5. Operation/Control and Indication
________________________________ (Ref. Fig. 002) The HOT SNSR measures the temperature of the oil downstream of the oil cooler. The ECB 59KD receives the temperature signal and thus it monitors the APU oil temperature. It starts the APU automatic shutdown sequence if the oil temperature is more than the limit (Ref. 49-61-00). The LOP SW monitors the pressure downstream of the oil pressure filter. It transmits a low oil-pressure signal to the ECB 59KD when the oil pressure decreases below the limit (Ref. 49-61-00). Then the ECB starts the APU automatic shutdown sequence.
LOW OIL PRESSURE AND HIGH OIL TEMPERATURE WARNING ((GTCP 36-300))
_________________________________________________________________ MAINTENANCE PRACTICES
_____________________
R **ON A/C 001-003, 051-099, 401-499,
TASK 49-94-00-000-003
Removal of the Oil Pressure/Temperature Assembly (GTCP 36-300)
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______
WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING : DO NOT LET OIL STAY ON YOUR SKIN FOR A LONG TIME AS IT CAN CAUSE
_______
INJURY.
1. Reason for the Job
__________________
The Removal/Installation, Cleaning and Inspection/Check of these components: - oil pressure/temperature assembly,
-low oil-pressure switch (121KD).
-high oil-temperature switch (120KD).
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
No specific blanking plugs
No specific circuit breaker(s) safety clip(s)
No specific warning notice
No specific container 2 l (0.5283 USgal)
No specific access platform 3.5 m (11 ft. 6 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action 52-41-00-010-001 Open the APU Doors for Access 49-94-00-991-002 Fig. 201
3. Job Set-up
__________ Subtask 49-94-00-860-058
A. Aircraft Maintenance Configuration
(1)
Energize the ground service network
(Ref. TASK 24-42-00-861-001).
(2)
On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-94-00-865-054
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-94-00-010-051
C. Get Access
(1)
Put the access platform below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT SW 11LJ to the ON position.
4. Procedure
_________
(Ref. Fig. 201/TASK 49-94-00-991-002) Subtask 49-94-00-020-054
A. Removal of the Oil Pressure/Temperature Assembly
(1)
Remove and discard the lockwire from the electrical connectors (8) and (9).
(2)
Disconnect the electrical connectors (8) ansd (9).
(3)
Put blanking caps on the disconnected electrical connectors.
(4)
Put a container in position below the oil pressure/temperature assembly (7).
(5)
Remove and discard the lockwire from the oil pipes (4), (5), (6),
(16) and from the fitting (3) and the elbow (15).
(6)
Disconnect the oil pipes (4), (5) and (6) from the fitting (3) and disconnect the oil pipe (16) from the elbow (15).
(7)
Loosen the nut (2) which attach the fitting (3) to the pressure/temperature assembly (7).
(8)
Remove the fitting (3) from the temperature/pressure assembly (7). Discard the o-ring (2).
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