Da-40 pilot reported the canopy departed the aircraft because it was improperly secured.

Attributes
ACN	1103894
Time
Date	201307
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Tower
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	DA40 Diamond Star
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Cockpit Canopy Window
Person 1
Function	Pilot Flying Instructor
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 490 Flight Crew Type 15
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

The rear canopy of the DA40 was not properly closed and locked prior to the flight. During takeoff roll the rear canopy came loose and departed the aircraft landing at the edge of the runway. The takeoff was safely aborted and the aircraft never left the ground. No injury to persons resulted.

Original NASA ASRS Text

Title: DA-40 pilot reported the canopy departed the aircraft because it was improperly secured.

Narrative: The rear canopy of the DA40 was not properly closed and locked prior to the flight. During takeoff roll the rear canopy came loose and departed the aircraft landing at the edge of the runway. The takeoff was safely aborted and the aircraft never left the ground. No injury to persons resulted.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.