Reporter mistakenly flies with lapsed medical.

Attributes
ACN	438770
Time
Date	199906
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 1400 flight time type : 50
ASRS Report	438770
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : far non adherence other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I had stuck in my head that a second class medical is good for 24 months. I don't know why I thought this. My mistake was discovered by my company a month after my medical changed to a third class. I'm on reserve for my company and I didn't fly very often, but I did fly during that month as a first officer. As soon as my company told me I ran out and got a first class medical. My company told me at XA00 and I had a first class medical done by XD00 that day. As soon as I realized my mistake, I corrected it as soon as possible. I wish this wouldn't have happened. I don't know what I was thinking. I am back on line with an updated first class medical. I've learned from this mistake and it won't happen ever again.

Original NASA ASRS Text

Title: RPTR MISTAKENLY FLIES WITH LAPSED MEDICAL.

Narrative: I HAD STUCK IN MY HEAD THAT A SECOND CLASS MEDICAL IS GOOD FOR 24 MONTHS. I DON'T KNOW WHY I THOUGHT THIS. MY MISTAKE WAS DISCOVERED BY MY COMPANY A MONTH AFTER MY MEDICAL CHANGED TO A THIRD CLASS. I'M ON RESERVE FOR MY COMPANY AND I DIDN'T FLY VERY OFTEN, BUT I DID FLY DURING THAT MONTH AS A FO. AS SOON AS MY COMPANY TOLD ME I RAN OUT AND GOT A FIRST CLASS MEDICAL. MY COMPANY TOLD ME AT XA00 AND I HAD A FIRST CLASS MEDICAL DONE BY XD00 THAT DAY. AS SOON AS I REALIZED MY MISTAKE, I CORRECTED IT ASAP. I WISH THIS WOULDN'T HAVE HAPPENED. I DON'T KNOW WHAT I WAS THINKING. I AM BACK ON LINE WITH AN UPDATED FIRST CLASS MEDICAL. I'VE LEARNED FROM THIS MISTAKE AND IT WON'T HAPPEN EVER AGAIN.

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.