| Make | Sigma Tek |
|---|---|
| Model | Sigma-Tek IU445 HSI Directional Gyro |
| Condition | Used |
| Location | Goleta, CA , US |
| Date Listed | Aug 6, 2026 |
| Expires | Sep 5, 2026 |
Description
Sigma-Tek IU445 HSI Directional Gyro
PN 1U445-008-8 SN T1268
Used aircraft flight instrument.
Yellow-tagged / maintenance release included (see tag photo).
Tag indicates Removed Serviceable .
Cosmetic wear consistent with normal service.
Glass and bezel intact as shown.
Exact unit shown is the unit being sold.
Guaranteed Functional or Return – 30-Day Seller Warranty.
INCLUDED
HSI instrument shown
COMPATIBILITY
This Sigma-Tek HSI is used in conventional vacuum-driven HSI installations.
Manufacturers commonly equipped with Sigma-Tek HSI instruments:
Cessna
Beechcraft
Piper
Mooney
Models vary by aircraft configuration, system type, and IPC revision.
Installer must verify exact applicability using the aircraft IPC, approved data, and Sigma-Tek installation documentation.
SYSTEM NOTES
Vacuum-driven HSI / directional gyro assembly.
Designed for use with compatible NAV systems and resolver interfaces.
RETURNS
30-day returns accepted.
Seller pays return shipping.
IMPORTANT
Final installation approval and airworthiness determination are the responsibility of the installing A&P / IA.
Photos show the exact item you will receive.
NOTES
Sigma-Tek HSI, 1U445-008-8, aircraft HSI, horizontal situation indicator, vacuum gyro HSI, yellow tag avionics, general aviation instruments, Cessna HSI, Beechcraft HSI, Piper HSI
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