# 2026-01152: FAA Orders Engine Vibes Check After Takeoff Fiascos

2026-01152, Airworthiness Directives; CFM International, S.A. Engines, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2026-01-22, effective 2026-02-26 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-01152
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-01152
- Title: Airworthiness Directives; CFM International, S.A. Engines
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 91 FR 2684
- Published: 2026-01-22
- Effective: 2026-02-26
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 2120-AA64
- Last updated: 2026-06-11

## In one line

FAA Orders Engine Vibes Check After Takeoff Fiascos

## Summary

The FAA is rolling out new safety rules for certain CFM LEAP engines after spotting a problem that caused aborted takeoffs and emergency turns. Pilots and maintenance crews will need to check engine vibrations and inspect key parts regularly, replacing some worn components during the next shop visit. These changes kick in on February 26, 2026, helping keep flights safe without breaking the bank.

## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP- 1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines. This AD was prompted by a report of multiple aborted takeoffs and air turn-backs (ATBs) caused by high-pressure compressor (HPC) stall, which was induced by high levels of non-synchronous vibration (NSV). Additional manufacturer investigation revealed that wear on the No. 3 bearing spring finger housing can lead to high levels of NSV. This AD requires initial and repetitive calculations of the levels of NSV, inspection of the stage 2 high-pressure turbine (HPT) nozzle assembly honeycomb and HPT stator stationary seal honeycomb and, depending on the results of the calculations and inspections, replacement of certain parts. This AD also requires replacement of certain No. 3 bearing spring finger housings at the next shop visit. The FAA is issuing this AD to address the unsafe condition on these products.

## Effects PRIA read

- Every-50-Cycle NSV Monitoring Required: cost, high. If your airplane has an affected CFM LEAP-1A engine, you must calculate non-synchronous vibration (NSV) within 50 flight cycles after February 26, 2026 and then at intervals not to exceed 50 flight cycles. If NSV exceeds specified thresholds, you must remove the identified No. 3 bearing spring fing…
- Mandatory Replacement at Next Shop Visit: cost, high. At the next shop visit after February 26, 2026, operators must replace any No. 3 bearing spring finger housing with part number 2629M62G01 and a serial number listed in Table 1 of the referenced CFM service bulletin with a part eligible for installation. That replacement also serves as terminating…
- Estimated Compliance and On‑Condition Costs: cost, high. The FAA estimates per-engine costs: $85 to calculate NSV, $340 to inspect the stage 2 HPT nozzle assembly and HPT stator stationary seal, and $66,035 to replace the No. 3 bearing spring finger housing (17 work-hours plus $64,590 parts). The AD affects three engines on U.S. registry, giving an estim…
- Prevents HPC Stall and Power Loss: benefit, high. The AD is intended to prevent high-pressure compressor (HPC) stall caused by high non-synchronous vibration (NSV) and wear on the No. 3 bearing spring finger housing. The FAA warns that, if not addressed, the condition could lead to engine power loss during takeoff or climb, loss of thrust control,…

## Related documents

- [2026-15585](https://policyrisk.com/federal-register/2026-15585): Requirements for Interference-Tolerant Radio Altimeter Systems, 2026-07-31
- [2026-13440](https://policyrisk.com/federal-register/2026-13440): Enabling Supersonic Overland Flight, 2026-07-02
- [2026-13126](https://policyrisk.com/federal-register/2026-13126): Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility; Extension of Comment Period, 2026-06-30
- [2026-08943](https://policyrisk.com/federal-register/2026-08943): Designation-Restrict the Operation of Unmanned Aircraft in Close Proximity to a Fixed Site Facility, 2026-05-06
- [2025-04846](https://policyrisk.com/federal-register/2025-04846): Extension of the Prohibition Against Certain Flights in the Territory and Airspace of Libya, 2025-03-20
- [2025-03853](https://policyrisk.com/federal-register/2025-03853): Enforcement Policy Regarding “Drug and Alcohol Testing of Certificated Repair Station Employees Located Outside of the United States; Corre…, 2025-03-11

## Sources
- [2026-01152 on federalregister.gov](https://www.federalregister.gov/documents/2026/01/22/2026-01152/airworthiness-directives-cfm-international-sa-engines)
- [2026-01152 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-01-22/pdf/2026-01152.pdf)

## Related
- [Previous: 2026-01150, Fisheries Off West Coast States; Pacific Coast Groundfish Fishery; Emergency Ac…](https://policyrisk.com/federal-register/2026-01150)
- [Next: 2026-01167, Enhanced Air Cargo Advance Screening (ACAS); Corrections](https://policyrisk.com/federal-register/2026-01167)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-01152 (as of 2026-06-11).