# JASC 3421: Attitude Gyro and Indicating System - Type: JASC system/component code (FAA) - ATA chapter: 34 Navigation - Title in the code table: ATTITUDE GYRO AND IND. SYSTEM - Service difficulty reports: 1,142 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=38 - Page: https://openairdocs.org/jasc/3421 ## What it covers The gyroscopic unit which supplies attitude information to the necessary systems; for instance, vertical reference outputs for use as roll and pitch data to the autopilot computer. Includes the instruments operating by the gyroscopic principle, driven by air flow or an electric motor. Typical parts are vertical gyro and the gyro horizon. ## Latest service difficulty reports - [SDR A6WA202609298915](https://openairdocs.org/sdr/A6WA202609298915), Sep 29, 2026: INDICATOR, FAULTED (N469AW) - [SDR UIEA2026092000888](https://openairdocs.org/sdr/UIEA2026092000888), Sep 20, 2026: INDICATOR, FAILED (N496MC) - [SDR COEA2026081703856](https://openairdocs.org/sdr/COEA2026081703856), Aug 13, 2026: INDICATOR, FAULTED (N856FE) - [SDR DXTA2026080609116](https://openairdocs.org/sdr/DXTA2026080609116), Aug 2, 2026: MAGNETOMETER, DEFECTIVE (N333QS) - [SDR CALA2026072618020](https://openairdocs.org/sdr/CALA2026072618020), Jul 26, 2026: ADIRU, FAULTED (N78501) - [SDR CALA2026072417987](https://openairdocs.org/sdr/CALA2026072417987), Jul 21, 2026: WARNING MESSAGE, FALSE ACTIVATION (N14219) - [SDR ABXA20260612255](https://openairdocs.org/sdr/ABXA20260612255), Jun 12, 2026: IRU, FAULTED (N1427A) - [SDR N6WA2026061201](https://openairdocs.org/sdr/N6WA2026061201), Jun 4, 2026: WARNING FLAG, FALSE ACTIVATION (N576GJ) - [SDR CALA2026050816083](https://openairdocs.org/sdr/CALA2026050816083), May 6, 2026: IRU, FAULTED (N684UA) - [SDR CALA2026043015898](https://openairdocs.org/sdr/CALA2026043015898), Apr 28, 2026: ADIRU, FAULTED (N12754) - [SDR 141A2026042300001](https://openairdocs.org/sdr/141A2026042300001), Apr 23, 2026: INDICATOR, FAILED (N1983X) - [SDR G41A2026030900163](https://openairdocs.org/sdr/G41A2026030900163), Mar 6, 2026: DAU, FAULTED (N812RP) - [SDR CALA2026022614098](https://openairdocs.org/sdr/CALA2026022614098), Feb 24, 2026: ADIRU, FAULTED (N37253) - [SDR AALA202603067992](https://openairdocs.org/sdr/AALA202603067992), Feb 17, 2026: ADIRU, FAULTY (N335PH) - [SDR AALA202603068381](https://openairdocs.org/sdr/AALA202603068381), Feb 17, 2026: COMPUTER, FAULTY (N335PH) - [SDR SWAA2026012664114](https://openairdocs.org/sdr/SWAA2026012664114), Jan 23, 2026: ADIRU, FAULTED (N8888M) - [SDR ABXA202512264355](https://openairdocs.org/sdr/ABXA202512264355), Dec 24, 2025: GENERATOR, DEFECTIVE (N390CM) - [SDR CALA2025120911969](https://openairdocs.org/sdr/CALA2025120911969), Dec 6, 2025: AOA, MISSING (N77578) - [SDR CALA2025111911351](https://openairdocs.org/sdr/CALA2025111911351), Nov 17, 2025: INDICATOR, FAULTED (N77012) - [SDR QR9R2025100900002](https://openairdocs.org/sdr/QR9R2025100900002), Oct 9, 2025: INDICATOR, INOPERATIVE - [SDR AALA202507157128](https://openairdocs.org/sdr/AALA202507157128), Jul 14, 2025: ADIRU, FAILED (N809NN) - [SDR DALA2025063004848](https://openairdocs.org/sdr/DALA2025063004848), Jun 29, 2025: INDICATOR, MALFUNCTIONED (N833MH) - [SDR CALA2025052004858](https://openairdocs.org/sdr/CALA2025052004858), May 17, 2025: ADIRU, FAULTED (N16701) - [SDR QR9R2025032600001](https://openairdocs.org/sdr/QR9R2025032600001), Mar 26, 2025: GYRO, FAULTY - [SDR AALA202503177691](https://openairdocs.org/sdr/AALA202503177691), Mar 14, 2025: ADIRU, UNRELIABLE (N903NN) - [SDR AALA202503112076](https://openairdocs.org/sdr/AALA202503112076), Mar 10, 2025: ADIRU, FAILED (N921AN) - [SDR CALA2024122401642](https://openairdocs.org/sdr/CALA2024122401642), Dec 22, 2024: ADIRU, FAULTED (N66814) - [SDR CALA2024092002454](https://openairdocs.org/sdr/CALA2024092002454), Sep 19, 2024: MODULE, FAULTY (N73270) - [SDR CALA2024081300410](https://openairdocs.org/sdr/CALA2024081300410), Aug 11, 2024: ADIRU, FAULTY (N17312) - [SDR SWAA2024071512491](https://openairdocs.org/sdr/SWAA2024071512491), Jul 14, 2024: ADIRU, UNRELIABLE (N7737E) - [SDR DALA2024070206723](https://openairdocs.org/sdr/DALA2024070206723), Jul 1, 2024: DISPLAY, FAILED (N191DN) - [SDR AALA202405143917](https://openairdocs.org/sdr/AALA202405143917), May 13, 2024: TAT PROBE, FAULTY (N802NN) - [SDR A6WA202404288733](https://openairdocs.org/sdr/A6WA202404288733), Apr 28, 2024: INDICATOR, MALFUNCTIONED (N442AW) - [SDR AALA202402279798](https://openairdocs.org/sdr/AALA202402279798), Feb 25, 2024: ADIRU, FAULTY (N971AN) - [SDR AALA202402276369](https://openairdocs.org/sdr/AALA202402276369), Feb 25, 2024: ADIRU, FAULTY (N971AN) - [SDR AALA202402270569](https://openairdocs.org/sdr/AALA202402270569), Feb 25, 2024: DISPLAY, FAULTY (N971AN) - [SDR 2024F00037](https://openairdocs.org/sdr/2024F00037), Feb 18, 2024: GYRO, ABNORMAL (N92JQ) - [SDR 3NXA20240131002](https://openairdocs.org/sdr/3NXA20240131002), Jan 26, 2024: BATTERY PACK, FAILED INSP (N90SJ) - [SDR CALA2024011700129](https://openairdocs.org/sdr/CALA2024011700129), Jan 14, 2024: INDICATOR, FAULTED (N643UA) - [SDR M17F20230724097](https://openairdocs.org/sdr/M17F20230724097), Jul 8, 2023: TAT PROBE, FAILED (N958AM) - [SDR CALA2023062602009](https://openairdocs.org/sdr/CALA2023062602009), Jun 24, 2023: ADIRU, FAULTY (N76529) - [SDR DALA2023051503840](https://openairdocs.org/sdr/DALA2023051503840), May 12, 2023: UNKNOWN, UNKNOWN (N196DN) - [SDR CALA2023050301334](https://openairdocs.org/sdr/CALA2023050301334), May 3, 2023: ADIRU, UNKNOWN (N39415) - [SDR CALA2023042801281](https://openairdocs.org/sdr/CALA2023042801281), Apr 28, 2023: AIR DATA MODULE, FAULTED (N38403) - [SDR 2023F00090](https://openairdocs.org/sdr/2023F00090), Mar 9, 2023: INDICATOR, INOPERATIVE - [SDR CALA2023030100579](https://openairdocs.org/sdr/CALA2023030100579), Feb 28, 2023: ADIRU, FAILED (N37537) - [SDR JIKA2023022001](https://openairdocs.org/sdr/JIKA2023022001), Feb 20, 2023: INDICATOR, FAILED (N330AV) - [SDR DALA2023021501210](https://openairdocs.org/sdr/DALA2023021501210), Feb 11, 2023: NONE, NONE (N819NW) - [SDR A6WA202302048454](https://openairdocs.org/sdr/A6WA202302048454), Feb 4, 2023: NOT REPORTED, NOT REPORTED (N469AW) - [SDR AALA202211217175](https://openairdocs.org/sdr/AALA202211217175), Nov 18, 2022: DISPLAY, FAULTY (N832NN) --- From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.