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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LOW OIL PRESSURE WARNING SWITCH - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task is the removal of the low oil pressure warning switch. The second task is the installation of the low pressure warning switch.
 B.  The low oil pressure warning switch is installed on the fan case at the 10 o'clock position forward of flange K.
 TASK 79-33-01-004-001-C00
 2.  Low Oil Pressure Switch Warning Removal
_______________________________________
 A.  References
 (1)  AMM 71-11-02/201, Fan Cowl Panels
 B.  Access
 (1)  
Location Zone
 502 LH Fan Cowl, Left Nacelle
 602 LH Fan Cowl, Right Nacelle

 (2)  
Access Panels
 5746L Left Fan Cowl Panel, Left Nacelle
 5846R Right Fan Cowl Panel, Right Nacelle

 

 C.  Procedure (Fig. 401)
 S 864-002-C00
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  P6-3 Load Control Center
 1) MASTER DIM

 S 014-005-C00
 (2)  
Open the left fan cowl panel (AMM 71-11-02/201).

 S 034-006-C00

 (3)  
Disconnect the electrical connector from the low oil pressure warning switch.

 S 034-007-C00

 (4)  
Disconnect the oil tubes from the pressure switch:

 (a)  Disconnect the elbow from the low oil pressure warning switch.
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 79-33-01
 ALL  ú ú C04 Page 401 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
BOLT AND 
ELECTRICAL  WASHER 
CONNECTOR  (3 LOCATIONS) 
ELBOW 

BRACKET UNION
LOW OIL PRESSURE WARNING SWITCH FWD  VENT PRESSURE TUBE FROM THE TGB 
A

Low Oil Pressure Warning Switch Installation
Figure 401

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 79-33-01
 ALL  ú ú C03 Page 402 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b)  
Discard the O-ring.

 (c)  
Disconnect the vent pressure tube from the low oil pressure warning switch.

 (d)  
Discard the O-ring.

 S 024-004-C00
 (5)  Remove the pressure switch:
 (a)  
Remove the screws and washers that attach the pressure switch to the mounting bracket.

 (b)  
Remove the pressure switch.

 (c)  
If you will replace the pressure switch, remove and retain the union at each end of the switch.

 S 034-003-C00
 (6)  Install protective caps on the ends of the disconnected oil tubes.
 TASK 79-33-01-404-008-C00
 3. Low Oil Pressure Switch Warning Installation
____________________________________________
 A. Consumable Materials
 (1)  DOO599, 0il, (CP2442) engine - CFMI SB 79-001
 B. References
 (1)  
AMM 12-13-11/301, Engine Oil

 (2)  
AMM 71-00-00/501, Power Plant

 (3)  
AMM 71-11-02/201, Fan Cowl Panels

 (4)  
AMM 79-33-00/501, Low Oil Pressure Warning System

 C. Access
 (1)  
Location Zone
 502 LH Fan Cowl, Left Nacelle
 602 LH Fan Cowl, Right Nacelle

 (2)  
Access Panels
 5746L Left Fan Cowl Panel, Left Nacelle
 5846R Right Fan Cowl Panel, Right Nacelle

 

 D. Procedure (Fig. 401)
　
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