Narrative:

Captain and first officer misidented first aid kit for medical kit. On the aircraft there is 1 medical kit and 1 first aid kit. We are responsible for checking that seals are intact. The first officer duties require this on preflight. Apparently, there were 2 first aid kits, instead of 1 and 1. Maintenance caught this 2 days after my flight. Supplemental information from acn 465560: both kits are similar in size and color. The only difference is the labeling on the front of the kit.

Google
 

Original NASA ASRS Text

Title: A DHC8 FLC FAILS TO CATCH THE MAINT INDUCED ERROR IN THAT THE ACFT HAD 2 FIRST AID KITS ON BOARD VERSUS THE REQUIRED 1 FIRST AID KIT AND 1 MEDICAL KIT. ZZZ, US.

Narrative: CAPT AND FO MISIDENTED FIRST AID KIT FOR MEDICAL KIT. ON THE ACFT THERE IS 1 MEDICAL KIT AND 1 FIRST AID KIT. WE ARE RESPONSIBLE FOR CHKING THAT SEALS ARE INTACT. THE FO DUTIES REQUIRE THIS ON PREFLT. APPARENTLY, THERE WERE 2 FIRST AID KITS, INSTEAD OF 1 AND 1. MAINT CAUGHT THIS 2 DAYS AFTER MY FLT. SUPPLEMENTAL INFO FROM ACN 465560: BOTH KITS ARE SIMILAR IN SIZE AND COLOR. THE ONLY DIFFERENCE IS THE LABELING ON THE FRONT OF THE KIT.

Data retrieved from NASA's ASRS site as of July 2007 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.