# Proposed AD FAA-2023-1050: Honeywell International Inc. Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2023-24-04
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 23, 2023, 88 FR 32980
- Comments due: July 7, 2023
- Became: [AD 2023-24-04](https://openairdocs.org/ad/2023-24-04)
- Docket: FAA-2023-1050 (https://www.regulations.gov/docket/FAA-2023-1050, where comments are filed)
- Project: AD-2022-00602-E
- FR document: 2023-10817
- Official PDF: https://openairdocs.org/files/sha256/19/f4/19f46bb919b9ff154dec72a35655a5483d2ab548e73d152f4ac05dfd5964e64e (from https://www.govinfo.gov/content/pkg/FR-2023-05-23/pdf/2023-10817.pdf)
- Federal Register: https://www.federalregister.gov/documents/2023/05/23/2023-10817/airworthiness-directives-honeywell-international-inc-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2023-10817-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2023-1050

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Honeywell International Inc. Model AS907-1-1A and AS907-2-1G engines. This proposed AD was prompted by reports of compressor surge, including a dual engine compressor surge, during takeoff climb out through a steep temperature inversion, causing a loss of engine thrust control. This proposed AD would require either the replacement of a certain electronic control unit (ECU) software version installed on AS907-1-1A engines with updated software or the replacement of certain ECUs installed on AS907-1-1A engines with ECUs eligible for installation. This proposed AD would also require the replacement of certain ECUs installed on AS907-2-1G engines with ECUs eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 23, 2023: Notice of proposed rulemaking (NPRM). (first notice), FR document 2023-10817, comments due Jul 7, 2023 (https://www.federalregister.gov/documents/2023/05/23/2023-10817/airworthiness-directives-honeywell-international-inc-engines)

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