DOC AIRBUS | AMM A320FInstallation of the Hydro Mechanical Unit (HMU) Drain Tube [CFMI]
TASK 71-73-49-400-046-A
Installation of the Hydro Mechanical Unit (HMU) Drain Tube
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 71-73-49-860-071-A ** ON A/C NOT FOR ALL
Subtask 71-73-49-420-078-A ** ON A/C NOT FOR ALL
Subtask 71-73-49-410-079-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:55:10 UTC
Installation of the Hydro Mechanical Unit (HMU) Drain Tube
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-A | Closing of the Fan Cowl Doors |
Tubes - Oil, Hydraulic and Water DrainSubtask 71-73-49-860-071-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 71-73-49-010-110-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 71-73-49-420-078-A ** ON A/C NOT FOR ALL
A. Installation of the Hydro-Mechanical-Unit (HMU) Drain Tube.
(1) Remove the protective covers from the hydro mechanical unit, the tube (75), and the tube (80).
(2) Connect the hydro mechanical unit drain tube (80) to the hydro mechanical unit (HMU). Do not torque the coupling at this time.
(3) Put the clamp (85) on the tube (80) and attach it to the clamp (90) on the wire harness with the bolt, washer and nut.
(4) Connect the hydro mechanical unit drain tube (80) to the heat exchanger tube (75). Do not torque the coupling at this time.
(5) Make sure that the hydro mechanical unit drain tube (80) is aligned correctly on the engine.
(6) TORQUE the coupling nuts on the two ends of the hydro mechanical unit drain tube (80) to between 160 and 150 lbf.in (1.81 and 1.70 m.daN )
.
Subtask 71-73-49-420-078-B ** ON A/C NOT FOR ALL (1) Remove the protective covers from the hydro mechanical unit, the tube (75), and the tube (80).
(2) Connect the hydro mechanical unit drain tube (80) to the hydro mechanical unit (HMU). Do not torque the coupling at this time.
(3) Put the clamp (85) on the tube (80) and attach it to the clamp (90) on the wire harness with the bolt, washer and nut.
(4) Connect the hydro mechanical unit drain tube (80) to the heat exchanger tube (75). Do not torque the coupling at this time.
(5) Make sure that the hydro mechanical unit drain tube (80) is aligned correctly on the engine.
(6) TORQUE the coupling nuts on the two ends of the hydro mechanical unit drain tube (80) to between 160 and 150 lbf.in (1.81 and 1.70 m.daN )
. A. Installation of the Hydro Mechanical Unit (HMU) Drain Tube
(1) Remove the protective covers from the hydro mechanical unit, the heat exchanger drain tube (75), and the hydro mechanical unit drain tube (80).
(2) Connect the hydro mechanical unit drain tube (80) to the hydro mechanical unit (HMU). Do not torque the coupling at this time.
(3) Put the clamp (85) on the hydro mechanical unit drain tube (80) and attach it to the support tube bracket with the bolt (12), washers (15) and (17), and nut (23).
(4) Put the clamp (85) on the hydro mechanical unit drain tube (80) and attach it to the hydro mechanical unit bracket with the bolt (13) and nut (23).
(5) Connect the hydro mechanical unit drain tube (80) to the heat exchanger tube (75). Do not torque the coupling at this time.
(6) Make sure that the hydro mechanical unit drain tube (80) is aligned correctly on the engine.
(7) TORQUE the nut (23) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN ).
(8) TORQUE the couplings on the two ends of the hydro mechanical unit drain tube (80) to between 160 and 150 lbf.in (1.81 and 1.70 m.daN ).
5. Close-up(1) Remove the protective covers from the hydro mechanical unit, the heat exchanger drain tube (75), and the hydro mechanical unit drain tube (80).
(2) Connect the hydro mechanical unit drain tube (80) to the hydro mechanical unit (HMU). Do not torque the coupling at this time.
(3) Put the clamp (85) on the hydro mechanical unit drain tube (80) and attach it to the support tube bracket with the bolt (12), washers (15) and (17), and nut (23).
(4) Put the clamp (85) on the hydro mechanical unit drain tube (80) and attach it to the hydro mechanical unit bracket with the bolt (13) and nut (23).
(5) Connect the hydro mechanical unit drain tube (80) to the heat exchanger tube (75). Do not torque the coupling at this time.
(6) Make sure that the hydro mechanical unit drain tube (80) is aligned correctly on the engine.
(7) TORQUE the nut (23) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
. (8) TORQUE the couplings on the two ends of the hydro mechanical unit drain tube (80) to between 160 and 150 lbf.in (1.81 and 1.70 m.daN )
. Subtask 71-73-49-410-079-A ** ON A/C NOT FOR ALL