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  4. Part 121
  5. § 121.358
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14 CFR · Part 121

14 CFR § 121.358

Low-altitude windshear system equipment requirements.

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Read in Subpart K
Part 121 Contents
  • Subpart A: General
  • Subpart E: Approval of Routes: Domestic and Flag Operations
  • Subpart F: Approval of Areas and Routes for Supplemental Operations
  • Subpart G: Manual Requirements
  • Subpart H: Aircraft Requirements
  • Subpart I: Airplane Performance Operating Limitations
  • Subpart J: Special Airworthiness Requirements
  • Subpart K: Instrument and Equipment Requirements
  • Subpart L: Maintenance, Preventive Maintenance, and Alterations
  • Subpart M: Airman and Crewmember Requirements
  • Subpart N: Training Program
  • Subpart O: Crewmember Qualifications
  • Subpart P: Aircraft Dispatcher Qualifications and Duty Time
  • Subpart Q: Flight Time Limitations and Rest Requirements: Domestic Operations
  • Subpart R: Flight Time Limitations: Flag Operations
  • Subpart S: Flight Time Limitations: Supplemental Operations
  • Subpart T: Flight Operations
  • Subpart U: Dispatching and Flight Release Rules
  • Subpart V: Records and Reports
  • Subpart W: Crewmember Certificate: International
  • Subpart X: Emergency Medical Equipment and Training
  • Subpart Y: Advanced Qualification Program
  • Subpart Z: Hazardous Materials Training Program
  • Subpart AA: Continued Airworthiness and Safety Improvements
  • Subpart DD: Special Federal Aviation Regulations
  • Appendix A to Part 121: First Aid Kits and Emergency Medical Kits
  • Appendix B to Part 121: Airplane Flight Recorder Specification
  • Appendix C to Part 121: C-46 Nontransport Category Airplanes
  • Appendix D to Part 121: Criteria for Demonstration of Emergency Evacuation Procedures Under § 121.291
  • Appendix E to Part 121: Flight Training Requirements
  • Appendix F to Part 121: Proficiency Check Requirements
  • Appendix G to Part 121: Doppler Radar and Inertial Navigation System (INS): Request for Evaluation; Equipment and Equipment Installation; Training Program; Equipment Accuracy and Reliability; Evaluation Program
  • Appendix H to Part 121: Advanced Simulation
  • Appendix K to Part 121: Performance Requirements for Certain Turbopropeller Powered Airplanes
  • Appendix L to Part 121: Type Certification Regulations Made Previously Effective
  • Appendix M to Part 121: Airplane Flight Recorder Specifications
  • Appendix O to Part 121: Hazardous Materials Training Requirements For Certificate Holders
  • Appendix P to Part 121: Requirements for ETOPS and Polar Operations
(a)

Airplanes manufactured after January 2, 1991. No person may operate a turbine-powered airplane manufactured after January 2, 1991, unless it is equipped with either an approved airborne windshear warning and flight guidance system, an approved airborne detection and avoidance system, or an approved combination of these systems.

(b)

Airplanes manufactured before January 3, 1991. Except as provided in paragraph (c) of this section, after January 2, 1991, no person may operate a turbine-powered airplane manufactured before January 3, 1991 unless it meets one of the following requirements as applicable.

(1)

The makes/models/series listed below must be equipped with either an approved airborne windshear warning and flight guidance system, an approved airborne detection and avoidance system, or an approved combination of these systems:

(i)

A-300-600;

(ii)

A-310—all series;

(iii)

A-320—all series;

(iv)

B-737-300, 400, and 500 series;

(v)

B-747-400;

(vi)

B-757—all series;

(vii)

B-767—all series;

(viii)

F-100—all series;

(ix)

MD-11—all series; and

(x)

MD-80 series equipped with an EFIS and Honeywell-970 digital flight guidance computer.

(2)

All other turbine-powered airplanes not listed above must be equipped with as a minimum requirement, an approved airborne windshear warning system. These airplanes may be equipped with an approved airborne windshear detection and avoidance system, or an approved combination of these systems.

(c)

Extension of the compliance date. A certificate holder may obtain an extension of the compliance date in paragraph (b) of this section if it obtains FAA approval of a retrofit schedule. To obtain approval of a retrofit schedule and show continued compliance with that schedule, a certificate holder must do the following:

(1)

Submit a request for approval of a retrofit schedule by June 1, 1990, to the appropriate Flight Standards division manager in the responsible Flight Standards office.

(2)

Show that all of the certificate holder's airplanes required to be equipped in accordance with this section will be equipped by the final compliance date established for TCAS II retrofit.

(3)

Comply with its retrofit schedule and submit status reports containing information acceptable to the Administrator. The initial report must be submitted by January 2, 1991, and subsequent reports must be submitted every six months thereafter until completion of the schedule. The reports must be submitted to the certificate holder's assigned Principal Avionics Inspector.

(d)

Definitions. For the purposes of this section the following definitions apply—

(1)

Turbine-powered airplane includes, e.g., turbofan-, turbojet-, propfan-, and ultra-high bypass fan-powered airplanes. The definition specifically excludes turbopropeller-powered airplanes.

(2)

An airplane is considered manufactured on the date the inspection acceptance records reflect that the airplane is complete and meets the FAA Approved Type Design data.

Referenced By

Interpretations of This Section (1)

  • Ziemer (SeaborneAirlines), 2012

Documents that cite this section, found in their catalog metadata or text. Listed by date, not by significance.

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 121)