2025-21-01: Aircraft Fuel System

1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. 2. The FAA amends § 39.13 by: a. Removing Airworthiness Directive 2025-11-10, Amendment 39-23056 (90 FR 23269, June 2, 2025); and b. Adding the following new airworthiness directive: 2025-21-01 Cameron Balloons Ltd.: Amendment 39-23173; Docket No. FAA-2025-3433; Project Identifier MCAI-2025-01302-Q. (a) Effective Date This airworthiness directive (AD) is effective October 27, 2025. (b) Affected ADs This AD replaces AD 2025-11-10, Amendment 39-23056 (90 FR 23269, June 2, 2025) (AD 2025-11-10). (c) Applicability (1) This AD applies to all hot air balloons, certificated in any category, with a fuel cylinder installed that is fitted with Cameron Balloons Ltd. pressure relief valve (PRV) adaptor part number (P/N) CB8426. Note 1 to paragraph (c)(1): Cameron Balloons Alert Service Bulletin No. 36, Revision 2, dated July 3, 2025, provides information related to this AD, including fuel cylinders that may be fitted with PRV adaptor P/N CB8426. (2) These fuel cylinders are installed on hot air balloon models including, but not limited to, those of the design approval holders identified in paragraphs (c)(2)(i) through (viii) of this AD. (i) Adams Aerostats LLC. (ii) Aerostar International Inc. (iii) Ballonbau Wörner GmbH. (iv) Cameron Balloons Ltd. (v) Eagle Balloons Corp. (vi) JR Aerosports, Ltd. (vii) Kubí?ek Factory s.r.o. (formerly Balóny Kubí?ek spol. s.r.o.). (viii) Lindstrand Balloons Ltd. (d) Subject Joint Aircraft System Component (JASC) Code 2800, Aircraft Fuel System. (e) Unsafe Condition This AD was prompted by cracks on the upper hex portion of PRV adaptors installed on certain Cameron Balloons Ltd. fuel cylinders. The FAA is issuing this AD to address failure of a PRV adaptor. This condition, if not addressed, could lead to uncontrolled leakage of liquefied petroleum gas, which could result in an in-flight fire and consequent emergency landing. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Required Actions (1) Before further flight after the effective date of this AD and thereafter before each flight, visually check the fuel cylinder PRV adaptor for any cracks. (2) The owner/operator (pilot) holding at least a private pilot certificate may perform the visual checks required by paragraph (g)(1) of this AD and must enter compliance with the applicable paragraph of this AD into the balloon maintenance records in accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439. (3) Replace the fuel cylinder PRV adaptor with a fuel cylinder PRV adaptor having P/N CB7922 at whichever compliance time in paragraph (g)(3)(i) or (ii) occurs first. (i) Before further flight if any crack is found during any visual check required by paragraph (g)(1) of this AD. (ii) At or before the next scheduled periodic PRV inspection. (4) The replacement required by paragraph (g)(3) of this AD terminates the repetitive visual check requirement of paragraph (g)(1) of this AD. (h) Special Flight Permits Special flight permits are prohibited. (i) Alternative Methods of Compliance (AMOCs) The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph (j)(1) of this AD and email to [email protected] . Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office. (j) Additional Information (1) For more information about this AD, contact George Weir, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (817) 222-4045; email: [email protected] . (2) For material identified in this AD that is not incorporated by reference, contact Cameron Balloons Ltd., St John Street, Bedminster, Bristol, BS3 4NH, United Kingdom; phone: +44 0 117 9637216; email: [email protected] ; website: cameronballoons.co.uk . (k) Material Incorporated by Reference None. Issued on October 7, 2025. Steven W. Thompson, Acting Deputy Director, Compliance & Airworthiness Division, Aircraft Certification Service. [FR Doc. 2025-19532 Filed 10-9-25; 8:45 am]BILLING CODE 4910-13-P