# 14 C.F.R. § 27.1309 (2026): Equipment, systems, and installations

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1309

## Section

- **Citation:** 14 C.F.R. § 27.1309 (2026)
- **Heading:** Equipment, systems, and installations
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 14 CFR: Aeronautics and Space / Chapter I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION / Part 27: AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT / Subpart F: Equipment / § 27.1309: § 27.1309   Equipment, systems, and installations.

## Text

The equipment, systems, and installations whose functioning is required by this subchapter must be designed and installed to ensure that they perform their intended functions under any foreseeable operating condition. For any item of equipment or system whose failure has not been specifically addressed by another requirement in this chapter, the following requirements also apply:
(a) The design of each item of equipment, system, and installation must be analyzed separately and in relation to other rotorcraft systems and installations to determine and identify any failure that would affect the capability of the rotorcraft or the ability of the crew to perform their duties in all operating conditions.
(b) Each item of equipment, system, and installation must be designed and installed so that:
(1) The occurrence of any catastrophic failure condition is extremely improbable;
(2) The occurrence of any major failure condition is no more than improbable; and
(3) For the occurrence of any other failure condition between major and catastrophic, the probability of the failure condition must be inversely proportional to its consequences.
(c) A means to alert the crew in the event of a failure must be provided when an unsafe system operating condition exists and to enable them to take corrective action. Systems, controls, and associated monitoring and crew alerting means must be designed to minimize crew errors that could create additional hazards.
(d) Compliance with the requirements of this section must be shown by analysis and, where necessary, by ground, flight, or simulator tests. The analysis must account for:
(1) Possible modes of failure, including malfunctions and misleading data and input from external sources;
(2) The effect of multiple failures and latent failures;
(3) The resulting effects on the rotorcraft and occupants, considering the stage of flight and operating conditions; and
(4) The crew alerting cues and the corrective action required.
[Amdt. 27-51, 88 FR 8737, Feb. 10, 2023]

## Nearby sections

- [14 C.F.R. § 27.1301 (2026) § 27.1301   Function and installation.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1301.md)
- [14 C.F.R. § 27.1303 (2026) § 27.1303   Flight and navigation instruments.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1303.md)
- [14 C.F.R. § 27.1305 (2026) § 27.1305   Powerplant instruments.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1305.md)
- [14 C.F.R. § 27.1307 (2026) § 27.1307   Miscellaneous equipment.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1307.md)
- [14 C.F.R. § 27.1309 (2026) § 27.1309   Equipment, systems, and installations.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1309.md)
- [14 C.F.R. § 27.1316 (2026) § 27.1316   Electrical and electronic system lightning protection.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1316.md)
- [14 C.F.R. § 27.1317 (2026) § 27.1317   High-intensity Radiated Fields (HIRF) Protection.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1317.md)
- [14 C.F.R. § 27.1321 (2026) § 27.1321   Arrangement and visibility.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1321.md)
- [14 C.F.R. § 27.1322 (2026) § 27.1322   Warning, caution, and advisory lights.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1322.md)
- [14 C.F.R. § 27.1323 (2026) § 27.1323   Airspeed indicating system.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1323.md)
- [14 C.F.R. § 27.1325 (2026) § 27.1325   Static pressure systems.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1325.md)
- [14 C.F.R. § 27.1327 (2026) § 27.1327   Magnetic direction indicator.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1327.md)
- [14 C.F.R. § 27.1329 (2026) § 27.1329   Automatic pilot and flight guidance system.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1329.md)
- [14 C.F.R. § 27.1337 (2026) § 27.1337   Powerplant instruments.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1337.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1309. Check the current official text before relying on it. Not legal advice.