Airbus All Operators Transmission A35P023-24

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Docket FAA-2025-0742 (document 0005) · AD 2025-18-06

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Docket FAA-2025-0742 (document 0006) · AD 2025-18-06

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Manufacturer: Airbus
Type: All Operators Transmission
Number: A35P023-24
Latest revision known: A35P023-24, Revision 01, dated July 25, 2024
Copies: 2 files of 1 revision

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ADs that cite it · 1

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AD 2025-18-06Oxygen · Airbus A350-941 and A350-1041Effective Oct 23, 2025 · Revision 01

Also cited in 1 proposed AD.

Text · 5

Revision 01, the newest copy. From the PDF’s text layer: layout, tables and figures are lost. The PDF is the document. © Airbus S.A.S. Filed by the FAA in regulations.gov docket FAA-2025-0742; AD 2025-18-06 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

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Page 1Open in PDF

CUSTOMER SERVICES DIRECTORATE 2 ROND POINT EMILE DEWOITINE 31700 BLAGNAC FRANCE TELEPHONE + 33 (0)5 61 93 33 33

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A35P023-24 Rev 00 Page 1 of 5 Date: 18-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 35 – INSPECTION OF CABIN OXYGEN CONTAINERS INSTALLATION AIRCRAFT TYPE: A350 OUR REF.: A35P023-24 Rev 00 dated 18-JUL-2024 EFFECTIVITY DATE:

1. AIRCRAFT AFFECTED Aircraft series MSN A350-900 487 A350-900 494 A350-1000 503 A350-900 504 A350-900 505 A350-900 506 A350-1000 507 A350-1000 509 A350-900 512 A350-900 517 A350-900 528 A350-900 537 A350-900 540 A350-1000 547 A350-900 548 A350-900 549 A350-900 551 A350-900 552 A350-900 554 A350-900 556 A350-900 557 A350-900 558 A350-900 559 A350-1000 560 A350-900 561 A350-900 562 A350-1000 563 Aircraft series MSN A350-900 564 A350-900 565 A350-900 567 A350-900 568 A350-900 569 A350-900 570 A350-900 571 A350-900 572 A350-900 573 A350-900 574 A350-900 575 A350-900 576 A350-900 577 A350-900 578 A350-900 579 A350-900 580 A350-900 581 A350-900 582 A350-900 583 A350-1000 584 A350-900 585 A350-900 587 A350-900 588 A350-900 589 A350-900 590 A350-900 591 A350-900 592 Aircraft series MSN A350-900 593 A350-900 594 A350-900 595 A350-900 596 A350-900 597 A350-900 598 A350-900 599 A350-900 602 A350-900 603 A350-900 604 A350-1000 605 A350-900 607 A350-1000 609 A350-1000 610 A350-900 611 A350-900 612 A350-900 613 A350-900 614 A350-900 615 A350-900 616 A350-1000 617 A350-900 618 A350-900 619 A350-900 621 A350-900 622 A350-1000 623 A350-900 624 Aircraft series MSN A350-900 625 A350-900 626 A350-900 627 A350-1000 628 A350-900 629 A350-900 630 A350-900 632 A350-900 633 A350-900 634 A350-1000 635 A350-900 636 A350-900 638 A350-1000 639 A350-900 640 A350-900 643 A350-900 644 A350-900 645 A350-1000 647 A350-900 648 A350-900 650 A350-900 651 A350-1000 652 A350-900 653 A350-900 654 A350-900 656 A350-900 659

2. REFERENCED DOCUMENTATION

2.1 APPENDIX N/A

Page 2Open in PDF

2.2 REFERENCES REF. 0: SD A350-A-35-21-XX-01001-04CA-A - Passenger Oxygen Storage REF. 1: MP TASK A350-A-35-21-36-00001-720A-A - Installation of the Oxygen Container REF. 2: MP TASK A350-A-35-21-36-00001-520A-A - Removal of the Oxygen Container REF. 3: MP A350-A-35-21-XX-00ZZZ-320Z-A Operational Check of Manual Mask Release Including Check of Container Opening for Chemical Oxygen System

3. REASON

3.1 FACTS Airbus informs the operator that during aircraft production, some oxygen containers fasteners may not have been tightened properly or may have been damaged during tightening. The same situation may also occur on adjacent panels’ fasteners.

3.2 HISTORY/BACKGROUND During inspection of the installation of oxygen containers in production, it has been found that some fasteners of oxygen containers and the adjacent panels (Passenger Service Unit (PSU), spacers or filler panels) were damaged or not properly locked.

3.3 ROOT CAUSE The root cause of this container installation issue in production is still on going at the time of issuance of this AOT.

