2026-21-06: Engine Fuel and Control

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 adding the following new airworthiness directive: 2026-21-06 Pratt & Whitney Division: Amendment 39-23495; Docket No. FAA-2026-4643; Project Identifier AD-2025-01612-E. (a) Effective Date This airworthiness directive (AD) is effective November 23, 2026. (b) Affected ADs None. (c) Applicability This AD applies to all Pratt & Whitney Division (PW) Model PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4460, and PW4462 engines. (d) Subject Joint Aircraft System Component (JASC) Code 7300, Engine Fuel and Control. (e) Unsafe Condition This AD was prompted by multiple reports of tailpipe fire, loss of thrust control, and engine in-flight shutdown due to undetected deterioration of pressure burner (Pb) sensors. The FAA is issuing this AD to detect and correct the deterioration of Pb sensors. The unsafe condition, if not addressed, could result in engine fire, loss of thrust control, and engine in-flight shutdown. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Definitions For the purpose of this AD, a "part eligible for installation" is a Pb sensor that has accumulated less than 30,000 flight hours (FH) since new or since last repair and less than 10 years since new or since last repair. (h) Required Actions (1) Replace the Pb sensor within the electronic engine control (EEC) with a part eligible for installation within the applicable number of months after the effective date of this AD, as specified in table 1 to paragraph (h) of this AD, and thereafter before accumulating 30,000 FH since new or since last repair, or before accumulating 10 years since new or since last repair, whichever occurs first. Table 1 to Paragraph ( h )-P b Sensor Replacement Times Years since new or since last repair as of the effective date of this AD 60,000 FH or more since new or since last repair as of the effective date of this AD * (months) 50,000-59,999 FH since new or since last repair as of the effective date of this AD * (months) 40,000-49,999 FH since new or since last repair as of the effective date of this AD * (months) 30,000-39,999 FH since new or since last repair as of the effective date of this AD * (months) Less than 30,000 FH since new or since last repair as of the effective date of this AD * (months) Unknown FH since new or since last repair as of the effective date of this AD * (months) 16 or more years 10 10 10 10 10 10 At or more than 14 years but less than 16 years 10 14 14 14 14 10 At or more than 12 years but less than 14 years 10 14 21 21 21 10 At or more than 10 years but less than 12 years 10 14 21 30 30 10 Less than 10 years 10 14 21 30 Refer to paragraph (h)(2) of this AD 10 Unknown years 10 10 10 10 10 10 * Flight hours since new or since last repair: Calculate by rounding to the nearest hour. (2) For Pb sensors that have accumulated less than 30,000 FH since new or since last repair and less than 10 years since new or since last repair as of the effective date of this AD, replace the Pb sensor within the EEC with a part eligible for installation as follows, whichever occurs later: (i) Before accumulating 30,000 FH or 10 years since new or since last repair as applicable, whichever occurs first. (ii) Within 30 months after the effective date of this AD. Note 1 to paragraph (h): Guidance for determining the age of Pb sensors may be found in PW Service Bulletin PW4ENG 73-221, Revision No. 3, dated July 1, 2024. (i) Alternative Methods of Compliance (AMOCs) (1) The Manager, AIR-520 Continued Operational Safety 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 AIR-520 Continued Operational Safety Branch, send it to the attention of the person identified in paragraph (j) of this AD and email to: [email protected]. (2) 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 Molly Sturgis, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (562) 627-5373; email: [email protected] . (2) For material identified in this AD that is not incorporated by reference, contact PW, 400 Main Street, East Hartford, CT 06118; phone: (800) 565-0140; email: [email protected]; website: connect.prattwhitney.com. (k) Material Incorporated by Reference None. Issued on October 14, 2026. Lona C. Saccomando, Acting Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service. [FR Doc. 2026-21290 Filed 10-16-26; 8:45 am]BILLING CODE 4910-13-P