Mid-Continent HSI Control Switch PN MD189-1 SN M20416 N1850R

 – Tested Serviceable w Yellow Tag

HSI Heading / Course Control Knob • Certified Tested • Mid-Continent Avionics

• Brand: Mid-Continent Instruments & Avionics
• Manufacturer Part Number: MD189-1
• Serial Number: M20416
• Compatible Aircraft Make: Various (Cessna, Piper, Beech, etc.)
• Condition: Used – Certified Working / Tested
• Certification: Tested / Serviceable
• Type: HSI Control Switch / Heading Bug Knob

Genuine Mid-Continent Instruments HSI (Horizontal Situation Indicator) control switch / heading bug knob assembly. This is the primary pilot interface for setting course and heading on many legacy HSI systems.

Key Details

• Exact P/N: MD189-1
• Serial Number: M20416
• Function: Heading/course selector knob & switch assembly
• Compatible with numerous Mid-Continent / RCA / BendixKing HSIs
• Clean contacts, smooth rotation, positive detents

Condition & Certification

• Removed in working condition
• tested – switch functions correctly, knob turns freely with audible clicks
• No binding, no intermittent contacts
• Minor cosmetic wear (typical for avionics)
• Certified serviceable by avionics shop – ready to install

Fits These Systems / Aircraft (common applications)

• Mid-Continent KI-525 / KI-229 style HSIs
• Cessna 172RG / 182 / 206 / 210 / 310 / 421 series
• Piper PA-28R / PA-32R / PA-34 / PA-31
• Beech Bonanza / Baron / Duke (with Mid-Continent HSI upgrades)
• Many experimental / homebuilt panels

Why This One?

• Verified MD189-1 with serial number traceability
• Certified tested working – not just “as removed”
• Complete unit – no missing parts or damage
• Perfect for panel restoration, annual, or spare

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