How many Diamond DA 40s are registered in the US?

1,000, in the FAA aircraft registry.

When was the Diamond DA 40 built?

From about 2002 to 2025. Half of those registered today were built by 2008.

What engine does the Diamond DA 40 have?

Most have the Lycoming IO-360 (66% of those registered); others have the Austro Engine E4.

How many accidents has the Diamond DA 40 had?

53 in the NTSB's database since 2008, 9 of them fatal. The most common defining event was loss of control on ground. These are counts, not rates: how many hours the fleet flew is not published.

How many Airworthiness Directives does the Diamond DA 40 have?

13 current ADs name the DA 40 airframe, 5 of them with a repeat action, and 40 more name its engines. Whether each applies to one aircraft depends on its serial number and installed equipment.

Ownership guide

Diamond DA 40

1,000 registered in the US, built from about 2002 to 2025, 4 seats, most with the Lycoming IO-360. Its Airworthiness Directives, its engines', and what to check before buying one.

The fleet

Registered in the US: 1,000
Built: 2002 to 2025
Half built by: 2008
Seats: 4
Engine type: Piston
Most common engine: Lycoming IO-360

Engines installed

Lycoming IO-360655 aircraft (66%) · 29 ADs, 4 with a repeat action
Austro Engine E4294 aircraft (29%) · 11 ADs, 5 with a repeat action

From the FAA aircraft registry, rebuilt daily. Years are those recorded on each registration.

Airworthiness Directives

13 current ADs name the DA 40 airframe, 5 with a repeat action; 4 more were superseded. Its engines carry 40 more. 10 equipment ADs name the model.

The ones that come back

ADs with a repeat action: an inspection or replacement at an interval, for as long as the AD applies. These are the airworthiness costs an owner keeps paying.

Every AD for the Diamond DA 40

Accident record

53 accidents since 2008, 9 fatal (15 people killed in them, a midair counting both aircraft), 3 aircraft destroyed.

What happened

Loss of control on ground10
Hard landing6
Loss of control in flight5
Controlled flight into terrain or object (CFIT)5
Loss of engine power (partial)3
Loss of engine power (total)3

Phase of flight

Landing21
Enroute8
Initial climb5
Maneuvering5
Approach4

The latest

Date	Where	What happened	Injuries	NTSB number
2026-09-04	Leesburg, FL	Landing: Hard landing	None	ERA26LA330
2026-06-29	Petersburg, VA	Initial climb: Loss of engine power (partial)	Serious	ANC26LA066
2026-03-24	Galveston, TX	Standing: Ground collision	None	CEN26LA145B
2026-01-27	Bay minette, AL	Enroute: Loss of engine power (total)	Minor	ERA26LA098
2025-09-12	Rocky ridge, UT	Maneuvering: Miscellaneous/other	Minor	WPR25LA278
2025-05-07	Sanford, NC	Initial climb: Powerplant sys/comp failure	Serious	ERA25LA198

From the NTSB's aviation accident database, refreshed monthly; accidents only, homebuilts left out. Counts, not rates: nobody publishes how many hours each model flies, and a training fleet flies far more than a private one. Look up any case by its number in the NTSB's CAROL.

What it costs to run

Per hour flown

Hours flown a yearhr/yrFuel burngal/hrTypical cruise; your POH and how you fly decide it.Fuel price$/galEngine overhaul$A quote from an engine shop.Hours to overhaulhrThe engine maker's published time between overhauls.Maintenance reserve$/hrEverything else that wears: tires, brakes, avionics, the unexpected.

Per year, flown or not

Insurance$/yrHangar or tiedown$/yrAnnual inspection$/yrLoan payments$/yrEverything else$/yrSubscriptions, database updates, the property tax some states charge.

Fuel: $0/hr
Engine reserve: $0/hr
A year: $0
All in, per hour: $0/hr

Everything else is yours to fill in: insurance, hangar and overhaul prices vary too much by pilot, airport and shop for a default to mean anything. Nothing you type leaves this page.

Before you buy one

Run its N-number through the AD check: every AD that names its airframe and engine, as a checklist to take to the logbooks.
For each repeat-action AD (5 on the airframe), find the last compliance in the logbooks and when the next one is due.
Compare the engine's time since overhaul with its maker's published overhaul time, and look for the reason behind any long gap in flying.
10 equipment ADs name the DA 40 (a muffler, a seat belt, a display): find out which of that equipment is installed.
Check the registration, the airworthiness certificate and the date of the last annual inspection.
Work out the sales or use tax your state will charge with the aircraft tax calculator.

Questions

How many Diamond DA 40s are registered in the US?: 1,000, in the FAA aircraft registry.
When was the Diamond DA 40 built?: From about 2002 to 2025. Half of those registered today were built by 2008.
What engine does the Diamond DA 40 have?: Most have the Lycoming IO-360 (66% of those registered); others have the Austro Engine E4.
How many accidents has the Diamond DA 40 had?: 53 in the NTSB's database since 2008, 9 of them fatal. The most common defining event was loss of control on ground. These are counts, not rates: how many hours the fleet flew is not published.
How many Airworthiness Directives does the Diamond DA 40 have?: 13 current ADs name the DA 40 airframe, 5 of them with a repeat action, and 40 more name its engines. Whether each applies to one aircraft depends on its serial number and installed equipment.

Figures from the FAA aircraft registry and the FAA's Airworthiness Directives, rebuilt daily. An AD listed for a model is one to read; whether it applies to one aircraft depends on its serial number, equipment and records.