# AVOX Systems Alert Service Bulletin 10015804-35-03 ## Copies (3) Copies the FAA filed in AD dockets on regulations.gov, newest revision first. A newer revision may exist. - Revision 05 ("SB 10015804-35-03 R5"), 13 pages: PDF https://openairdocs.org/files/sha256/d0/c9/d0c9f1ae221db194cd7c5090adc1532969d7b0c5fe4d533c46be706d9ae04ae4; text https://openairdocs.org/service-documents/avox/sb-10015804-35-03/file/d0c9f1ae221d.md. Rights: © AVOX Systems. Filed by the FAA in regulations.gov docket FAA-2024-0759; AD 2024-19-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Revision 03 ("SB 10015804-35-03 R3"), 26 pages: PDF https://openairdocs.org/files/sha256/73/33/7333bfee77771805200518369b898bd21d96d06f2ed71472ce76c9425c37fc3b; text https://openairdocs.org/service-documents/avox/sb-10015804-35-03/file/7333bfee7777.md. Rights: © AVOX Systems. Filed by the FAA in regulations.gov docket FAA-2023-0015; AD 2023-13-11 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Revision 02 ("10015804-35-03 R2_Final"), 13 pages: PDF https://openairdocs.org/files/sha256/cd/e5/cde513be76dc07b4f24557be674b8553096883c682d8ed6e38c4fb76392c6432; text https://openairdocs.org/service-documents/avox/sb-10015804-35-03/file/cde513be76dc.md. Rights: © AVOX Systems. Filed by the FAA in regulations.gov docket FAA-2020-0345; AD 2022-04-09 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [AVOX Systems](https://openairdocs.org/service-documents/avox.md) - Type: Service bulletin (Alert Service Bulletin) - Number: 10015804-35-03 - Latest revision known: 10015804-35-03, Revision 05, dated September 29, 2023 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/avox/sb-10015804-35-03 ## ADs that cite it (3) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2024-19-15](https://openairdocs.org/ad/2024-19-15.md), effective Nov 26, 2024: Revisions 01, 02, 03 and 04 - [AD 2023-13-11](https://openairdocs.org/ad/2023-13-11.md), effective Sep 5, 2023: Revisions 01, 02 and 03 - [AD 2022-04-09](https://openairdocs.org/ad/2022-04-09.md), effective Apr 4, 2022: Revisions 01 and 02 Also cited in [3 proposed ADs](https://openairdocs.org/service-documents/avox/sb-10015804-35-03/proposed.md). ## Text (13 pages) Revision 05, the newest copy. Rights: © AVOX Systems. Filed by the FAA in regulations.gov docket FAA-2024-0759; AD 2024-19-15 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than t hat which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Highlights 1 of 2 C2 - Confidential CUSTOMER SUPPORT AND SERVICES TECHNICAL PUBLICATION DEPARTMENT 61, RUE PIERRE CURIE CS20001 78373 PLAISIR CEDEX FRANCE Phone international : + 33 1 61 34 23 23 Fax international : + 33 1 61 34 21 13 Aerosystems Capability List and the Technical Publication Index https://www.safran-aerosystems.com/customers REVISION TRANSMITTAL SHEET SERVICE BULLETIN 10015804-35-03 REVISION NO. 05 DATED SEPTEMBER 29/2023 HIGHLIGHTS This sheet transmits Revision 05 to Service Bulletin 10015804-35-03. SUBJECT: OXYGEN – CYLINDER – POSSIBLE MISSING COMPONENT ON OXYGEN CYLINDER AND VALVE ASSEMBLY NOTICE: The Federal Aviation Administration (FAA) has issued Airworthiness Directive AD 2023- 13-11. This airworthiness directive references Revision 3 of this SB, and for this reason, Revision 4 and Revision 3 are now included for reference along with Revision 5 of this SB. NOTE: Revision 05 corrects the reference of the report form from Appendix 3 to Appendix 4 and incorporates new ADs. VSB SUMMARY Revision Changes are indicated by revision bars on the left side of the page. This revision includes changes / additions to the following paragraphs: Highlights 1 Updated revision information. Highlights 2 Updated. Page 2: Paragraph 1.E., Updated compliance statement as per new ADs. Page 2: Paragraph 1.K., Added new ADs. Page 8: Paragraph 3.D.(1).