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ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 1 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 24 – Ni-Cd Batteries - Risk of capacity reduction during aircraft parking AIRCRAFT TYPE: A318,A319,A320,A321 OUR REF.: A24N006-20 Rev 01 dated 12-OCT-2020 OUR PREVIOUS REV: A24N006-20 Rev 00 dated 09-SEP-2020 EFFECTIVITY DATE: 9-SEP-2020
0. REASON FOR REVISION This AOT is revised mainly to :
update the information provided in the applicability paragraph of this AOT (§ 4.2.1).
Two groups of batteries (A and B) are now defined to further clarify which actions need to be accomplished for each group.
remove the requirement for battery capacity restoration before the application of the on-wing preservation procedure.
Note:
The content of this AOT has been reworded and re-organised since last revision.
Therefore, “REV” tags have not been added to identify the different modifications.
1. AIRCRAFT AFFECTED All Aircraft
2. REFERENCED DOCUMENTATION
2.1 APPENDIX Appendix 1: Short term action Appendix 2: On-wing battery preservation procedure
2.2 REFERENCES Ref 1: ISI 24.00.00046 (ATA 24 - Recommendations for parking & storage during COVID19 period) Ref 2: Task in AMM PB 10-10-00 (Parking and storage procedure) Ref 3: Task in AMM PB 10-11-00 (Parking periodic ground checks) Ref 4: Task in AMM PB 10-30-00 (Return to operation after a parking period) Ref 5: Task in AMM PB 24-38-51 (Removal of the battery) Ref 6: Task in AMM PB 31-21-00 (Procedure to set the Clock) Ref 7: Task in AMM PB 24-41-00 (Energize the aircraft electrical Circuits)
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 2 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Ref 8: Task in AMM PB 24-41-00 (De-Energize the aircraft electrical circuits) Ref 9: Task in AMM PB 24-42-00 (Energize the Ground Service Network from the External Power) Ref 10: Task in AMM PB 24-42-00 (De-Energize the Ground Service Network from the External Power) Ref 11: SAFT Battery CMM 24-38-51 (Battery PN 2758) Ref 12: SAFT Battery CMM 24-38-58 (Battery PN 416526)
3. REASON The purpose of this AOT is to inform the operators:
● that the capacity of the main batteries (FINs 2PB1 & 2PB2) may be reduced due to repetitive disconnections and connections during an aircraft parking period, as detailed in § 3.1 and § 4.2.1 of this AOT ● and of the need of restoring the capacity of these batteries per ref 11 (or ref 12), within a defined time frame.
3.1 FACTS In the frame of massive aircraft grounding due to COVID-19 pandemic, several engineering reviews have been organised between Airbus and the battery supplier SAFT. During these reviews, it was highlighted that the current AMM aircraft parking procedures (per ref 2 & ref 3) requiring physical disconnection and periodic reconnection of batteries may induce a reduction in capacity for Ni-Cd batteries, when repetitively done.
The current AMM aircraft parking procedures require:
● to disconnect the batteries when the aircraft is parked and de-energized for more than 2 days (per ref 2).
● to reconnect the batteries when aircraft is energized during aircraft periodic ground checks (per ref 3).
● to disconnect the batteries again at the end of the aircraft periodic ground checks (per ref 3).
When a Ni-Cd battery is physically disconnected from the aircraft loads, it self-discharges, due to an electrochemical phenomenon, thus, inducing a permanent reduction of battery capacity.
After each cycle of battery self-discharge, the available battery capacity will decrease progressively and will not be recovered to 100% of its initial capacity even when the battery is charged again from the aircraft electrical network during the periodic ground checks per ref 3.
In order to restore the battery capacity, the battery must be sent to an approved battery shop for a battery periodical check or a battery regular check or a battery general overhaul per ref 11 (or ref 12).
Note 1: This action in shop includes a battery charge at constant current which allows to restore the battery capacity.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 3 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Note 2: On aircraft, it is not possible to:
restore the battery capacity as the battery is charged at constant voltage.
check the battery capacity.
3.2 CONSEQUENCES As the battery capacity may be significantly reduced, the battery performance may be affected and hence, the battery functions may not be fully guaranteed.
