DOC AIRBUS | TSM A320FLoss of the Turbine Make Up Air on the Engine 1
1. Possible Causes
· VALVE-STAGE 10 TO HPT AIR ( 4025KS )
· SOL VALVE-STAGE 10 AIR ( 4028KS )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
75-23-00-810-801-A Failure of the Turbine Cooling-Air Valve-Solenoid on Engine 1
75-23-00-810-813-A Failure of the Stage 10 to HPT Air Valve on Engine 1
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. AMM 75-23-51-000-010 Removal of the Stage 10 to HPT Air Control Valve
Ref. AMM 75-23-51-400-010 Installation of the Stage 10 to HPT Air Control Valve
Ref. AMM 75-23-52-000-010 Removal of the Stage 10 Air Solenoid Valve
Ref. AMM 75-23-52-400-010 Installation of the Stage 10 Air Solenoid Valve
3. Fault Confirmation
Subtask 75-23-00-860-062-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG FADEC GND PWR 1 pushbutton switch.
Subtask 75-23-00-710-104-A
B. Test
(1) On the panel 50VU, push the ENG FADEC GND PWR 1 pushbutton switch and release it again.
NOTE: This action resets the FADEC memory.
(2) On the MCDU, push the INIT mode key. The INIT page comes into view.
(3) Enter a new flight number.
(4) Start the engine 1 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 .
(5) Do a shutdown of the engine 1 by the discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(6) Read the LAST LEG REPORT of the FADEC (1A and 1B) menu on the MCDU (Ref. 70-00-00 Page
Block 301 Task Supporting Data) and make a record of the maintenance message.
4. Fault Isolation
Subtask 75-23-00-810-078-A
A. If the test does not give the maintenance message TCA VLV/SOL/EEC 1 : no further action is necessary,
or if the test gives another maintenance message do the trouble shooting procedure related to the
maintenance message.
Subtask 75-23-00-810-079-A
B. If the test gives the maintenance message TCA VLV/SOL/EEC 1
(1) Do a check to see if one or more of the maintenance messages that follow are shown :
· TCA VLV SOL/HC/EEC 1
· TCA VLV/HC/EEC 1
(a) You must correct these faults must corrected before you continue :
· do the related fault isolation procedures (Ref. TSM 75-23-00-810-801) and/or
(Ref. TSM 75-23-00-810-813) .
(2) If TCA VLV/SOL/EEC 1 is the only message shown :
· replace the VALVE-STAGE 10 TO HPT AIR ( 4025KS ) , Ref. AMM 75-23-51-000-010 and Ref.
AMM 75-23-51-400-010 .
(a) If the fault continues:
· replace the SOL VALVE-STAGE 10 AIR ( 4028KS ) , Ref. AMM 75-23-52-000-010 and Ref.
AMM 75-23-52-400-010 .
(b) If the fault continues:
· replace the EEC ( 4000KS ) , Ref. AMM 73-22-34-000-010 and Ref.
AMM 73-22-34-400-010 .
Subtask 75-23-00-710-105-A
C. Do the test given in Para. 3.
5. Close-up
Subtask 75-23-00-860-065-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG FADEC GND PWR 1 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 . [Rev.6 from Feb 2017] 2026.04.04 04:37:13 UTC