B757 captain reported a rejected takeoff due to an access door EICAS alert.

Attributes
ACN	1580963
Time
Date	201809
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Door Warning System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

On takeoff at approximately 115mph; 'fwd access door' EICAS alert came on. Air conditioning cart was used in ZZZ. Forward access door was closed and light extinguished prior to engine start. After 80 knot call I was focused on engine instruments when alert came on. I elected to reject at that time. Proceeded back to the gate. Brake cooling chart applied. Micro switch malfunction or door wasn't fully secured.

Original NASA ASRS Text

Title: B757 Captain reported a rejected takeoff due to an access door EICAS alert.

Narrative: On takeoff at approximately 115mph; 'FWD Access door' EICAS alert came on. Air conditioning cart was used in ZZZ. Forward access door was closed and light extinguished prior to engine start. After 80 knot call I was focused on engine instruments when alert came on. I elected to reject at that time. Proceeded back to the gate. Brake cooling chart applied. Micro switch malfunction or door wasn't fully secured.

Data retrieved from NASA's ASRS site 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.