3. Job Set-up
__________
Subtask 79-34-15-860-050
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a warning notice 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 is in position to tell persons not to energize the FADEC 1(2).
Subtask 79-34-15-010-051
B. Make sure that the fan cowl doors are open (Ref. TASK 71-13-00-010-040): FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
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4. Procedure
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(Ref. Fig. 401/TASK 79-34-15-991-300)
Subtask 79-34-15-640-050
A. Lubricate the packing (45) with engine oil (Material No. CP2442).
Subtask 79-34-15-420-050
B. Installation of the Low Oil Pressure Switch
(1) Remove the protective covers from the electrical connector, the low oil pressure switch (25) and the tubes.
(2) Clean the mating surfaces. WARNING : TRICHLOROETHANE IS A HAZARDOUS MATERIAL THAT CAN CAUSE
_______ INJURY OR ILLNESS IF NOT CORRECTLY USED. BEFORE YOU USE THIS PRODUCT, READ THE APPLICABLE MANUFACTURER'S "MATERIAL DATA SAFETY SHEET" AND OBEY THE SAFETY AND HEALTH PRECAUTIONS.
(a) To be sure of a good electrical bond between the low oil pressure switch (25) and the bracket, clean the mating surfaces with trichloroethylene (Material No. CP1008) and a lint-free cloth.
(3) Lubricate the packing. WARNING : ENGINE OIL IS A HAZARDOUS MATERIAL THAT CAN CAUSE INJURY OR
_______ ILLNESS IF NOT CORRECTLY USED. BEFORE YOU USE THIS PRODUCT, READ THE APPLICABLE MANUFACTURER'S "MATERIAL DATA SAFETY SHEET" AND OBEY THE SAFETY AND HEALTH PRECAUTIONS.
R (a) Lubricate the packing (45) with engine oil (Material No. CP2442).
(4) Install the packings (45) and the unions (40) in the pressure switch (25).
(5) TORQUE the unions to 100 lbf.in (1.13 m.daN).
(6) Attach the pressure switch (25) and thermo barrier (20) to the bracket with the bolts (35) and the washers (30).
(7) TORQUE the bolts to between 32 and 36 lbf.in (0.36 and 0.40 m.daN).
(8) Connect the tubes to the unions (40).
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(9) TORQUE the coupling nuts to 100 lbf.in (1.13 m.daN). NOTE : Use a second wrench to hold the unions when torque the tube
____
coupling nuts.
(10) Connect the electrical connector 4000ENA to the pressure switch (25). Tighten the connector by hand plus one-eighth turn.
(11) Do an electrical bond resistance check as follows: NOTE : Make sure you do an electrical bond resistance check at each
____
bolt location.
(a) Put one lead of the ohmmeter on the flange of the pressure switch
(25) near the bolt (35).
(b) Put the other lead of the ohmmeter on the surface of the bracket.
(c) The resistance measured between the ohmmeter leads must not be more than 0.0025 ohm. Do a check of the other two bolts.
(d) If the resistance is more than 0.0025 ohm, remove the pressure switch (25) and clean the mating surfaces again. Do this procedure until the resistance is less than 0.0025 ohm.
(12) Seal the electrical bond surfaces as follows: WARNING : DC 1200 PRIMER IS CLASSIFIED AS A DANGEROUS MATERIAL WHICH
_______ CAN CAUSE INJURY OR ILLNESS IF IT IS NOT CORRECTLY USED. REFER TO THE MANUFACTURER'S SPECIFIC SAFETY AND HEALTH RECOMMENDATIONS BEFORE YOU USE THIS PRODUCT. CAREFULLY READ THE APPLICABLE "MATERIAL SAFETY DATA SHEET" AND OBEY ALL SAFETY AND HEALTH PRECAUTIONS.
(a) Mix the primer (DC 1200) (Material No. CP2244) or primer SS-4004 per the manufacturer's instructions.
(b) Apply the primer around each bolthead, the pressure switch flange, and around the mating surface of the bracket. 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 OIL 滑油(73)
