Emergency Protection Function (EPF) Test

TASK 36-11-00-740-806-A
Emergency Protection Function (EPF) Test

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 31-32-00-860-011-A	Procedure to Get Access to the SYSTEM REPORT/TEST/PNEU Page

3. Job Set-up
Subtask 36-11-00-861-156-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-00-865-150-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
49VU	AIR BLEED/APU BLEED VLV CTL/BMC1 OVRD	11HV	D14
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
122VU	AIR BLEED/APU BLEED VLV CTL/BMC2 OVRD	12HV	Z19

Subtask 36-11-00-860-124-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) On the AIR COND panel:

Make sure that the ENG 1(2) bleed pushbutton switches are pushed (OFF legends off).
Make sure that the crossbleed selector switch is at AUTO.
Make sure that the APU BLEED pushbutton switch is released (ON legend off).

(2) Adjust the brightness of the MCDU screen.
(3) On one MCDU, get the SYSTEM REPORT/TEST/PNEU menu page (Ref. AMM TASK 31-32-00-860-011).

4. Procedure
Subtask 36-11-00-740-054-A ** ON A/C NOT FOR ALL

A. BITE Test of the EBAS Application

During this procedure, if an error message is shown, record this message. Then do the related trouble shooting procedure.

NOTE: During the test, obey the instruction shown on the terminal.

ACTION	RESULT
1.On the MCDU: Push the line key adjacent to the applicable BMC (1HA) indication.	The applicable BMC (1HA) comes into view.
2.On the MCDU: Push the line key adjacent to the TEST indication.	The BMC (1HA)/TEST comes into view.
3.On the MCDU: Push the line key adjacent to the EPF TEST indication.	The BMC (1HA)/EPF TEST/CHECK INITIAL CONDITIONS pages comes into view. Initial conditions: * BLEED PRESSURE NOT AVAILABLE. * BLEED SYSTEM NOT IN SINGLE BLEED CONFIG. * ENGINE OFF.
4.On the MCDU: Push the line key adjacent to the CONTINUE indication.	The BMC (1HA)/EPF TEST/CHECK INITIAL CONDITIONS page comes into view. Initial conditions: * ENGINES NOT IN START SEQUENCE. * APU NOT BLEEDING. * HPGC NOT BLEEDING. * BMC1(2) SWITCH ON
5.On the MCDU: Push the line key adjacent to the CONTINUE indication.	The BMC (1HA)/LRU'S PNEU FUNCTIONS NOT CHECKED DURING TEST page comes into view. EPF TEST IN PROGRESS 60S.
TEST RESULT page comes into view with EPF TEST results:	If the test is OK: * LRU'S PNEU FUNCTIONS NOT CHECKED DURING TEST/EPF TEST OK come into the view. If the test is not OK: * LRU'S PNEU FUNCTIONS NOT CHECKED DURING TEST/failure messages and CLASS come into the view.
6.On the MCDU: Push the line key adjacent to the RETURN indication until the MAINTENANCE MENU page comes into view.

5. Close-up
Subtask 36-11-00-860-128-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put the aircraft back to its initial configuration.
(2) On the MCDU:
(a) Fully decrease the brightness of the MCDU screen (display off).

Subtask 36-11-00-862-137-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:07:30 UTC