INSEAT POWER-MCU 1 | 58HP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | IFE-IFEC-AC | 22MK | C06 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | SEAT POWER-MCU 2 | 59HP | B08 |
| 2000VU | SEAT POWER-MCU 1 | 58HP | B05 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC - CTL | 21MK | D01 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC-CABIN AFT-RH | 25MK | D05 |
| 2000VU | PES-MUSIC-CABIN AFT-LH | 22MK | D04 |
| 2000VU | PES-MUSIC-CABIN FWD-RH | 24MK | D03 |
| 2000VU | PES-MUSIC-CABIN FWD-LH | 23MK | D02 |
| ** ON A/C NOT FOR ALL | |||
| 2000VU | PES-MUSIC-CTL | 21MK | D01 |
D. Test
(1) Do the operational test of the passenger entertainment system (Ref. AMM D/O 23-33-00-71).
Subtask 25-21-61-710-050-F ** ON A/C NOT FOR ALL (1) Do the operational test of the passenger entertainment system (Ref. AMM D/O 23-33-00-71).
D. Test
(1) Do the operational test of the in-seat power-supply system (Ref. AMM TASK 25-21-00-710-002).
Subtask 25-21-61-710-050-H ** ON A/C NOT FOR ALL (1) Do the operational test of the in-seat power-supply system (Ref. AMM TASK 25-21-00-710-002).
D. Test
(1) Do the operational test of the Passenger Entertainment System (Ref. AMM TASK 23-33-00-710-005).
5. Close-up(1) Do the operational test of the Passenger Entertainment System (Ref. AMM TASK 23-33-00-710-005).
Subtask 25-21-61-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Install the lower sidewall panels at the locations of the power wall disconnect-boxes (Ref. AMM TASK 25-23-44-400-001).
Subtask 25-21-61-862-050-A ** ON A/C NOT FOR ALL (1) Install the lower sidewall panels at the locations of the power wall disconnect-boxes (Ref. AMM TASK 25-23-44-400-001).