12-13-03
 ALL  ú ú 01 Page 315 ú May 28/99
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757
MAINTENANCE MANUAL

 APU - SERVICING (FILL THE OIL)
______________________________
 TASK 12-13-04-613-001
 1. APU - Servicing
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 A. General
 (1)  
An oil reservoir is in the bottom of the gearbox. The oil reservoir holds 6.2 quarts. A manual fill port with a scupper drain is on the left side of the gearbox. You can pressure fill the oil reservoir also.

 (2)  
You can use EICAS or the sight gage to do a check of the APU oil level. On some APUs, the sight gage can be used with the APU off or with the APU in operation. The sight gage is aft of the oil fill port on the left side of the APU.

 (3)  
GUN 001-050, 101-999; There is a low oil level switch on the APU that sends a signal to the EICAS computers when the oil level is 4.25 quarts or less (with the engine stopped). The APU OIL QTY message will show when the low oil level switch sends a signal for 60 seconds.

 (4)  
GUN 051; There is an oil quantity transmitter on the APU that shows the oil quantity on EICAS. The transmitter sends signals to EICAS, which shows FULL, 0.75, 0.50, 0.25, or ADD on the PERF/APU display. When the oil level is 4.25 qts or less for 60 seconds (with the engine stopped), the transmitter sends a signal to EICAS and the APU OIL QTY message shows.

 B. Consumable Materials ú (1) D00068 Oil, Aircraft Turbine Engine, Synthetic Base, Type II -ú MIL-PRF-23699 (NATO 0-156) ú (2) D00071 Oil, Aircraft Turbine Engine, Synthetic Base, Type I -ú MIL-PRF-7808
 C. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 31-41-00/201, EICAS

 (3)  
AMM 49-11-00/201, Auxiliary Power Unit

 D. Access
 (1)  
Location Zones
 154 Aft Cargo Compartment - Right
 211 Flight Compartment - Left
 212 Flight Compartment - Right
 315 APU Compartment - Left
 316 APU Compartment - Right

 (2)  
Access Panels
 315AL APU Access Door - Left
 316AR APU Access Door - Right
 822 Aft Cargo Door

 E. Do a Check of the APU Oil Level.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-13-04
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757
MAINTENANCE MANUAL

SUPPLY LINES OIL COOLER 
SEE  A  OIL DRAIN SCUPPER TEST PORT OIL PRESSURE BSEE 
FILL FITTINGS PRESSURE 
FWD  DRAIN PLUG OIL RESERVOIR  OIL LEVEL SIGHT GAGE SEE C 
PACKING  DRAIN PLUG MAGNETIC 
A 
OIL FILL CAP 
DRAIN OIL SCUPPER  FULL MARK APU OFF  FULL  FULL  FULL 
ADD  ADD  FULL  ADD 
B  FWD  FULL MARK APU OPERATING  ON APU  OFF APU 
1 2  APUs PRE-ALLIEDSIGNAL-SB 49-5887 APUs POST-ALLIEDSIGNAL-SB 49-5887  C  1  C  2 
Figure 301 APU Oil Servicing 

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 12-13-04
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MAINTENANCE MANUAL

 S 213-024
 (1)  Use one of these procedures to do a check of the oil level in the APU:
 (a)  
Use the EICAS display to do a check of the oil level. 1) Supply electrical power (AMM 24-22-00/201). 2) Look for the APU OIL QTY message on the EICAS STATUS

 display. 3) If the APU OIL QTY message is on EICAS, fill the APU oil.

 (b)  
ON AN OIL SIGHT GAGE WITHOUT A FULL MARK FOR THE APU ON; Use the sight gage when the APU is off to do a check of the oil level. 1) Open the left APU access door, 315AL, and right APU access

 door, 316AR:
 a) Open the latches on the APU access doors.
 b) Open the left access door.
　
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