A320 pilot reported that the cockpit window shattered after the gate agent tapped on it.

Attributes
ACN	1642309
Time
Date	201905
Local Time Of Day	0601-1200
Place
Locale Reference	PHX.Airport
State Reference	AZ
Environment
Light	Daylight
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Cockpit Window
Person 1
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Ground Event / Encounter Other / Unknown

Narrative:

After the doors were closed; I am just prior to engine start at the gate. The gate agent trying to get my attention by knocking on the rear captain's side window. He knocked no more than three times and the window shattered. I believe he did nothing wrong as many gate agents do this when they try to get your attention obviously was a defect in the window.

Original NASA ASRS Text

Title: A320 pilot reported that the Cockpit window shattered after the Gate Agent tapped on it.

Narrative: After the doors were closed; I am just prior to engine start at the gate. The Gate Agent trying to get my attention by knocking on the rear Captain's side window. He knocked no more than three times and the window shattered. I believe he did nothing wrong as many gate agents do this when they try to get your attention obviously was a defect in the window.

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.