(3) Install the washers (270) and nuts (260) on the bolts (300).
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HYDRO-MECHANICAL UNIT (HMU) - REMOVAL/INSTALLATION
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TASK 73-21-10-000-002
Removal of the Hydromechanical Unit (HMU)
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
No specific blanking cover
No specific blanking plugs
R No specific circuit breaker(s) safety clip(s) No specific container 4 l (1 USgal) No specific soft-nose pliers No specific warning notice No specific 250-28 UNF-2A x 50 in. bolts No specific access platform 1.5 m (4 ft. 11 in.) 856A1469 1 WRENCH SET, RUN ON/OFF - MEC/FUEL PUMP NUTS 856A1494 1 FIXTURE HANDLING - HMU
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
R External Power 70-21-00-918-002 Seals (Preformed Packings and O-rings) and Gaskets 71-13-00-010-040 Opening of the Fan Cowl Doors 73-21-10-600-002 Preservation of the Hydromechanical Unit (HMU) 78-30-00-481-041 Make the Thrust Reverser Unserviceable for
Maintenance
78-36-00-010-040 Opening of the Thrust Reverser Doors
73-21-10-991-302 Fig. 401
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3. Job Set-up
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Subtask 73-21-10-941-051
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice 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 to tell persons not to energize the FADEC
1(2). R
R Subtask 73-21-10-861-053
R B. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
R Subtask 73-21-10-865-052
R C. Open, safety and tag this(these) circuit breaker(s):
R -------------------------------------------------------------------------------R PANEL DESIGNATION IDENT. LOCATION R -------------------------------------------------------------------------------R 49VU FUEL/LP VALVE/MOT1/ENG2 2QG A09 R 49VU FUEL/LP VALVE/MOT1/ENG1 1QG A08
Subtask 73-21-10-010-053
R D. Get Access
(1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
(2) Put the access platform in position.
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Subtask 73-21-10-040-052
R E. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
Subtask 73-21-10-010-054
R F. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040) FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
4. Procedure
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(Ref. Fig. 401/TASK 73-21-10-991-302)
Subtask 73-21-10-020-053
A. Remove the HMU. WARNING : DO NOT PERMIT THE FUEL TO TOUCH YOUR SKIN OR CLOTHES. REMOVE
_______ YOUR CLOTHES IF THE FUEL TOUCHES THEM. RINSE YOUR SKIN FULLY WITH WATER WHERE THE FUEL TOUCHED YOU. FUEL CAN BURN YOUR SKIN.
NOTE : Put a container 4 l (1 USgal) under the HMU to catch fuel released
____
when fuel lines are disconnected.
(1) Disconnect the electrical connector (50) from the fuel flow transmitter. If necessary, use soft-nose pliers.
(2) Put blanking caps on the disconnected electrical connectors.
(3) Remove the bolt (20) and nut (40) from the loop clamp (30) that attaches the electrical connector (50) to the support bracket. Remove the loop clamp (30).
(4) Remove the bolts (100) to remove the fuel supply tube from the discharge port of the Hydromechanical Unit (HMU). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM 发动机燃油和控制 ENGINE FUEL AND CONTRO(102)
