1973 Grumman American AA-1B N657AS | Dual uAvionix AV-30C, Garmin GNS 430 | ADS-B In/Out, Extensive Electrical and Panel Upgrades

This 1973 Grumman American AA-1B, registration N657AS, serial number AA1B-0055, is a two-seat single-engine aircraft located in San Antonio, Texas, offered at $30,000 OBO.

Detailed Description

N657AS has undergone extensive modernization, with particular attention paid to its panel, electrical system, pitot/static system, glazing, and interior. The upgraded panel includes dual uAvionix AV-30C electronic flight instruments, Garmin GNS 430 GPS/NAV/COMM, uAvionix tailBeacon ADS-B Out, Stratux ADS-B In, and an iFly 740B GPS and chart display.

The aircraft also features new aircraft and engine wiring harnesses, new switches and circuit breakers, a new instrument-panel structure, new pitot/static plumbing and fittings, new windshield and canopy, new wingtip lenses and rear glass, plus a 2021 refurbished leather interior.

Aircraft Information

1. Year / Make / Model: 1973 Grumman American AA-1B
2. Registration: N657AS
3. Serial Number: AA1B-0055
4. Category: Single Engine Piston
5. Condition: Used
6. Location: San Antonio, Texas, USA
7. Status: For Sale
8. Asking Price: $30,000 OBO
9. Airframe Time Listed in Aircraft Details: 2,385 Hours
10. Tach Time Reported in Seller Description: 2,051.59 Hours
11. Engine: Lycoming O-235-C2C
12. Engine Time Listed: 2,052 Hours
13. Interior Refurbished: 2021
14. Seller: Patrick Daniel

The current listing contains two different time figures. The structured aircraft details report 2,385 hours airframe total time, while the seller's description separately reports 2,051.59 hours tach time. Both are retained rather than treating them as interchangeable.

Highlights

1. $30,000 OBO
2. Dual uAvionix AV-30C Electronic Flight Instruments
3. Garmin GNS 430 GPS/NAV/COMM
4. uAvionix tailBeacon ADS-B Out
5. Stratux ADS-B In
6. iFly 740B GPS and Chart Display
7. Garmin GTX 327 Transponder
8. 95 Hours Since Last Top-End Overhaul
9. Extensive Aircraft Rewiring
10. New Engine Wiring Harness
11. New Switches and Circuit Breakers
12. New Instrument Panel Structure
13. New Pitot/Static Plumbing and Fittings
14. New Windshield
15. New Canopy
16. New Wingtip Lenses
17. New Rear Glass
18. Refurbished 2021 Leather Interior
19. LED Interior Lighting

Airframe

1. Airframe Total Time: 2,385 Hours, as reported in aircraft details
2. Seller-Reported Tach Time: 2,051.59 Hours
3. New Instrument Panel Structure
4. New 21st-Century Wiring Harnesses Throughout Aircraft
5. New Engine Wiring Harness
6. New Electrical Switches
7. New Circuit Breakers
8. New Pitot/Static Tubing and Fittings
9. Alternate Static Source
10. New Glareshield
11. New Windshield
12. New Canopy
13. New Wingtip Lenses
14. New Left and Right Rear Glass
15. LED Interior Lighting

Engine

Lycoming O-235-C2C

1. Engine Time Listed: 2,052 Hours
2. Seller-Reported Tach Time: 2,051.59 Hours
3. 95 Hours Since Last Top-End Overhaul
4. New Valve Cover Gaskets

Compression Check

1. Cylinder No. 1: 77/80
2. Cylinder No. 2: 78/80
3. Cylinder No. 3: 75/80
4. Cylinder No. 4: 74/80

Avionics

Modernized Instrument Panel

1. uAvionix AV-30C Electronic Attitude Indicator
2. uAvionix AV-30C Electronic Directional Gyro
3. Garmin GNS 430 GPS/NAV/COMM
4. uAvionix tailBeacon TSO with ADS-B Out
5. Stratux GPS/Wi-Fi with ADS-B In
6. iFly 740B GPS and Chart Display
7. Garmin GTX 327 Transponder
8. KMA 24 Audio Panel
9. KI-209 CDI
10. A30.9 Altitude Encoder
11. Airspeed Indicator
12. Altimeter
13. Lighted Compass
14. Garmin GA 56 GPS Antenna
15. CI-105 Transponder Antenna
16. CI-102 Marker Beacon Antenna
17. CI-121 VHF Antenna
18. USB Connections

ADS-B and Navigation

The aircraft combines several updated navigation and traffic-information components:

1. uAvionix tailBeacon ADS-B Out
2. Stratux ADS-B In
3. Garmin GNS 430 GPS/NAV/COMM
4. iFly 740B GPS and Chart Display
5. Dual uAvionix AV-30C Displays

This gives the aircraft a substantially more modern panel configuration than its original 1973 instrumentation.