4. SHORT TERM ACTION NOTE: This AOT is classified mandatory or expected to be classified mandatory by an Airworthiness Directive (AD). The accomplishment instructions marked as Required for Compliance (RC) must be done to comply with the AD. “RC” is indicating these paragraphs accordingly. If an AD is issued, reference should be made to the AD for the mandated accomplishment timescale.
NOTE: The accomplishment instructions of this AOT include procedures given in other documents or in other sections of the AOT. When the words ’refer to’ are used and the operator has a procedure accepted by the local authority he belongs to, the accepted alternative procedure can be used. When the words ’in accordance with’ are used then the given procedure must be followed.
NOTE: The access and close-up instructions, not comprising return to service tests, in this AOT do not constitute or affect the technical intent of the AOT. Operators can therefore, as deemed necessary, omit or add access and/or close-up steps to add flexibility to their maintenance operations as long as the technical intent of the AOT is met within the set parameters.
4.1 PLANNING AND MANPOWER
4.1.1 ACCOMPLISHMENT TIMESCALE (RC) The compliance time for this AOT is defined as follows:
Within 4 months after the AOT effectivity date or prior to next flight, whichever occurs latest.
For additional information, refer to appendix 1 of this AOT.
4.1.2 MANPOWER N/A
4.2 DESCRIPTION
4.2.1 APPLICABILITY Group A This AOT is applicable to Ni-Cd batteries (PN 2758 or PN 416526) which have been disconnected, kept (on aircraft) and reconnected on aircraft per ref 2 and ref 3 more than 4 times during an aircraft parking period since last battery periodical check or battery regular check or battery general overhaul per ref 11 (or ref 12) and which are still installed on aircraft, at the effectivity date of this AOT.
Refer to § 4.1.1, § 4.2.2 and § 4.2.3.1 of this AOT for the accomplishment of the required actions.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 4 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Group B This AOT is also applicable to all other Ni-Cd batteries (PN 2758 or PN 416526) not identified in group A.
Refer to § 4.2.3.2 of this AOT for the accomplishment of the required actions.
4.2.2 TERMINATING ACTION (RC) The restoration of the capacity of the batteries, identified in group A in § 4.2.1 of this AOT, is the terminating action for this AOT and is defined as follows:
- Do a battery periodical check or a battery regular check or a battery general overhaul per ref 11 (or ref 12) in an approved battery shop.
Note: This action in shop includes a battery charge at constant current allowing to restore the battery capacity.
4.2.3 APPLICATION OF NEW AMM PROCEDURES (RC) In order to preserve batteries, when the aircraft is parked and de-energized for more than 2 days, the AMM will be revised to introduce, as detailed in § 5.2 of this AOT, the off-wing battery preservation or the on-wing battery preservation.
4.2.3.1. Batteries identified in group A in § 4.2.1 of this AOT and installed on aircraft After the terminating action, as detailed in § 4.2.2 of this AOT, is completed, the off-wing battery preservation or the on-wing battery preservation, as detailed in § 5.2 of this AOT, must be applied when the aircraft is parked and de-energized for more than 2 days.
From the effectivity date of this AOT, operators can start applying the off-wing battery preservation or the on-wing battery preservation when the aircraft is parked and de-energized more than 2 days.
However, it is recommended that the battery capacity restoration, as detailed in § 4.2.2 of this AOT, is performed before the application of the on-wing battery preservation.
Note 1: A battery, affected by the issue detailed in § 3.1 of this AOT, cannot be restored through the application of the on-wing battery preservation.
Note 2: If the on-wing preservation procedure is applied for batteries with a reduced capacity, there is a risk that these batteries are over discharged before the aircraft is energized again per ref 3. This situation may prevent the battery from being recharged on aircraft.
4.2.3.2 Batteries identified in group B in § 4.2.1 of this AOT and installed on aircraft After effectivity date of this AOT, the off-wing battery preservation or the on-wing battery preservation, as detailed in § 5.2 of this AOT, must be applied when the aircraft is parked and de-energized more than 2 days.
