(g)  
Connect the vent line to the oil tank fitting and the exhaust port.

 S 416-006
 CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
 BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. SHROUD DRAIN LINES CAN OCCUR. DAMAGE TO THE
 (5)  Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
 (6)  S 416-007Close the APU cowl door: (a) Disconnect the door support rods. (b) Put the door support rods in the clips on the APU cowl door. (c) Close the APU cowl door.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
(d)  Close the latches for the APU cowl door.
 S 866-008
 (7)  Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU OIL INDICATING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________
 1.  General
_______
 A.  The APU oil indicating system (referred to as the oil indicating system) monitors the APU condition. The oil indicating system monitors for high oil temperature, low oil pressure, and low oil quantity. The oil indicating system has three indicator lights on the P5 forward overhead panel. Also, the oil indicating system has these switches on the APU engine:
 (1)  
the high oil temperature switch (referred to as the oil temperature switch)

 (2)  
the low oil pressure switch (referred to as the oil pressure switch)

 (3)  
the low oil quantity switch (referred to as the oil quantity switch).

 B. These are the three indicator lights for the oil indicating system:
 (1)  
the HIGH OIL TEMP or FAULT light (amber)

 (2)  
the LOW OIL PRESSURE light (amber)

 (3)  
the LOW OIL QUANTITY or MAINT light (blue).

 C.  The LOW OIL PRESSURE light and the HIGH OIL TEMP or FAULT light are connected to the APU annunciator light and the MASTER CAUTION lights. The APU annunciator light and the MASTER CAUTION lights are found on the pilot's lightshield. When the LOW OIL PRESSURE light, the HIGH OIL TEMP or FAULT light or these two lights are energized, the APU annunciator light and the MASTER CAUTION lights are energized (AMM 33-15-00/001). The LOW OIL QUANTITY or MAINT light is not connected to the circuit for the APU annunciator light and the MASTER CAUTION lights.
 D.  To do a check of the indicator lights, each one can be pushed. Also, all the indicator lights can be tested when the master test switch is pushed.
 2.  HIGH OIL TEMP or FAULT Light
____________________________
 A.  The HIGH OIL TEMP or FAULT light is energized when the APU oil temperature is more than approximately 285°F (140°C). At this temperature, the oil temperature switch closes and completes the circuit for the HIGH OIL TEMP or FAULT light. For a more detailed description of the oil temperature switch, refer to AMM 49-61-00/001.
 3.  LOW OIL PRESSURE Light
______________________
 A.  The LOW OIL PRESSURE light is energized when the oil pressure is too low to operate the APU. The LOW OIL PRESSURE light is on during the APU start until oil pressure is more than 55 psig (379 kPa). During the APU operation, the LOW OIL PRESSURE light will come on if the oil pressure is less than 45 psig (310 kPa). The oil pressure switch sends the signal to the LOW OIL PRESSURE light. For a more detailed description of the oil pressure switch, refer to AMM 49-61-00/001.
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