Alpi Aviation Alpi Pioneer 400 (ASO4)
ICAO ASO4 Light Piston

Alpi Aviation Alpi Pioneer 400

Single Piston

The Alpi Pioneer 400 is an Italian-designed two-seat light sport aircraft and ultralight kit plane manufactured by Alpi Aviation of Pordenone. First flown in the early 2000s, the Pioneer 400 represents a modern approach to affordable recreational aviation, combining composite construction with conventional high-wing configuration and tricycle landing gear. The aircraft is certified under European CS-VLA (Very Light Aircraft) standards and qualifies as a Special Light-Sport Aircraft in the United States, making it accessible to sport pilot certificate holders. Powered by a single Rotax 912-series engine producing 80-100 horsepower, the Pioneer 400 cruises at approximately 108 knots and offers a useful load around 485 pounds, suitable for two occupants and modest baggage on flights up to 500 nautical miles. Its composite airframe keeps empty weight near 650 pounds while providing a relatively spacious cabin for the ultralight category. The type appeals to owner-builders seeking a capable cross-country tourer that remains within light sport limitations, and its kit format allows builders to customize avionics and interior appointments. SkyMeter has tracked flights across airframes and operators, with distinct routes observed.

ACTIVE AIRFRAMES
last 7 days
🏢
OPERATORS
unique airlines
📊
FLIGHTS
tracked
AVG DURATION
per flight
INCIDENT RATE
0.0%
0 flagged

Safety in context

The incident rate counts flights with ANY safety event detected by SkyMeter — go-arounds (a routine response, not a failure), unstable-approach gate flags (advisory thresholds), rejected takeoffs (the system working as designed), and runway events. It is NOT an accident rate or fatality rate. For accident statistics, refer to the NTSB Aviation Accident Database (USA) or the Aviation Safety Network. See methodology for what each event type measures.

Performance

Speed envelope & approach

Vref
55 kt
Vref range
Vmo
Mmo
Vne
162 kt
Vno
135 kt
Vs0 (landing)
43 kt
Vfe
81 kt
Approach category

Dimensions

Airframe geometry

Wingspan
Length
Tail height
Wheelbase
Gear width
Wake category
L

Weight & identification

Operating limits

MTOW
1,433 lb
MALW
Manufacturer model
Alpi Pioneer 400
FAA designator
Registered

Top operators

By fleet size · last 7 days

0

No operator data available.

Safety profile

Flagged flights · last 7 days

No safety data available.

Family

Related variants

1

Recent flights

Real flights of ASO4 · airborne ≥ 20 min

16
06/04/2026
26m
No alerts
05/13/2026
26m
No alerts
04/27/2026
26m
No alerts
04/19/2026
30m
No alerts
04/19/2026
30m
No alerts
03/20/2026
26m
No alerts
03/12/2026
25m
No alerts
02/25/2026
29m
No alerts
02/18/2026
28m
No alerts
02/09/2026
29m
No alerts
01/26/2026
29m
No alerts
01/08/2026
30m
No alerts
01/02/2026
27m
No alerts
11/30/2025
25m
No alerts
11/11/2025
25m
No alerts
10/28/2025
28m
No alerts
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© SkyMeter · All flight data subject to ODbL attribution · Tracking window: 7 days (free tier)