4.2.4 ACCESS N/A
4.2.5 INSPECTION REQUIREMENTS N/A
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 5 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
4.2.6 FINDINGS N/A
4.3 SPARES AND TOOLING N/A
5. FURTHER INFORMATION
5.1 FOLLOW-UP PLAN Additional information related to this AOT (for instance, frequently asked questions, complementary recommendations if any) will be provided through ref 1.
5.2 IMPACTED DOCUMENTATION The AMM will be revised (currently planned for November 2020) to introduce, as detailed below, the off-wing battery preservation or the on-wing battery preservation.
The AMM advance copies are currently available since 29-SEP-2020.
A - Off Wing Battery Preservation If the aircraft is parked and de-energized more than 2 days, and the Off Wing battery Preservation method is used, then the batteries have to be disconnected and removed from aircraft per ref 5.
Note 1: To allow ground periodic checks per ref 3 during an aircraft parking period, batteries must be re-installed on aircraft and re-connected to the aircraft electrical network.
Note 2: Batteries removed from aircraft in parking or storage have to be stored per ref 11 (or per ref
12).
B - On-Wing Battery Preservation The on-wing battery preservation is a new procedure consisting in leaving the battery physically connected to the aircraft electrical network and keeping a minimum battery hot bus consumption, when the aircraft is parked and de-energized more than 2 days. This is achieved by pulling the circuit breakers of some loads supplied by the battery hot buses, as detailed in the appendix 2 of this AOT. In this configuration, there is no battery self-discharge, and hence the progressive and permanent reduction of the capacity of the batteries is avoided.
When the on-wing preservation procedure is applied, batteries must be sent to an approved battery shop for a battery regular check per ref 11 (or per ref 12), every six months during the aircraft parking period.
6. AOT APPROVAL The technical content of this document is approved under the authority of the DOA ref.EASA.21J.031.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A24N006-20 Rev 01 Page 6 of 6 Date: 12-OCT-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
7. REPORTING Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Maintenance Engineering Domain, Engineering Support Section and ATA 24-
38.
As per latest reporting policy (Ref to OIT 999.0018/16), inspection results (with or without findings) are to be addressed to Airbus Customer Services through the generic e-mail address:
inspection.results@airbus.com.
Best Regards, Christian FREMONT
VICE PRESIDENT ENGINEERING SUPPORT
CUSTOMER SERVICES Jean Pierre GOMEZ VICE PRESIDENT A320 PROGRAMME
CUSTOMER SERVICES
Appendix 1 : Short Term Action
Figure 1
Some
examples
AOT
Applicability
confirmed?
Terminating action needed?
When?
Application of new AMM procedures
needed, if aircraft is parked again or remain
in parking?
Example 1
Group A
Yes
T CT , at the latest
Recommended before AOT terminating action
Required after AOT terminating action
Example 2 Group A
Yes
T CT , at the latest
Recommended before AOT terminating action
Required after AOT terminating action
Example 3
Group A
Yes
Prior to next flight
Recommended before AOT terminating action
Required after AOT terminating action
Example 1
Group B
Not applicable
Required after AOT effectivity date
Example 2 Group B
Not applicable
Required after AOT effectivity date
Example 3 Group B
Not applicable
Required after AOT effectivity date
AOT ref:
A24N006-20 Rev 01
Page 1 of 1
Date:
12-OCT- 2020
Appendix 2 : On-wing battery preservation procedure
The procedures per ref 2, ref 3 and ref 4 are modified to include the instructions for
the on-wing battery preservation, as detailed below:
A/ The parking and storage procedure (ref 2) is modified as follows:
● Perform all steps from step 3.A.(1) to step 4.T.(1) of ref 2.
● Do not perform step
4.T.(2) of ref
2.
For ACJ configuration, do not perform steps
4.T.(2) and
4.T(3)
of ref 2.
● Perform all steps from step 5.A.(1) to step 5.A.(8) of ref 2.
● Perform the following steps after step 5.A.(8) of ref 2:
(1) In the cockpit, on overhead panel 35VU, release the pushbutton switches of BAT 1(2).
(2) In the cockpit, on the overhead panel 35VU, check the voltage of the BAT 1(2):
(a) If one of the battery voltages is less than 26V, perform a cycle of battery charge as
follows:
○ On the ECAM control panel:
- Push the ELEC key to get the ELEC system page.
