Removal of the Engine Vibration Monitoring Unit (EVMU) [CFMB]

TASK 77-32-34-000-042-A
Removal of the Engine Vibration Monitoring Unit (EVMU)

FIN: 2EV ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

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 31-32-00-860-012-A	Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
Engine Vibration Monitoring Unit

3. Job Set-up
Subtask 77-32-34-861-086-A ** ON A/C NOT FOR ALL

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

Subtask 77-32-34-865-103-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
121VU	ENGINE/ENG1 AND 2/EVMU	1EV	R44

Subtask 77-32-34-941-060-A ** ON A/C NOT FOR ALL

C. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 77-32-34-869-139-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) If you are in PRE AIRBUS SB77-1006 (P/N 241-191-000-031 and 241-191-000-041):
(a) If needed, write the initial vibration values (Ref. AMM D/O 77-32-34-86).
(b) Go directly to Para. 3. E.
(2) If you are in POST AIRBUS SB77-1006 (P/N 241-246-022-004), do the fan trim balance to acquire initial values.
(a) On the MCDU 1(2), get the SYSTEM REPORT/TEST ENG page (Ref. AMM TASK 31-32-00-860-012).
(b) Push the key adjacent to the EVMU indication: the first EVMU page comes into view.
(c) Push the NEXT PAGE key.
(d) Push the key adjacent to the ENGINE UNBALANCE indication.
(e) The EVMU ENGINE UNBALANCE menu comes into view.
(f) Do the fan trim balance to acquire initial values.

ACTION	RESULT
1.Push the line key adjacent to the ENG1(2) TRIM indication.	The EVMU ENG1(2) TRIM BALANCE menu comes into view.
2.Push the line key adjacent to the ONE SHOT CFM56-5B indication.	The EVMU ENG1(2) CURRENT VIB INPUT menu comes into view.
3.Push the line key related to the data that you use to do the trim balance: FLIGHT DATA	The vibration data comes into view.
4.Push the line key adjacent to the CONT indication.	The INFLUENCE COEFF SELECT menu comes into view.
5.Push the line key adjacent to the GENERIC COEFF CFM56-5B indication.	The ENG1(2) INSTALLED CURRENT SCREWS menu comes into view.
6.Collect the hole/screw configuration on the result sheet or by a print of the MCDU screens.

Subtask 77-32-34-865-067-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1 AND 2/EVMU	1EV	R44

Subtask 77-32-34-010-052-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open the access door 824.

4. Procedure
Subtask 77-32-34-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Engine Vibration Monitoring Unit
(1) Loosen the knurled nuts (4).
(2) Lower the knurled nuts (4) to free the hooks (5).
(3) Pull the engine vibration monitoring unit (1) with the handle (3) until the connector (6) is disconnected.
(4) Remove the engine vibration monitoring unit (1) from its support (2).
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

[Rev.10 from 2021] 2026.04.02 06:37:44 UTC