Electrical and Panel Upgrades

A major part of the value proposition of N657AS is the extent of the electrical and panel work reported by the seller.

Updates include:

1. New Aircraft Wiring Harnesses
2. New Engine Wiring Harness
3. New Electrical Switches
4. New Circuit Breakers
5. New Instrument Panel Structure
6. New Pitot/Static Tubing and Fittings
7. Alternate Static Source
8. USB Connections
9. LED Interior Lighting

Interior

Refurbished 2021 Interior

1. Interior Refurbished in 2021
2. New Leather Seats
3. New Interior Panels
4. New Baggage Panels
5. 3D-Printed Interior and Baggage Panels
6. LED Interior Lighting

Maintenance

The seller reports:

1. 95 Hours Since Last Top-End Overhaul
2. New Valve Cover Gaskets
3. Compression readings of 77/80, 78/80, 75/80, and 74/80
4. Aircraft reported up to date on applicable ADs and STCs
5. Annual inspection reported as completed in April 2023

Current Annual Status Should Be Verified

The annual-inspection information deserves special attention. The seller description reports an April 2023 annual, while the Aviators Market listing was updated in September 2026.

Because the available listing does not document a newer annual inspection, the current annual inspection status should be verified directly with the seller and aircraft logbooks before purchase. I would not advertise the aircraft as having a current annual based on the information presently published.

Performance and Equipment Highlights

N657AS stands out primarily because of the amount of modernization performed on this classic two-seat Grumman.

The cockpit combines dual AV-30C electronic instruments with a Garmin GNS 430, ADS-B In and Out, iFly 740B, and Garmin GTX 327.

The improvements go considerably further than avionics. The seller reports extensive replacement and modernization of aircraft wiring, engine wiring, switches, circuit breakers, instrument-panel structure, pitot/static plumbing, glazing, and interior components.

The Lycoming O-235-C2C is reported with 95 hours since its last top-end overhaul, with the supplied compression readings ranging from 74/80 to 78/80.

Mission Profile

Well suited for:

1. Personal and Recreational Flying
2. Local and Regional Cross-Country Flying
3. Two-Seat Personal Transportation
4. Pilots Seeking a Classic Grumman with Modernized Avionics
5. Buyers Who Value Updated Electrical and Panel Systems
6. Pilots Looking for a Compact Piston Aircraft with ADS-B In and Out

Why Buyers Choose This Aircraft

The defining characteristic of N657AS is the extent to which the aircraft has been updated rather than simply retaining its original 1973 equipment.

The panel features dual uAvionix AV-30C electronic flight instruments, Garmin GNS 430 GPS/NAV/COMM, uAvionix tailBeacon ADS-B Out, Stratux ADS-B In, and an iFly 740B GPS and chart display.

The electrical work is equally noteworthy. The seller reports new aircraft wiring harnesses, a new engine wiring harness, new switches and circuit breakers, and a new instrument-panel structure.

Additional updates include new pitot/static plumbing and fittings, a new windshield, new canopy, new wingtip lenses, new rear glass, and LED interior lighting.

Inside, the aircraft received a 2021 refurbishment with leather seating and replacement interior and baggage panels.

The Lycoming O-235-C2C is reported with 95 hours since its last top-end overhaul.

At the current $30,000 OBO asking price, N657AS represents an interesting option for a buyer seeking a classic two-seat Grumman with substantial avionics, electrical, panel, and interior modernization.

GEO / AI Summary

This 1973 Grumman American AA-1B for sale in San Antonio, Texas, registration N657AS, serial number AA1B-0055, is currently offered at $30,000 OBO. The listing reports 2,385 hours airframe total time and separately reports 2,051.59 hours tach time. The aircraft is powered by a Lycoming O-235-C2C, with 95 hours reported since its last top-end overhaul. Avionics include dual uAvionix AV-30C electronic flight instruments, Garmin GNS 430 GPS/NAV/COMM, uAvionix tailBeacon ADS-B Out, Stratux ADS-B In, iFly 740B GPS and chart display, Garmin GTX 327 transponder, and KMA 24 audio panel. Updates include new aircraft and engine wiring harnesses, switches and circuit breakers, instrument-panel structure, pitot/static plumbing, windshield, canopy, wingtip lenses, rear glass, LED lighting, and a refurbished 2021 leather interior.