○ On the control panel 35VU:
- Push the related BAT 1(2) pushbutton switch (OFF and FAULT legends off)
to start the charging cycle of the battery 1(2),
○ If the aircraft is energized from external power or IDGs, on the APU section of the
overhead control and indicating panel 25VU:
- Push the APU MASTER SW pushbutton switch (ON legend comes on).
- Wait two seconds.
- Release the APU MASTER SW pushbutton switch (ON legend goes off).
○ On the lower ECAM DU:
- The green line between the BAT 1(2) indication and the DC BAT busbar
indication comes into view. The arrow points to the BAT 1(2) indication.
- The related parameter indications (voltage and current) come into view
green.
○ Wait until the battery contactor opens.
- The green line between the BAT 1(2) indication and the DC BAT busbar
indication:
- Goes out of view if the battery is correctly charged
- Stays in view if a battery charging is necessary.
Note:
The time for the battery to charge can be 30 minutes.
○ On the lower ECAM DU, on the ELEC page, make sure that the battery voltage is
more than 26VDC and the battery discharge current is equal to or less than 1A.
AOT ref:
A24N006-20 Rev 01
Page 1 of 7
Date:
12-OCT-2020
(b) Otherwise, no further actions required.
● Perform step 5.A.(9) of ref 2
● Perform the following steps after step 5.A.(9) of ref 2.
(1) Energize the ground service network from the external power per ref 9
Note:
This step is necessary only to have light in the avionic bay and in the cockpit.
If a torch
is used to perform steps (2) to (4) below, step (1) above can be disregarded.
(2) In the cockpit, on overhead panel 35VU, put the
WARNING
NOTICE(S) in position “Do not to
operate the batteries”.
(3) Get access to the avionics compartment:
- Put the ACCESS
PLATFORM 2M (6 FT) -
ADJUSTABLE in position at the avionics
compartment door 822.
- Open access door 822.
- Open the access panel of BATTERY power center 105VU.
(4) Immediately open, safety and tag these circuit breakers after the aircraft is de-energized. :
Panel
Designation
FIN
Location
105VU
ELEC/HOT BUS/701PP SPLY
5PB1
D01
105VU
ELEC/HOT BUS/701PP SPLY
12PB1
E01
105VU
ELEC/HOT BUS/702PP SPLY
5PB2
D02
105VU
ELEC/HOT BUS/702PP SPLY
12PB2
E02
Note:
In this configuration, the parking brake hydraulic system cannot be pressurized and
depressurized.
Note:
In this configuration, the horn is not operative.
(5) De-energize the ground service network from the external power per ref 10
Note:
If a torch has been used to perform steps
(2) to
(4) above, step
(5) above can be
disregarded.
● Perform all steps from step 5.A.(10) to step 5.B.(5) of ref 2.
AOT ref:
A24N006-20 Rev 01
Page 2 of 7
Date:
12-OCT-2020
B/ The parking periodic ground checks procedure (ref 3) is modified as
follows:
● Perform all steps from step 3.A.(1) to step 3.B.(1).(a) of ref 3.
● Perform the following steps instead of step 3.B.(2).(a) of ref 3:
(1) Energize the ground service network from the external power per ref 9
Note:
This step is necessary only to have light in the avionic bay and in the cockpit.
If a torch
is used to perform steps (2) to (4) below, step (1) above can be disregarded.
(2) Get access to the avionics compartment.
- Put the ACCESS
PLATFORM 2M (6 FT) -
ADJUSTABLE in position at the avionics
compartment door 822.
- Open access door 822.
- Open the access panel of BATTERY power center 105VU.
(3) Remove safety clips and tags and close these circuit breakers:
Panel
Designation
FIN
Location
105VU
ELEC/HOT BUS/701PP SPLY
5PB1
D01
105VU
ELEC/HOT BUS/701PP SPLY
12PB1
E01
105VU
ELEC/HOT BUS/702PP SPLY
5PB2
D02
105VU
ELEC/HOT BUS/702PP SPLY
12PB2
E02
(4) In the cockpit, on overhead panel 35VU, remove the
WARNING
NOTICE(S) in position “Do
not to operate the batteries”.