3.4 INVESTIGATION N/A

3.5 CONSEQUENCES Because of incorrect fasteners tightening, containers may move along their installation rails during A/C life.

This relative movement of the container with regards to surroundings panels may result in insufficient gap between the oxygen container and the adjacent panels, therefore potentially preventing the opening of the oxygen containers.

Therefore, in case of a cabin depressurization event, passengers would not be able to reach the oxygen masks while seated.

4. OBJECTIVES OF THIS AOT This AOT recommends that each Operator perform the inspection detailed in paragraph 5.4 on the aircraft listed in §1.

5. MAINTENANCE PROCEDURE NOTE: This AOT is classified mandatory or expected to be classified mandatory by an Airworthiness Directive (AD). If the instructions of this AOT are marked as Required for Compliance (RC), the operator must follow the instructions as indicated. These instructions are introduced by “in accordance with”.

Page 3Open in PDF

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A35P023-24 Rev 00 Page 3 of 5 Date: 18-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT NOTE: The instructions of this AOT include procedures given in other documents or in other sections of the AOT. If the instructions of this AOT are NOT marked as Required for Compliance (RC), the operator can use an alternative procedure accepted by his/her local authority. These instructions are introduced by “refer to”.

NOTE: When this AOT gives the access or close-up instructions with no return to service tests, the operator can adapt these instructions to add flexibility to the maintenance operations. The technical intent of this AOT must comply with the set parameters.

5.1 PLANNING – (RC) The inspection as per paragraph 5.4 must be performed within 6 months from the effectivity date of this AOT.

5.2 MANPOWER →Elapsed time per aircraft is estimated at: 4 Man-Hours to check and tighten the fasteners if needed.

→Elapsed time per oxygen container is estimated at: 0.5 Man-Hours to replace a fixation element if needed.

→Elapsed time of the operational check of the manual mask release is estimated at: 2 Man-Hours if needed.

5.3 ACCESS

(1) For the location of this component, refer to the paragraph Component Location from REF 0.

(2) Use a STEPLADDER 1.0 M (3.3 FT) or STEPLADDER 0.5 M (1.6 FT) to reach the container where needed.

5.4 INSPECTION – (RC) For each panel located in each Passenger Supply Channel (PSC) and Oxygen Containers Types XIV, XV, XVII (OHSC), XVI (raft ceiling and entrance area):

Check that each fastener of each panel/component is locked according to the following image The blue line is an arbitrary reference. The slot in the screw (green line) has to be aligned or almost aligned with this arbitrary reference.

Page 4Open in PDF

Locked

5.5 FINDINGS – (RC) Any fastener which found in a different position than the one shown in paragraph §5.4, or if found damaged, is to be considered as a finding.

Here is an example of a finding:

Not Locked

5.6 INSTRUCTIONS – (RC) →If one or more fasteners are found unlocked on an oxygen container or an oxygen container adjacent panel:

Check that a minimum clearance of 2.0 mm between the oxygen container door lid and the adjacent panel/component is correct. As per REF. 1.

Lock the fastener by using an Allen key 1/8in, turn the screw one quarter turn clockwise, per illustration from §5.4 →If one or more fasteners are found unlocked on other panels:

Lock the fastener by using an Allen key 1/8in, turn the screw one quarter turn clockwise, per illustration from §5.4.

Page 5Open in PDF

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A35P023-24 Rev 00 Page 5 of 5 Date: 18-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT →If a fixation element is found damaged and the fastener could not be locked correctly:

On an adjacent panel: Replace the damaged fixation element as per associated CMM/CMP.

On an oxygen container:

oRemove the container per REF. 2 oInstall a serviceable container per REF. 1.

→At the end of the inspection, if an oxygen container or an adjacent panel had to be readjusted:

Perform the operational test of the manual mask release for the chemical oxygen system as per REF. 3.

5.7 SPARES AND TOOLING The following tooling can be used to perform the task:

a. Allen key 1/8 in to be used for locking the fasteners if needed.

b. A non-metallic 2 mm filler gauge could be used to check the minimum clearance.

6. ADDITIONAL INFORMATION

6.1 FOLLOW-UP PLAN No additional action is requested further to this one-time inspection

6.2 IMPACTED DOCUMENTATION N/A

7. AOT APPROVAL The technical content of this document is approved under the authority of the DOA ref.EASA.21J.031.

8. REPORTING Address your inspection results (with or without findings) to Airbus Customer Services through the generic e-mail address. Refer to the latest reporting policy (Ref in the OIT 999.0018/16).

Give the AOT reference in the mail title, as follows: {A35P023-24 Rev 00} Inspection Result Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Engineering Dossier, ATA 35-21 and mention “A35P023-24 Rev 00 Inspection results” in the title.