Airworthiness Directive · Amendment 39-23495 · Engine fuel and control
Pratt and Whitney Division Engines
The FAA has filed this AD for publication in the Federal Register on October 19, 2026. This page shows the public-inspection copy and is replaced by the published text when it appears. Its effective date is set at publication.
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.
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) Model PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4460, and PW4462 engines. 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. This AD requires replacing Pb sensors. The FAA is issuing this AD to address the unsafe condition on these products.
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.
(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.
| 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 |
(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.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