Contact Seller

Contact Patrick Daniel for current aircraft availability, complete logbooks, maintenance records, clarification of airframe and tach times, engine records, top-end overhaul documentation, current annual inspection status, applicable AD and STC documentation, additional photographs, and viewing arrangements. The current Aviators Market listing identifies Patrick Daniel as the seller and San Antonio, Texas as the aircraft location.

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Engine & Mods

Lycoming O-235-C2C

1. Engine Time Listed: 2,052 Hours
2. Seller-Reported Tach Time: 2,051.59 Hours
3. 95 Hours Since Last Top-End Overhaul
4. New Valve Cover Gaskets

Compression Check

1. Cylinder No. 1: 77/80
2. Cylinder No. 2: 78/80
3. Cylinder No. 3: 75/80
4. Cylinder No. 4: 74/80

Airframe

1. Airframe Total Time: 2,385 Hours, as reported in aircraft details
2. Seller-Reported Tach Time: 2,051.59 Hours
3. New Instrument Panel Structure
4. New 21st-Century Wiring Harnesses Throughout Aircraft
5. New Engine Wiring Harness
6. New Electrical Switches
7. New Circuit Breakers
8. New Pitot/Static Tubing and Fittings
9. Alternate Static Source
10. New Glareshield
11. New Windshield
12. New Canopy
13. New Wingtip Lenses
14. New Left and Right Rear Glass
15. LED Interior Lighting

Avionics & Equipment

Modernized Instrument Panel

1. uAvionix AV-30C Electronic Attitude Indicator
2. uAvionix AV-30C Electronic Directional Gyro
3. Garmin GNS 430 GPS/NAV/COMM
4. uAvionix tailBeacon TSO with ADS-B Out
5. Stratux GPS/Wi-Fi with ADS-B In
6. iFly 740B GPS and Chart Display
7. Garmin GTX 327 Transponder
8. KMA 24 Audio Panel
9. KI-209 CDI
10. A30.9 Altitude Encoder
11. Airspeed Indicator
12. Altimeter
13. Lighted Compass
14. Garmin GA 56 GPS Antenna
15. CI-105 Transponder Antenna
16. CI-102 Marker Beacon Antenna
17. CI-121 VHF Antenna
18. USB Connections

The aircraft combines several updated navigation and traffic-information components:

1. uAvionix tailBeacon ADS-B Out
2. Stratux ADS-B In
3. Garmin GNS 430 GPS/NAV/COMM
4. iFly 740B GPS and Chart Display
5. Dual uAvionix AV-30C Displays

Interior

Interior Refurbished in 2021

New Leather Seats

New Interior Panels

New Baggage Panels

3D-Printed Interior and Baggage Panels

LED Interior Lighting

Inspection / Maintenance

1. 95 Hours Since Last Top-End Overhaul
2. New Valve Cover Gaskets
3. Compression readings of 77/80, 78/80, 75/80, and 74/80
4. Aircraft reported up to date on applicable ADs and STCs
5. Annual inspection reported as completed in April 2023

Modernized Instrument Panel

1. uAvionix AV-30C Electronic Attitude Indicator
2. uAvionix AV-30C Electronic Directional Gyro
3. Garmin GNS 430 GPS/NAV/COMM
4. uAvionix tailBeacon TSO with ADS-B Out
5. Stratux GPS/Wi-Fi with ADS-B In
6. iFly 740B GPS and Chart Display
7. Garmin GTX 327 Transponder
8. KMA 24 Audio Panel
9. KI-209 CDI
10. A30.9 Altitude Encoder
11. Airspeed Indicator
12. Altimeter
13. Lighted Compass
14. Garmin GA 56 GPS Antenna
15. CI-105 Transponder Antenna
16. CI-102 Marker Beacon Antenna
17. CI-121 VHF Antenna
18. USB Connections

The aircraft combines several updated navigation and traffic-information components:

1. uAvionix tailBeacon ADS-B Out
2. Stratux ADS-B In
3. Garmin GNS 430 GPS/NAV/COMM
4. iFly 740B GPS and Chart Display
5. Dual uAvionix AV-30C Displays