(c)  
Connect the oil pressure tubes to the differential pressure switch. 1) ENGINES WITHOUT PW SB 79-70;

 tighten the tube nuts to 135-145 pound-inches (15.253-16.383 newton-meters).
 2)  ENGINES WITH PW SB 79-70; tighten the tube nuts to 65-75 pound-inches (7.344-8.474 newton-meters).
 3)  Attach lockwire or safety cable and safety cable ferrule to the tube nuts.
 S 424-038-N00
 (2)  
ENGINES WITH PW SB 79-77;
 Do the steps that follow:

 (a)  
Install the differential pressure switch on the bracket with the bolts, washers and nuts. 1) Lubricate the threads of the bolts, which attach the

 differential pressure switch, with engine oil.
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2)  Tighten the bolts to 36 - 40 pound-inches (4.067 - 4.519 newton-meters).
 (b)  
Install the elbow, threads lubricated with Engine Oil, to the connector installed in the left pressure port of the main oil filter housing (as viewed from the front). 1) Tighten the elbow to 65 - 75 pound-inches (7.344 - 8.474

 newton-meters).

 (c)
Install oil filter pressure tube as follows (LP45).

 1)  Install the oil filter pressure tube (LP45), threads lubricated with engine oil, to the forward connector on the pressure switch and to the front connector installed in the main oil filter housing.
 2)  Attach the oil filter pressure tube (LP45) to the mount bracket with the clamp and bolt.
 NOTE: The clamp is attached to the middle hole of the
____ mount bracket to attach the oil filter pressure tube (LP45).
 3) Tighten the clamp bolt to 36 - 40 pound-inches
 (4.067 - 4.519 newton-meter).
 (d)  
Install the oil filter pressure tube (LP46), threads lubricated with Engine Oil, to the rear connector on the pressure switch and to the elbow installed in the main oil filter housing.

 (e)  
Tighten the tube nuts of both oil filter pressure tubes (LP45, LP46) to 65 - 75 pound-inches (7.344 - 8.474 newton-meters).

 S 024-033-N00
 (3)  
Remove the protection cap from the electrical connector.

 S 434-014-N00

 (4)  
Connect the electrical connector (DS1583) to the differential pressure switch.

 F.  
Put the Airplane Back to Its Usual Condition.

 S 414-026-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the left thrust reverser (AMM 78-31-00/201).

 (2)  
Close the left core cowl panel (AMM 71-11-06/201).

 (3)  
Close the left fan cowl panel (AMM 71-11-04/201).

 S 414-020-N00
 S 414-021-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(4)  S 444-022-N00Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
 (5)  S 864-023-N00Remove the DO-NOT-CLOSE tags and close these circuit breakers as follows: (a) P7 Overhead Circuit Breaker Panel 1) 7F9 EIU L 2) 7F10 EIU C 3) 7F15 EIU R
 (6)  S 794-016-N00Do the test of the oil filter differential pressure switch that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).

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 79-35-01
　
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