AC 120-17B

Historical

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

A newer version is currentThis is a historical version. AC 120-17B Ed Update is the version in force, approved July 9, 2026.
Approved
December 19, 2018
Last reviewed
August 6, 2024
Cancels
AC120-17A
Family
AC 120-17 · 3 versions
Revision
B
14 CFR parts
91, 119, 121, 135

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

Show pages 36–47
Page 48OCROpen in PDF

Appendix G APPENDIX G. LIGHTNING/HIGH INTENSITY RADIATED FIELDS (L/HIRF) TASKS Note 1. Coordination with OEM is L/HIRF Task ' recommended. L/HIRF protection may include:

- Wires, shields, connectors, bonding straps, raceways between connectors.

- L/HIRF protection within conduit or Review TCH ICA heat shrink or other covering. rules.

- Non-metallic structure with conductive mesh and/or antistatic coatings.

Ensure TCH ICA rules are followed, if applicable.

Ensure data selection criteria conforms with guidance in this AC (or as accepted by carrier's CMO).

Perform analysis of appropriate data. 2 Note 2: Analysis should consider:

- The environment and effects of corrosive products, condensation, temperature, and vibration on the protection. Does the

- Susceptibility of damage during maintenance or analysis operations (e.g., where connectors could be stepped substantiate a task interval and/or scope revision that -No on, or effects of deicing fluid on a connector during maintains acceptable levels winter operations. of L/HIRF

- Scheduled maintenance findings associated with protection?

bonding straps, lightning wicks, tank plates wiring/ connector bonding, etc.

Yes Revise task scope, type, and/or interval.

End G-1

Page 49OCROpen in PDF

Appendix H APPENDIX H. OPERATOR PROGRAMS AND APPEARANCE Note 1. This decision tree applies to Operator Program tasks developed and implemented by the operator, such as: and Appearance Tasks 1

- Tasks that support other tasks;

- Administrative support tasks;

- Branding/image objectives; and standards established by the operator. - Cabin appearance and cleanliness task a response, Is this Appendix A; or other defined or is it otherwise related to a deficiency in the Yes→ analysis process operator's CAMP?

No Based on risk, determine the data set and analysis needed to evaluate the proposed change Does the Is the analysis anticipated impact +No- substantiate a acceptable? revised or deleted task?

No Yes Yes Delete or revise task scope, type, and/or accomplishment interval.

End H-1

Page 50OCROpen in PDF

Appendix I APPENDIX I. REGULATORY SOURCED REQUIREMENTS Regulatory Sourced Task ' Note 1. Examples include:

AD, CMRS, ALI, AL, and FTS tasks.

Does the Ensure regulatory regulatory authority/ authority source source requirement contain specific YesT requirements are instructions for task followed.

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.

Does Refer to MSG-3 section 2-3-7.1 analysis substantiate (Table 2-3-7.1, Criteria for Task adjustment of the task Selection) for applicability and safety interval and remain effectiveness guidance. No effective? 2 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 No holder?

Yes Revise task as approved.

End I-1

Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the Flight Standards Directives Management Officer at 9-AWA-AFS-140-Directives@faa.gov.

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

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