# Bell Alert Service Bulletin 505-21-21: No revision named - Rights: © Bell Textron Inc. Filed by the FAA in regulations.gov docket FAA-2024-1296, the docket of AD 2024-15-10. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Bell Alert Service Bulletin 505-21-21](https://openairdocs.org/service-documents/bell/sb-505-21-21.md) - Title as filed: Bell ASB 505-21-21 - Pages: 5 - PDF: https://openairdocs.org/files/sha256/4e/6e/4e6e6f86bfa4d8e21320c49b48ef28b4377b3b7d0a8eced249154ebe303b8b90 - Page: https://openairdocs.org/service-documents/bell/sb-505-21-21/file/4e6e6f86bfa4 ## Text 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 ASB 505-21-21 Page 1 of 5 Approved for public release. ALERT SERVICE BULLETIN 505-21-21 PSL #662 8 June 2021 MODEL AFFECTED: 505 SUBJECT: SUMP DRAIN FITTING GROMMET NAS557 -18C, INSTALLATION OF HELICOPTERS AFFECTED: Serial number s 65011 through 65291, 65294 through 65302, 65306, 65307, 65312, 65314 through 65332, 65334 through 65339, 65341 through 65343, 65345 and 65346. [Serial number 65292, 65293, 65303 through 65305, 65308 through 65311, 65313, 65333, 65340, 65344, 65347 and subsequent will have the intent of this bulletin accomplished prior to delivery.] COMPLIANCE: At next convenient maintenance opportunity but no later than 31 May 2022 DESCRIPTION: During airframe drop testing activity, it was discovered that by adding a frangible split plastic grommet interface to the airframe cutout where the sump drain fitting passes through provided an additional safeguard to the integrity of this installation following an impact. This Alert Service Bulletin (ASB) provides instructions to install this split plastic grommet which is considered as a safety improvement. Applicability of this bulletin to any spare part shall be determined prior to its installation on an affected helicopter. APPROVAL: ### Page 2 ASB 505-21-21 Page 2 of 5 Approved for public release. The engineering design aspects of this bulletin are Transport Canada Civil Aviation (TCCA) approved. CONTACT INFO: For any questions regarding this bulletin, please contact: Bell Product Support Engineering Tel: 1-450-437-2862 / 1-800-363-8023 / productsupport@bellflight.com MANPOWER: Approximately 1 man-hour is required to complete this bulletin. This estimate is based on hands-on time and may vary with personnel and facilities available. WARRANTY: Owners / Operators of Bell Helicopters who comply with the instructions in this bulletin will be eligible to rec eive non prorated replacement part as applicable, listed in the MATERIAL section bulletin. Bell has recently introduced enhancements to the “My Bell Portal” which allocates specific warranty entitlement for an aircraft by serial number. The Product Service Letter (PSL) number which will be listed below the bulletin number on the introduction page. This is going to be a required field when submitting a claim on the Bulletins Tab for replacement parts, labor, and/or freight. If you receive an ASB or TB that does not have a PSL number, then there is no warranty entitlement for that bulletin. Labor entitlement: Yes, one (1) labor hours for replacement and install at $ 95 USD per hour To receive parts, labor, under warranty: • Comply with the instructions contained in this Bulletin no later than the applicable date in the “compliance section”. • If there is a PSL number identified in the bulletin you will be required to enter this PSL number which will validate warranty entitlement for the selected aircraf t. Please ensure that you use the Bulletin tab when you file your claim. Customers who fail to comply with the instructions in this Bulletin before the 31 May 2022 will not be eligible for the special warranty listed above. MATERIAL: Required Material: The following material is required for the accomplishment of this bulletin and may be obtained through your Bell Supply Center. ### Page 3 ASB 505-21-21 Page 3 of 5 Approved for public release. Part Number Nomenclature Qty (Note) NAS557-18C Split Plastic Grommet 1 Consumable Material: None required. SPECIAL TOOLS: None required. WEIGHT AND BALANCE: Not affected. ELECTRICAL LOAD DATA: Not affected. REFERENCES: BHT-505-MM Maintenance Manual PUBLICATIONS AFFECTED: BHT-505-IPC Illustrated Parts Catalog, Chapter 28 BHT-505-MM Maintenance Manual, Chapter 28 ACCOMPLISHMENT INSTRUCTIONS: 1. Prepare the helicopter for maintenance. 2. Gain access to the fuel filler compartment (Zone 172), DMC-505-A-06-30-00-00A- 030A-A. 3. Locate sump drain port fitting (Figure 1). -NOTE- If necessary to ease fuel cell movement, loosen the fuel filler retainer hardware prior to installation of Split Plastic Grommet and retighten the fuel filler retainer hardware thereafter , (DMC-505-A-28-10-11-00A-520A-A, DMC-505-A-28-10-11- 00A-720A-A) (Figure 1). ### Page 4 ASB 505-21-21 Page 4 of 5 Approved for public release. a. Push in position NAS557-18C Split Plastic Grommet groove around periphery of the airframe hole cut out for sump drain port fitting (Figure 1). (1) Locate split line at 12 o’clock position. 4. Close access to the fuel filler compartment (Zone 172), DMC-505-A-06-30-00-00A- 030A-A. 5. Make an entry in the helicopter logbook and historical service records indicating compliance with this Alert Service Bulletin. ### Page 5 (OCR) Push in position NAS557-18C Split Plastic Grommet groove around periphery of the sump drain port fitting airframe hole cut out for sump drain port fitting. Locate split line at 12 o'clock position. SUMP DRAIN FUEL SO ROMER ASSY 15.080•3/0-00 3 op. 357 19924 DATE: 19-06-19 If necessary to ease fuel cell movement, loosen the fuel filler retainer hardware prior to installation of Split Plastic Grommet and retighten the fuel filler retainer hardware thereafter, (DMC-505-A-28-10- 11-00A-520A-A, DMC-505-A-28-10-11-00A-720A- FIGURE 1 - Fuel Filler Compartment (Zone 172) ASB 505-21-21 Page 5 of 5 Approved for public release. --- 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.