(5) De-energize the ground service network from the external power per ref 10
Note:
If a torch has been used to perform steps (2) to (4) above, step (5) can be disregarded.
● Perform step 3.B.(2).(b) per ref 3.
● After step 3.B.(2).(b) per ref 3, adjust the clock per ref 6
● Perform all steps from step
3.B.(2).(c) to step
4.M.(2) (or for A320neo PW configuration, to step
4.M.(1)) per ref 3.
● Perform the following steps instead of step
4.M.(3) (or or A320neo PW configuration, instead of
step 4.M.(2)) per ref 3 :
(1) In the cockpit, on overhead panel 35VU, release the pushbutton switches of BAT 1(2).
(2) In the cockpit, on the overhead panel 35VU, check the voltage of the BAT 1(2):
AOT ref:
A24N006-20 Rev 01
Page 3 of 7
Date:
12-OCT-2020
(a) If one of the battery voltages is less than 26V, perform a cycle of battery charge as
follows:
○ On the ECAM control panel:
- Push the ELEC key to get the ELEC system page.
○ On the control panel 35VU:
- Push the related BAT 1(2) pushbutton switch (OFF and FAULT legends off)
to start the charging cycle of the battery 1(2),
○ If the aircraft is energized from external power or IDGs, on the APU section of the
overhead control and indicating panel 25VU:
- Push the APU MASTER SW pushbutton switch (ON legend comes on).
- Wait two seconds.
- Release the APU MASTER SW pushbutton switch (ON legend goes off).
○ On the lower ECAM DU:
- The green line between the BAT 1(2) indication and the DC BAT busbar
indication comes into view. The arrow points to the BAT 1(2) indication.
- The related parameter indications (voltage and current) come into view
green.
○ Wait until the battery contactor opens.
- The green line between the BAT 1(2) indication and the DC BAT busbar
indication:
- Goes out of view if the battery is correctly charged
- Stays in view if a battery charging is necessary.
Note:
The time for the battery to charge can be 30 minutes.
○ On the lower ECAM DU, on the ELEC page, make sure that the battery voltage is
more than 26VDC and the battery discharge current is equal to or less than 1A.
(b) Otherwise, no further actions required.
● Perform step 4.M.(4) (or for A320neo PW configuration, perform step 4.M.(3)) of ref 3.
● Perform the following steps after step
4.M.(4) (or for A320neo PW configuration, after step
4.M.(3))
of ref 3.
(1) Energize the ground service network from the external power per ref 9
Note:
This step is necessary only to have light in the avionic bay and in the cockpit.
If a torch
is used to perform steps (2) to (4) below, step (1) above can be disregarded.
(2) In the cockpit, on overhead panel 35VU, put the
WARNING
NOTICE(S) in position “Do not to
operate the batteries”.
(3) Get access to the avionics compartment.
- Put the ACCESS
PLATFORM 2M (6 FT) -
ADJUSTABLE in position at the avionics
compartment door 822.
AOT ref:
A24N006-20 Rev 01
Page 4 of 7
Date:
12-OCT-2020
- Open access door 822.
- Open the access panel of BATTERY power center 105VU.
(4) Immediately open, safety and tag these circuit breakers after the aircraft is de-energized. :
Panel
Designation
FIN
Location
105VU
ELEC/HOT BUS/701PP SPLY
5PB1
D01
105VU
ELEC/HOT BUS/701PP SPLY
12PB1
E01
105VU
ELEC/HOT BUS/702PP SPLY
5PB2
D02
105VU
ELEC/HOT BUS/702PP SPLY
12PB2
E02
Note:
In this configuration, the parking brake hydraulic system cannot be pressurized and
depressurized.
Note:
In this configuration, the horn is not operative.
(5) De-Energize the ground service network from the external power per ref 10.
Note:
If a torch has been used to perform steps
(2) to
(4) above, step
(5) above can be
disregarded.
● Perform all steps from step 5.A.(1) to step 5.A.(4) per ref 3.
AOT ref:
A24N006-20 Rev 01
Page 5 of 7
Date:
12-OCT-2020