(b)
 Open the four toggle joints to separate the upper and lower plenum halves.

 NOTE : Do not disconnect the toggle joints completely at this
____
 point.

 (c)
 Disconnect the two toggle joints from the hooks (2) on one side and lower the lower inle-plenum (1).

 (d)
 Disconnect the other two toogle joints from the hooks (2) and remove the lower inlet-plenum (1).

 Inlet Plenum-Lower Figure 401/TASK 49-16-48-991-002 
R  EFF :  106-149, 211-299, 301-399, 401-499,  49-16-48 Page 404 Aug 01/05
 CES 

 TASK 49-16-48-400-002
 Installation of the Lower Inlet-Plenum (APS 3200)
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific 1 ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE No specific Torque Wrench : range 36.00 to 220.00 lbf.in
 (0.40 to 2.60 m.daN)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
 the Ground Connector 49-00-00-710-008 Operational Test of the APU (APS 3200) 49-23-17-400-001 Installation of the Inlet Pressure/Temperature Sensor
 (8013KM) (APS 3200) 49-41-38-400-002 Installation of the Ignition Unit (8030KM) (APS 3200) 49-51-19-400-002 Installation of the Sensor - Compressor Discharge
 Pressure (8039KM) (APS 3200) 49-73-31-400-001 Engine Identification Module (8061KM) - Installation
 (APS 3200) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-16-48-991-002 Fig. 401

 3. Job Set-up
__________ Subtask 49-16-48-860-055
 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 3M (10 FT)- ADJUSTABLE 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 49-16-48-865-054
 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 49-16-48-991-002) Subtask 49-16-48-420-051-A
 A. Installation of the Lower Inlet-Plenum
 (1)
 Install the lower inlet plenum

 (a)
 Hang the lower half plenum (1) with the four toggle joints on the hooks (2). Do not close the toggle joints at this time.

 (b)
 Make sure the plenum alignment-tab is aligned with the pin.

 (c)
 Close two toggle joints on one side of the plenum.

 (d)
 Make sure that the alignment pin is still aligned with the plenum alignment tab.

 (e)
 Close two toggle joints on the other side

 (f)
 Verify correct engagement of the pin and plenum alignment tab.

 (2)
 Install the accessories on the plenum

 (a)
 Install the Compressor Discharge-Pressure Sensor (8039KM) (Ref. TASK 49-51-19-400-002).

 (b)
 Install the Inlet Pressure/Temperature Sensor (8013KM) (Ref. TASK 49-23-17-400-001).

 (c)
 Install the Ignition Unit support bracket to the lower inlet plenum.
　
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