-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
49-00-00-710-005 Self-Test of the ECB (APS 3200) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-51-19-991-002 Fig. 401
3. Job Set-up
__________
Subtask 49-51-19-860-051
A. Aircraft Maintenance Configuration
(1)
Make sure that the aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).
(2)
On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3)
Make sure that there is 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).
(5)
Make sure that the access platform is in position below the APU compartment.
(6)
Make sure that the APU access doors are open (Ref. TASK 52-41-00-010-001).
(7)
Make sure that the LIGHT control switch 11LJ is set to the on position.
Subtask 49-51-19-865-055
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
4. Procedure
_________
(Ref. Fig. 401/TASK 49-51-19-991-002) Subtask 49-51-19-420-052
A. Installation
CAUTION : YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU
_______ REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.
CAUTION : -YOU MUST NOT INCREASE THE TIGHTENING TORQUE MORE THAN THE
_______ MAXIMUM VALUE. -APPLY ALL TIGHTENING TORQUES WITH A TORQUE WRENCH OR A CALIBRATED SCREWDRIVER.
(1)
Remove the blanking caps from the electrical connectors.
(2)
Remove the blank caps from the new sensor.
(3)
Lubricate the threads of the bolts (2) with OILS (Material No. 03-002).
(4)
Install the sensor (1) on the intake mount boss with the bolts (2), secure the bonding strap (Ref. TASK 20-28-00-912-004).
(5)
TORQUE the bolts (2) to 40 lbf.in (0.45 m.daN).
(6)
Connect the tube (4) to the sensor (1).
(7)
TORQUE the tube nut (4) to between 90 and 100 lbf.in (1.01 and 1.13 m.daN).
(8)
Connect the tube (5) to the sensor (1). NOTE : It may be necessary to adjust the angle of the elbow to align
____
with the tube (5), if it is, do step (9).
(9)
TORQUE the elbow and nut (if necessary) to between 90 and 100 lbf.in
(1.01 and 1.13 m.daN).
(10)
TORQUE the tube nut (5) to between 90 and 100 lbf.in (1.01 and 1.13 m.daN).
(11)
Make sure that the electrical connectors are clean and in the correct condition.
(12)
Connect the electrical connector (3) to the sensor (1). Subtask 49-51-19-865-056
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD
Subtask 49-51-19-710-050
C. Do the self-test of the ECB (Ref. TASK 49-00-00-710-005).
(1) Operate the APU for min. five minutes and examine the joints of the compressor discharge-pressure sensor for leaks.
NOTE : Leaks are not permitted.
____
________
5. Close-up
Subtask 49-51-19-410-051
A. Close Access
(1)
Set the LIGHT control switch 11LJ to the off position.
(2)
Make sure that the work area is clean and clear of tool(s) and other items.
(3)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s).
(5)
Remove the warning notice(s). Subtask 49-51-19-860-052
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