(a), Corrected the reference of the report form from Appendix 3 to Appendix 4. ### Page 2 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than t hat which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Highlights 2 of 2 C2 - Confidential REVISION HISTORY Original Release: Apr 11/2019 Rev 01 May 21/2019 Rev 02 Oct 15/2019 Rev 03 Jun 18/2021 Rev 04 June 12/2023 Rev 05 Sep 29/2023 ### Page 3 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 1 of 11 C2 - Confidential AVOX SYSTEMS INC 225 Erie Street Lancaster NY 14086 -9502 USA Tel: 716 -683 -5100 Fax: 716 -681 -1089 (53655) SERVICE BULLETIN U.S. EXPORT REGULATIONS The technical data in this document (or file) is controlled for export under the Export Administration Regulations (EAR), 15 CFR Parts 730-774, ECCN: 9E991. Violations of these laws may be subject to fines and penalties under the Export Administration Act. SUBJECT: OXYGEN – CYLINDER – POSSIBLE MISSING COMPONENT ON OXYGEN CYLINDER AND VALVE ASSEMBLY 1. Planning Information A. Effectivity (1) This SB applies to the following cylinder and valve assemblies installed on ATR aircraft and held in stores as well as spares. The attached “Affected Shipments” appendices provide lists of potentially affected part numbers, serial numbers, and delivery information. (2) The table below provides part numbers, CMMs and MFG Dates. PN Description CMM MFG Date 89794077 Cylinder and Valve Assembly 35-21-93 May 2017 - Nov 2018 891311-14 Cylinder and Valve Assembly 35-28-91 April 2017 - Nov 2018 B. Concurrent Requirements None C. Reason Multiple instances have been reported and confirmed of a cylinder & valve with oxygen leakage from the valve assembly vent hole. During the tear down analysis of the valve assemblies it was revealed that guide part number 10015804 was not assembled onto the stem part number 10017384. The absence of the guide creates a situation that increases the probability of significant oxygen leakage through the vent hole. This leakage will result in depletion of the oxygen cylinder and may create an oxygen enriched environment . NOTE: The valve body vent hole is not in the normal oxygen flow path. ### Page 4 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 2 of 11 C2 - Confidential D. Description This service bulletin provides instructions to inspect the cylinder & valve. If the cylinder & valve assembly fails the inspection criteria it should be returned to AVOX Systems for disposition. If the cylinder & valve assembly passes the inspection it should be identified by a blue paint dot on the valve assembly to show the SB has been accomplished. (Refer to Figure 7) E. Compliance Mandatory - Service Bulletin must be accomplished The Airworthiness Directive (AD) FAA AD 2023-13-11 issued on 2023-07-07 mandates compliance with this Service Bulletin. EASA AD No. 2021-0218-CN issued on 05 Sep 2023 cancelled the existing EASA AD 2021-0218 issued on 27 Sep 2021. F. Approval The technical content of this document is approved under the authority of the DOA ref.EASA.21J.044. G. Manpower Approximately 0.05 man-hour for inspection of each cylinder & valve assembly or body & gage assembly is required. H. Weight and Balance Not Changed I. Electrical Load Data Not Changed J. Software Accomplishments Summary None K. References EASA AD No.: 2021-0218 issued 27 Sep 2021 ATR Airworthiness Operator Message (AOM) 2019/04: Avox Systems Inc. Component Maintenance Manuals CMM 35-21-93 and CMM 35-28-91. Service Information Letter, SIL-35-162 FAA AD 2023-13-11 issued on 2023-07-07 EASA AD No. 2021-0218-CN issued on 05 Sep 2023 L. Publications Affected Avox Systems Inc. Component Maintenance Manual 35-21-93 and CMM 35-28-91 will be revised to incorporate the intent of this service bulletin. M. Interchangeability Not Applicable (NA) ### Page 5 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 3 of 11 C2 - Confidential 2. Material Information A. Material - Price and Availability None B. Industry Support Information Contact sao.avx.customerservice@safrangroup.com to return units that fail inspection and to report the results of units that pass inspection. Contact tech-support.sao@safrangroup.com for technical inquiries. Refer to Service Information Letter, SIL-35-162, for industry support information. C. List of Components Oil-based, blue paint permanent marker of local supply. D. Subcomponents to be Reidentified Inspected and acceptable cylinder & valve assembly will be identified with a blue paint dot on the valve assembly. E. Tooling Standard shop tools may be required. F. Special Tools Pin gauge 0.079” or 2mm Ø required to accomplish this inspection. Pin vise to accommodate 0.079" or 2mm inspection pin. (Optional) 3. Accomplishment Instructions NOTE: See Appendix 1 thru 3“Affected Shipments" for lists of affected Serial Numbers. Inspect only serial numbers found in the Appendix 1 thru 3 “Affected Shipments” lists. NOTE: Appendix 1 has not been changed since the initial release of this SB. NOTE: Appendix 2 was added with revision 3 to this SB to include serial numbers manufactured from October 1, 2017 through December 2017, and additional serial numbers manufacture d from January 2018 through November 2018. NOTE: Appendix 3 was added at revision 4 to this SB; if you have applied appendix 1 and 2 previously then only inspect serial numbers in Appendix 3. A. General Inspection of the cylinder & valve assembly may be performed while the unit is in-service or removed from the aircraft. B. Preparation A Pin gauge 0.079” or 2mm Ø is required to accomplish this inspection. ### Page 6 (OCR) C2 - Confidential S SAFRAN AEROSYSTEMS C. Procedure. (1) Verify the Serial Number is listed in the Affected Shipments list. NOTE: See Appendix 1 thru 3 "Affected Shipments" for lists of serial numbers. Attachments Appendix 1 thru 3 Affected Shipments Appendix 1 Affected Shipments. Name SAFRAN AEROSYSTEMS • Appendix 2 Affected Shipments.. L Appendix 3 Affected Shipments.. AVOX SYSTEMS INC 225 Erie Street Lancaster NY 14086-9502 USA Tel: 716-683-5100 Fax: 716-681-1089 (53655) SERVICE BULLETIN U.S. EXPORT REGULATIONS The technical data in this document (or file) is controlled for export under the Export Administration Regulations (EAR), 15 CFR Parts 730-774, ECCN: 9E991. Violations of these laws may be subject to fines and penalties under the Export Administration Act. SUBJECT: OXYGEN - CYLINDER - POSSIBLE MISSING COMPONENT ON OXYGEN CYLINDER AND VALVE ASSEMBLY (a) Check if unit is marked with a blue paint dot. If the unit is marked with a blue paint dot, the unit has already been inspected per this SB. (Refer to Figure 7 for blue paint dot location.) (b) If the unit is not marked with a blue paint dot, or, if a doubt exists that the inspection was performed on the unit, proceed with step (2). Gain access to the cylinder & valve assembly. Figures 1 through 6 show the inspection location on the cylinder & valve assembly OXYGEN FIGURE 1 OVERVIEW OF CYLINDER AND VALVE ASSEMBLY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 4 of 11 ### Page 7 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 5 of 11 C2 - Confidential FIGURE 2 CLOSE-UP OF VALVE ASSEMBLY FIGURE 3 CLOSE-UP ILLUSTRATION OF VALVE ASSEMBLY, PIN GAUGE MUST BE INSERTED BETWEEN THE BOTTOM OF THE PACKING RETAINER AND FLAT SURFACE OF THE VALVE BODY ABOVE THE PRESSURE GAUGE A 0.079 INCH (2.00 MM) MIN PACKING RETAINER VALVE BODY ### Page 8 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 6 of 11 C2 - Confidential FIGURE 4 CLOSE-UP OF INSPECTION PROCEDURE LOCATION ON VALVE ASSEMBLY (3) Perform the following inspection procedure on the cylinder and valve assembly. (a) Use a pin gauge, 0.079” or 2mm Ø, to determine if the cylinder and valve assembly meets the criteria for an acceptable unit. NOTE: The inspection criteria is applicable for all valve assembly configurations NOTE: It may be necessary to move safety cable to facilitate inspection (b) Slide the pin gauge between the bottom of the packing retainer and the top of the valve body above where the pressure gauge is mounted. NOTE: Failure to perform the inspection in exactly the location depicted may result in rejection of conforming product. (c) Perform visual inspection comparing the “Acceptable” or “Unacceptable” of the pin gauge. (Refer to Figure 5 for identification of acceptable cylinder and valve assembly) (Refer to Figure 6 for identification of unacceptable cylinder and valve assembly) ### Page 9 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 7 of 11 C2 - Confidential FIGURE 5 ACCEPTABLE ILLUSTRATION TO SHOW CLEARANCE BETWEEN PACKING RETAINER AND VALVE BODY FIGURE 6 REJECTED VALVE ASSEMBLY (4) If cylinder and valve assembly is identified as “Acceptable”, the cylinder and valve assembly may remain or can be used in service. PIN GAUGE 0.079 INCH (2.00 MM) ACCEPTABLE: THE PIN GAUGE FITS THE CLEARANCE >0.079 INCHES 2.00 MM REJECTED: THE PIN DOES NOT FIT THE CLEARANCE PIN GAUGE 0.079 INCH (2.00 MM) <0.079 INCHES 2.00 MM ### Page 10 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 8 of 11 C2 - Confidential D. Re-identification of equipment (1) Physically identify the acceptable cylinders after inspection by using an oil-based, blue paint permanent marker of local supply, to mark the valve