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  4. Part 25
  5. § 25.1721
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14 CFR · Part 25

14 CFR § 25.1721

Protection of EWIS.

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Read in Subpart H
Part 25 Contents
  • Special Federal Aviation Regulation No. 13
  • Special Federal Aviation Regulation No. 109
  • Subpart A: General
  • Subpart B: Flight
  • Subpart C: Structure
  • Subpart D: Design and Construction
  • Subpart E: Powerplant
  • Subpart F: Equipment
  • Subpart G: Operating Limitations and Information
  • Subpart H: Electrical Wiring Interconnection Systems (EWIS)
  • Subpart I: Special Federal Aviation Regulations
  • Appendix A to Part 25
  • Appendix B to Part 25
  • Appendix C to Part 25
  • Appendix D to Part 25
  • Appendix E to Part 25
  • Appendix F to Part 25
  • Appendix H to Part 25: Instructions for Continued Airworthiness
  • Appendix I to Part 25: Installation of an Automatic Takeoff Thrust Control System (ATTCS)
  • Appendix J to Part 25: Emergency Evacuation
  • Appendix K to Part 25: Extended Operations (ETOPS)
  • Appendix L to Part 25: HIRF Environments and Equipment HIRF Test Levels
  • Appendix M to Part 25: Fuel Tank System Flammability Reduction Means
  • Appendix N to Part 25: Fuel Tank Flammability Exposure and Reliability Analysis
  • Appendix O to Part 25: Supercooled Large Drop Icing Conditions
(a)

No cargo or baggage compartment may contain any EWIS whose damage or failure may affect safe operation, unless the EWIS is protected so that:

(1)

It cannot be damaged by movement of cargo or baggage in the compartment.

(2)

Its breakage or failure will not create a fire hazard.

(b)

EWIS must be designed and installed to minimize damage and risk of damage to EWIS by movement of people in the airplane during all phases of flight, maintenance, and servicing.

(c)

EWIS must be designed and installed to minimize damage and risk of damage to EWIS by items carried onto the aircraft by passengers or cabin crew.

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

  • Official Source (14 CFR · Part 25)