Removal of the Lower Inlet-Plenum (APS 3200)

TASK 49-16-48-000-003-A
Removal 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	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-23-17-000-001-A	Removal of the Inlet Pressure/Temperature Sensor (APS 3200)
TASK 49-41-38-000-002-A	Removal of the Ignition Unit (APS 3200)
TASK 49-51-19-000-002-A	Removal of the Sensor - Compressor Discharge Pressure (APS 3200)
TASK 49-73-31-000-001-A	Removal of the Engine Identification Module (APS 3200)
TASK 52-41-00-010-001-A	Open the APU Doors for Access
Inlet Plenum-Lower

3. Job Set-up
Subtask 49-16-48-860-054-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-16-48-865-053-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-16-48-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).

4. Procedure
Subtask 49-16-48-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Lower Inlet-Plenum
(1) Remove the accessories on the plenum
(a) Disconnect the thermocouple electrical connectors P30 and P31 from the bracket.
(b) Remove the Ignition Unit (8030KM) (Ref. AMM TASK 49-41-38-000-002).
(c) Remove the Engine Identification Module (8061KM) (Ref. AMM TASK 49-73-31-000-001).
(d) Remove the Ignition Unit support bracket from the lower inlet-plenum.
(e) Remove the Inlet Pressure/Temperature Sensor (8013KM) (Ref. AMM TASK 49-23-17-000-001).
(f) Remove the Compressor Discharge-Pressure Sensor (8039KM) (Ref. AMM TASK 49-51-19-000-002).
(2) Remove the Lower Inlet-Plenum
(a) Make sure all connections between the engine and the plenum are removed, and that no part or connector will touch with the lower plenum removal.
(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).

[Rev.10 from 2021] 2026.04.01 01:28:11 UTC