with a blue paint dot as shown in Figure 7. FIGURE 7 MARK ACCEPTABLE CVA WITH A BLUE PAINT DOT (a) Please fill out the report form in Appendix 4 and send a copy to sao.avx.customerservice@safrangroup.com. WARNING: DO NOT OPEN OR CLOSE THE VALVE HANDLE IF A CVA IS REJECTED BASED ON THE INSPECTION. A CVA THAT IS IDENTIFIED AS UNACCEPTABLE AND IS PRESSURIZED CAN CAUSE SERIOUS INJURY TO PERSONNEL. (2) If CVA is installed on an aircraft with the valve in the open position, and it is identified as “Unacceptable” (the gap is too small to accommodate the pin gauge), do the following steps: (a) Follow aircraft manufacture’s documentation to completely bleed down the CVA through the appropriate aircraft systems. (b) Close the Valve Assembly. (c) Remove the CVA from service. (d) Clearly identify the CVA as non-conforming product / not-for-service. (e) Package CVA. NOTE: Alternate reaction plans may be advised at the discretion of the aircraft OEM based on additional system-level safety analysis. (f) Contact (sao.avx.customerservice@safrangroup.com) for instructions for shipping cylinders. ### Page 11 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 9 of 11 C2 - Confidential WARNING: DO NOT OPEN OR CLOSE THE VALVE HANDLE IF A CVA IS REJECTED BASED ON THE INSPECTION. A CVA THAT IS IDENTIFIED AS UNACCEPTABLE AND IS PRESSURIZED CAN CAUSE SERIOUS INJURY TO PERSONNEL. (3) If CVA is installed on an aircraft or is in storage with the valve in the closed position and it is identified as “Unacceptable” (the gap is too small to accommodate the pin gauge) do the following steps: (a) Remove the cylinder and valve assembly from service (if applicable) (b) Clearly identify the CVA as non-conforming product / not-for-service. (c) Package cylinder and valve assembly securely in a box that is compliant with HM224B. (d) Contact (sao.avx.customerservice@safrangroup.com) for instructions for shipping cylinders. E. Test No Test is required after the inspection F. Close-up None. 4. Appendix A. Appendix 1 thru 3 - Excel files with the suspect SN lists. “Appendix 1 Affected Shipments 10015804-35-03 R5.xlsx” “Appendix 2 Affected Shipments 10015804-35-03 R5.xlsx” “Appendix 3 Affected Shipments 10015804-35-03 R5.xlsx” NOTE: Appendix 1 has not been changed since the initial release of this SB. NOTE: Appendix 2 was added with revision 3 to this SB to include serial numbers manufactured from October 1, 2017 through December 2017, and additional serial numbers manufactured from January 2018 through November 2018. Appendix 2 has not been changed since revision 3 of this SB. NOTE: Appendix 3 was added with revision 4 of this SB. ### Page 12 (OCR) C2 - Confidential • SAFRAN AEROSYSTEMS Attachments Appendix 1 thru 3 Affected Shipments Appendix 1 Affected Shipments.. Name SAFRAN AEROSYSTEMS • Appendix 2 Affected Shipments.. * Appendix 3 Affected Shipments.. AVOX SYSTEMS INC 225 Erie Street Lancaster NY 14086-9502 USA Tel: 716-683-5100 Fax: 716-681-1089 (53655) SERVICE BULLETIN U.S. EXPORT REGULATIONS The technical data in this document (or file) is controlled for export under the Export Administration Regulations (EAR), 15 CFR Parts 730-774, ECCN: 9E991. Violations of these laws may be subject to fines and penalties under the Export Administration Act. SUBJECT: OXYGEN - CYLINDER - POSSIBLE MISSING COMPONENT ON OXYGEN CYLINDER AND VALVE ASSEMBLY B. Appendix 4 - Inspection Form. (See page 11) AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 10 of 11 ### Page 13 AEROSYSTEMS AVOX SYSTEMS INC PROPRIETARY Copyright © 2023 by Avox Systems Inc., SAFRAN Group. All rights reserved. The data contained in this recording are governed by the provisions of the contract and/or order under which they are provided. Any disclosure or reproduction, in whole or in part, other than that which has been in said contract is not permitted without the prior written permission of Avox Systems Inc. APR 11/2019 Rev 00 ALERT 10015804-35-03 SEP 29/2023 Rev 05 Page 11 of 11 C2 - Confidential INSPECTION OF MISSING GUIDE FROM CYLINDER AND VALVE ASSEMBLY FORM Company Name: Email: Phone: Service Bulletin Number: 10015804-35-03 Date: Company Address: CYLINDER & VALVE ASSY PART NUMBER: CYLINDER & VALVE ASSY SERIAL NO: VALVE ASSY PART NUMBER VALVE ASSY SERIAL NUMBER MANUFACTURE DATE: ACCEPTABLE: (YES/NO) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.