12-13-03
ALL ú ú 01 Page 315 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
APU - SERVICING (FILL THE OIL)
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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
ALL ú ú 05.1 Page 301 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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
ALL ú ú 01 Page 302 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
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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