EIU DISCRETE OUTPUTS Simulation [IAE]

TASK 73-25-34-860-041-A
EIU DISCRETE OUTPUTS Simulation

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. 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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-32-00-860-012-A	Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
DISCRETE OUTPUTS Menu

3. Job Set-up
Subtask 73-25-34-861-056-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 73-25-34-865-065-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
FOR FIN: 1000EM2 (ENGINE2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40

Subtask 73-25-34-860-061-A ** ON A/C NOT FOR ALL

C. On the left or right MCDU get the SYSTEM REPORT/TEST ENG page. (Ref. AMM TASK 31-32-00-860-012).

4. Procedure
Subtask 73-25-34-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration

DISCRETE OUTPUTS Menu ** ON A/C NOT FOR ALL

WARNING: DO NOT TOUCH THE PROBES IMMEDIATELY AFTER THE TEST. THEY ARE HOT AND CAN BURN YOU.

CAUTION: REMOVE THE PROTECTIVE COVERS FROM THE PROBES BEFORE YOU DO THE TEST.

(1) LOP GND1 line key

NOTE: Use this key to simulate OIL LOW PRESS & GND for these systems through the MCDU: Blue/Yellow-main-hydraulic-pressure power warning-indicating, WHC2, PHC2, Green-main-hydraulic PWR RVSR indicating, FCDC1, FCDC2.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to LOP GND1	LOP GND1 discrete output status becomes "0" B(Y) ELEC PUMP LO PR warning message inhibition stops The PHC2 controls a low probe heating level for pitot 2 The WHC2 controls a low windshield (F/O) heating level The 3DB1 and 3DB2 rain repellent valve can open NOTE: The LOP GND1 discrete is used to inhibit the Flight Control System test through the CFDS. Access to this menu is prohibited by the CFDS architecture as long as you work on the EIU DISCRETE OUTPUTS menu.
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration

WARNING: DO NOT TOUCH THE PROBES IMMEDIATELY AFTER THE TEST. THEY ARE HOT AND CAN BURN YOU.

CAUTION: REMOVE THE PROTECTIVE COVERS FROM THE PROBES BEFORE YOU DO THE TEST.

(1) LOP GND2 line key

NOTE: Use this key to simulate OIL LOW PRESS & GND for these systems through the MCDU: PHC1, PHC3, WHC1, AEVC, DFDR and CVR.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to LOP GND2	LOP GND2 discrete output status becomes "0" The PHC1 and PHC3 control a low probe heating level for pitots 1 and 3 The WHC1 controls a low captain windshield heating level The CVR and DFDR are set to on NOTE: When you simulate LOP GND2 to "0" the horn is inhibited if the airflow extraction is low in the avionics compartment.
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-054-A ** ON A/C NOT FOR ALL

C. T/R INHIB line key

NOTE: To simulate the authorization of closure of the thrust reverser directional control valve solenoid (through the relay 14KS1(2)) through the MCDU.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to T/R INHIB	T/R INHIB discrete output status becomes "1" and the 14KS1(2) inhibition relay is energized. This permits the energization of the directional-control-valve solenoid
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-055-A ** ON A/C NOT FOR ALL

D. FAULT line key

NOTE: Use this key to simulate a disagree between the position and the command of the HP fuel valve through the MCDU.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to FAULT	FAULT discrete output status becomes "1" and FAULT legend of the 5KS1(2) annunciator light comes on.
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.	The FAULT legend goes off.
5.Stop the MCDU

Subtask 73-25-34-860-056-A ** ON A/C NOT FOR ALL

E. HP FUEL PN line key

NOTE: Use this key to simulate a HP FUEL VALVE 1(2) in the open position through the MCDU.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to HP FUEL PN	HP FUEL PN discrete output status becomes "1" and the zone controller 8HK will receive the HP FUEL VALVE 1(2) open condition. NOTE: The zone controller uses the HP fuel valve position to make the bleed status on label 061. Then it sends it to the EEC through the EIU (label 030). This input can change the bleed status only if the PRV opens (engine in operation).
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-057-B ** ON A/C NOT FOR ALL

CAUTION: THE APU BOOST FUNCTION SHOULD NOT BE USED UNLESS STRICTLY REQUIRED FOR TROUBLE SHOOTING PURPOSE THUS TO AVOID PREMATURE CORE PERFORMANCE DETERIORATION. IF REALLY REQUIRED, DO NOT OPERATE THE APU FOR MORE THAN ONE (1) MINUTE IN BOOST MODE CONDITION. NOTE THAT FOR TROUBLE SHOOTING AN ECS SYSTEM MALFUNCTION, THE ENGINE BLEED SHOULD BE PREFERRED.

F. APU BST1 line key

NOTE: Use this key to simulate an APU BOOST control through the MCDU.

NOTE: APU BST2 line key has no boost effect on the APU.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to APU BST1	APU BST1 discrete output status becomes "1" and the EIU sends the APU BOOST command to the ECB 59KD. The APU is boosted (if in operation).
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-058-A ** ON A/C NOT FOR ALL

G. PACKS OFF line key

NOTE: Use this key to simulate the PACK FLOW control valve closure control through the MCDU.

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to PACKS OFF	PACKS OFF discrete output status becomes "1" and the PACK-FLOW-control-valve closure solenoid is energized. NOTE: A muscle air pressure is necessary to open the PACK FLOW control valve 1(2).
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.
5.Stop the MCDU

Subtask 73-25-34-860-059-A ** ON A/C NOT FOR ALL

H. Test Requirements:
(1) N2 > IDLE line key

NOTE: Use this key to simulate N2 > IDLE for these systems:
Radio altimeter transceiver 25A
Blue main hydraulic power

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(2) Do the EIS start procedure (ECAM display units only) (Ref. AMM TASK 31-60-00-860-001).

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS on the MCDU	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to N2 > IDLE	N2 > IDLE DISCRETE OUTPUT becomes "1" and the electric pump of the Blue hydraulic system start On the ECAM DU HYD page make sure that the Blue hydraulic system is pressurized (approximately 3000PSI) NOTE: The N2 > IDLE discrete is used to inhibit the RAMP TEST of the RADIO ALTIMETER 1(2). The CFDS architecture prevent access to the radio-altimeter RAMP-TEST menu as long as you work on the EIU DISCRETE OUTPUTS menu.

Subtask 73-25-34-860-060-A ** ON A/C NOT FOR ALL

I. Test Requirements:
(1) TLA > MCT line key

NOTE: Use this key to simulate TLA > MCT for these systems : AEVC, PACK CONTROLLERS, CABIN PRESSURE CONTROLLERS.

(2) Do the EIS start procedure (ECAM display units only) (Ref. AMM TASK 31-60-00-860-001).

ACTION	RESULT
1.Push the line key adjacent to the EIU1 (EIU2) on the MCDU	The EIU1 (EIU2) menu comes into view.
2.Push the line key adjacent to the DISCRETE OUTPUTS	The DISCRETE OUTPUTS menu comes into view.
3.Push the line key adjacent to TLA > MCT	TLA > MCT discrete output status becomes "1" On the ECAM DU PRESS page make sure that the inlet and extract skin air valves close
4.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.	The MCDU menu comes into view.
5.Stop the MCDU

5. Close-up
Subtask 73-25-34-862-056-A ** ON A/C NOT FOR ALL

A. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 73-25-34-860-062-A ** ON A/C NOT FOR ALL

B. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

[Rev.10 from 2021] 2026.04.01 03:01:36 UTC