AC 120-17B

editorial update

Advisory circular · Reliability Program Methods—Standards for Determining Time Limitations

Approved
July 9, 2026
Last reviewed
July 10, 2026
This change
Editorial update of AC 120-17B.
Cancels
AC120-17B
Family
AC 120-17 · 3 versions
Revision
B
14 CFR parts
5, 91, 119, 121, 135

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed July 10, 2026.

Show pages 38–49
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Appendix I APPENDIX I. REGULATORY SOURCED REQUIREMENTS Regulatory Sourced Task Note 1. Examples include:

AD, CM Rs, AL, AL, FTS tasks.

Does the Ensure regulatory regulatory authority or authority or source source requirement contain specific -Yes-• requirements are followed.

instructions for task adjustment?

No Ensure data selection criteria conforms with guidance in this AC (or as accepted by carrier's CMO).

Note 2. Relative to the targeted failure mode and original intent.

Refer to MSG-3 section 2-3-7.1 analysis substantate Does (Table 2-3-7.1, Criteria for Task adjustment of the task Selection) for applicability and safety interval and remain effectiveness guidance. No effective? * Coordinate with the TCH when data from the MSG-3 task analysis is necessary to perform the evaluation.

Submit proposal to the regulatory authority/ source requirement holder.

Was approval obtained from the regulatory authority/ source requirement holder?

Revise task as approved.

End I-1

OMB Control Number: 2120-0746 Expiration Date:12/31/2027 Advisory Circular Feedback Form Paperwork Reduction Act Burden Statement: A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a currently valid OMB Control Number. The OMB Control Number for this information collection is 2120-0746. Public reporting for this collection of information is estimated to be approximately 20 minutes per response, including the time for reviewing instructions, searching existing data sources, gathering, and maintaining the data needed, completing, and reviewing the collection of information.

All responses to this collection of information are voluntary. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to:

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If you find an error in this Advisory Circular, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by emailing this form to the Flight Standards Directives Management Officer at 9-AWA-AFB-120-Directives@faa.gov.

Subject: AC 120-17B, Reliability Program Methods—Standards for Determining Time Limitations Date: _____________________ Please mark all appropriate line items:

☐ An error (procedural or typographical) has been noted in paragraph ____________ on page _______.

☐ Recommend paragraph _____________ on page __________ be changed as follows:

☐ In a future change to this AC, please cover the following subject:

(Briefly describe what you want added.)

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Submitted by: Date: ______________________ FAA 1320-73 (01/25) SUPERSEDES PREVIOUS EDITIONS