DOC AIRBUS | AMM A320FInstallation of the Instrumentation Position Pick-Off Unit
TASK 27-85-11-400-001-A
Installation of the Instrumentation Position Pick-Off Unit
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 27-85-11-860-051-A
Subtask 27-85-11-860-052-A
Subtask 27-85-11-410-050-A
[Rev.10 from 2021]
2026.04.01 06:56:48 UTC
Installation of the Instrumentation Position Pick-Off Unit
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.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
FIN: 4CN
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | Torque wrench: range to between 0.96 and 0.87 m.daN (84.96 and 76.99 lbf.in )  | |
| 98D27803000000 | 1 | LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.06LCG9) | Non Hardening Jointing Putty-Medium Temp. Area - - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| (Material No.14VGE1) | Individual Compound-- Zinc Powder - |
| (Material No.666400) | ELECOLIT 414 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 27-00-00-080-002-A | Removal of the Flap/Slat Control-Lever Locking Tool (98D27803000000) |
| TASK 27-00-00-480-002-A | Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000) |
| TASK 27-80-00-866-005-A | Retracting the Slats on the Ground |
| TASK 27-84-00-710-001-A | Operational Test of the Slat System |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
| TASK 34-13-00-710-007-A | Operational Check of Overspeed Warnings VFE/VLE Using CFDS |
Electrical Bonding Area of the IPPUSubtask 27-85-11-860-051-A
A. Aircraft Maintenance Configuration
(1) Make sure that the main doors of the main gear are open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the opening of the main door of the main gear.
(3) Make sure that the slats are in the retracted position (Ref. AMM TASK 27-80-00-866-005) because a new IPPU is delivered locked in its zero position.
(4) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is installed on the slat/flap control lever (Ref. AMM TASK 27-00-00-480-002).
Subtask 27-85-11-865-051-A (1) Make sure that the main doors of the main gear are open (Ref. AMM TASK 32-12-00-010-001).
(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position at the opening of the main door of the main gear.
(3) Make sure that the slats are in the retracted position (Ref. AMM TASK 27-80-00-866-005) because a new IPPU is delivered locked in its zero position.
(4) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is installed on the slat/flap control lever (Ref. AMM TASK 27-00-00-480-002).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT FLP/POS/IND 1 | 1CN | B12 |
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B06 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT FLP/POS/IND 1 | 1CN | B07 |
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B01 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | FLIGHT CONTROLS/SLT FLP/2POS/IND | 2CN | P16 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/SLT/CTL/SYS2 | 7CV | R21 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | FLIGHT CONTROLS/SLT FLP/2POS/IND | 2CN | P21 |
Subtask 27-85-11-860-052-A
A. Preparation for Installation
(1) Do an inspection of the component interfaces and the adjacent area.
(2) Use a Textile-Lint free Cotton - (Material No.14SBA1) and the Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the:
(4) Apply a quantity of the prepared mixture or apply Elecolit 414 to the related electrical bonding areas (refer to the related figure):
(a) Make sure that you apply the material on the mating areas on the IPPU and on the differential gearbox.
(5) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the threads of the screws (1).
Subtask 27-85-11-420-050-A (1) Do an inspection of the component interfaces and the adjacent area.
(2) Use a Textile-Lint free Cotton - (Material No.14SBA1) and the Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the:
- mating area of the IPPU
- mating area of the differential gearbox.
(4) Apply a quantity of the prepared mixture or apply Elecolit 414 to the related electrical bonding areas (refer to the related figure):
(a) Make sure that you apply the material on the mating areas on the IPPU and on the differential gearbox.
(5) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the threads of the screws (1).
B. Installation of the Instrumentation Position Pick-Off Unit
(1) Make sure that all zero marks on the IPPU are aligned.
(2) Remove the tie-wrap (3).
(3) Install the IPPU carefully on the gearbox.
(4) Install the screws (1) and the washers (2).
(5) TORQUE the screws (1) to between 0.96 and 0.87 m.daN (84.96 and 76.99 lbf.in ).
(6) Do a bonding test between the main bonding point of the power control unit and the IPPU flange. The resistance must not be more than 20 milliohms.
(7) Remove the blanking caps from the electrical connectors.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the electrical connectors 4CN-A and 4CN-B to the IPPU.
Subtask 27-85-11-865-052-A (1) Make sure that all zero marks on the IPPU are aligned.
(2) Remove the tie-wrap (3).
(3) Install the IPPU carefully on the gearbox.
(4) Install the screws (1) and the washers (2).
(5) TORQUE the screws (1) to between 0.96 and 0.87 m.daN (84.96 and 76.99 lbf.in )
. (6) Do a bonding test between the main bonding point of the power control unit and the IPPU flange. The resistance must not be more than 20 milliohms.
(7) Remove the blanking caps from the electrical connectors.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Connect the electrical connectors 4CN-A and 4CN-B to the IPPU.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 27-85-11-710-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT FLP/POS/IND 1 | 1CN | B12 |
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B06 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | FLIGHT CONTROLS/SLT FLP/POS/IND 1 | 1CN | B07 |
| 49VU | FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1 | 5CV | B01 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | FLIGHT CONTROLS/SLT FLP/2POS/IND | 2CN | P16 |
| ** ON A/C ALL | |||
| 121VU | FLIGHT CONTROLS/SLT/CTL/SYS2 | 7CV | R21 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | FLIGHT CONTROLS/SLT FLP/2POS/IND | 2CN | P21 |
D. Operational Tests
(1) Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the slat/flap control lever (Ref. AMM TASK 27-00-00-080-002).
(2) Do the operational test of the slat system (Ref. AMM TASK 27-84-00-710-001).
(3) Do the operational test of the overspeed warnings in the slats/flaps and landing gear extended (VFE/VLE) configuration (Ref. AMM TASK 34-13-00-710-007).
5. Close-up(1) Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION from the slat/flap control lever (Ref. AMM TASK 27-00-00-080-002).
(2) Do the operational test of the slat system (Ref. AMM TASK 27-84-00-710-001).
(3) Do the operational test of the overspeed warnings in the slats/flaps and landing gear extended (VFE/VLE) configuration (Ref. AMM TASK 34-13-00-710-007).
Subtask 27-85-11-410-050-A
A. Close Access
(1) Remove the access platform(s).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the main doors of the main gear (Ref. AMM TASK 32-12-00-410-001).
(1) Remove the access platform(s).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the main doors of the main gear (Ref. AMM TASK 32-12-00-410-001).