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1973 Commander 500 SMulti-Engine Piston Aircraft • Tucson, AZ, USA

This 1973 Aero Commander 500 S, registration N500HM, is a Shrike featuring the desirable Merlyn (MPi) 350 HP conversion under STC SA5969NM. The conversion swaps in twin Lycoming TIO-540-J2B(D) engines, each delivering 350 horsepower with a 2,000-hour TBO, and allows for a max gross takeoff weight of 8,800 lbs and total fuel capacity of 244 gallons. The airframe has 6,223 total hours, with the left engine at 1,369 hours SMOH and the right at 1,383 hours SMOH; the right propeller was IRAN'd at the current annual, and the right engine has a newly overhauled fuel servo and mechanical fuel pump, along with a turbocharger replaced about 150 hours...

Year
1973
Make
Commander
Series
500
Model
500 S
Tail #
N500HM
Serial #
3155

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Specifications

Category
Multi-Engine Piston
Intended Use
Business, Aerial Surveying, Utility
Flight Rules
IFR
Useful Load
3,222 lbs

Hours, Logs & Inspections

Total Time
6,223 hrs
Engine 1 Time
1,369 hrs (SMOH)
Engine 2 Time
1,385 hrs (SMOH)
Prop 1 Time
1,369 hrs (SMOH)
Prop 2 Time
1,385 hrs (SMOH)
Inspection Status
Currently in Annual Inspection; Completion Expected July 2026

Avionics

GPS

Garmin GNS 430W - GNS (WAAS GPS/NAV/COM)

Comms

Garmin GTR 205 - COM Radio

Audio

Garmin GMA 340 - GMA Audio Panel

ADSB

Garmin GTX 345 - GTX Transponder ADS-B Out

ADS-B In

Garmin GTX 345 - GTX Transponder ADS-B Out

EMS

Insight G4 - Twin-Engine Graphic Monitor

Additional Equipment

Fuel Flow Totalizer

Shadin Digital Fuel Flow/Totalizer; Digital RPM Gauges

Oxygen System

New Oxygen Bottle Installed, but a leak must be located before O2 use

Air Conditioning

Air Conditioning Installed but has a refrigerant leak - currently used as a strong cabin fan, not for cooling

De-ice Boots

Wing/Empennage De-ice Boots Installed but Inoperative

Survey Camera Hatch

Survey Camera Bay: ~25 x 22 in. D-shaped opening, right side of fuselage aft of the copilot; closable by design - Aerial Survey Camera Hatch / Camera Hole STC for special mission and mapping

Engine & Propeller

Engine Type
Piston
Engine Count
2
Engine Make
Lycoming
Engine Model
TIO-540-J2B(D)
Engine Power
350 HP

Asking Price

$330,000

Aircraft Location

Tucson, AZ, USA

Listing Details

Used
For Sale

Price History

Jul 1, 2026: $330,000(+$5,000) - trade-a-plane

Jul 1, 2025: $325,000 - trade-a-plane

Contact Seller

First Seen: Jul 1, 2025

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Asking Price

$330,000