3. Job Set-up
__________
 Subtask 78-31-49-941-088

 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).

 Subtask 78-31-49-010-122
 B. 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
 Subtask 78-31-49-040-114

 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041)
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 4. Procedure
_________
 (Ref. Fig. 414/TASK 78-31-49-991-315)
 Subtask 78-31-49-020-086

 A. Removal of the Head Supply Junction Pipe
 (1) Put a container 1 USgal (4 L) under the lower hydraulic actuator.

 (2) Disconnect the lower head supply hose from the actuator and let the hydraulic fluid drain into the container.

 (3) Connect the lower rod supply hose to the actuator.

 (4) TORQUE the coupling nut to between 235 and 260 lbf.in (2.65 and 2.93 m.daN).

 NOTE : Apply a witness line of finish paint EA4 blue 5991 (Material
____ No. CP2245) on the nut and connection after they are torqued.
 (5) Remove the nuts and the bolts that attach the double flange and the upper half clamps to the double hydraulic line bracket.

 (6) Loosen the bottom bolt that attach the upper half clamp to the middle hydraulic line bracket. Remove the top bolt and the upper head shield.

 (7) Remove nuts and bolts that attach the lower head shield to the forward frame.

 (8) Remove the nut that attach the head supply junction pipe to the middle hydraulic line bracket.

 (9) Disconnect the upper head supply hose from the upper head swivel joint.

 (10) Disconnect the head supply junction pipe from the lower head swivel joint.

 (11) Remove the upper head swivel joint from the head supply junction pipe.

 (12) Remove and discard the packing (10).

 (13) Put protective covers on the pipe ends.

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 Head Supply Junction Pipe
 Figure 414/TASK 78-31-49-991-315- 12 (SHEET 1)
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 Head Supply Junction Pipe
 Figure 414/TASK 78-31-49-991-315- 22 (SHEET 2)
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 TASK 78-31-49-400-028

 Installation of the Head Supply Junction Pipe
 WARNING : WEAR A FACE SHIELD WHICH IS RESISTANT TO HIGH PRESSURE JETS WHEN YOU
_______
 WORK ON PRESSURIZED SYSTEMS.

R WARNING : DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
_______ R - FLUSH IT AWAY WITH CLEAN WATER R - GET MEDICAL AID.
 CAUTION : USE 2 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 WILL PREVENT DAMAGE TO THE HARDWARE.

 CAUTION : MAKE SURE THERE IS NO UNWANTED MATERIAL IN THE PORTS AND ORIFICES OR
_______
 DAMAGE CAN OCCUR.

 CAUTION : YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.
_______
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
　
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