Narrative:

I departed ZZZ while the airport was closed by a NOTAM. I self-briefed on duats earlier in the day; 3-4 hours prior to the flight. I overlooked the aerodrome NOTAM that indicated the airport was closed. Part of the reason that I did not find the NOTAM closing the airport is the new NOTAM format that has gone into effect since my last flight in january. I read a brief statement about the changes to the NOTAM formats in january but did not research the changes. After I departed the airport I was monitoring approach control and heard the controller advise another aircraft that the airport I just departed was closed by NOTAM. I called the controller and advised him that I had just departed the airport and that I would land at a nearby airport and phone the airport at ZZZ to determine the status of the airport. The airport manager informed me that the airport was notamed closed due to water on the runway 400-500 ft from the approach end of runway X. The flooded area is not visible from the other end of the runway where I started my departure roll and there were no markings on the runway indicating the closure. I was airborne and in a climb attitude prior to the point on the runway where the water would have been visible. I asked if I could return to the airport so that I could return the aircraft to the hangar. The airport manager told me that I could land at my own risk. I overflew the airport to visually inspect the unusable portion and determined that there was at least 2000 ft of usable runway when landing on runway Y. The available runway was more than sufficient for safely landing the PA28 I was flying; so I proceeded to land and park the aircraft. I will review the revised NOTAM terminology and acronyms so that I will not overlook any NOTAM in the future and will call the flight service WX brief number for a NOTAM check prior to flying in the future. I have gotten out of the habit of calling FSS due to long phone delays since the system was privatized. I hope that the call response time has improved.

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Original NASA ASRS Text

Title: PA28 PILOT REPORTS DEPARTING UNINTENTIONALLY FROM CLOSED RWY AFTER MISSING NOTAM DESCRIBING CLOSURE.

Narrative: I DEPARTED ZZZ WHILE THE ARPT WAS CLOSED BY A NOTAM. I SELF-BRIEFED ON DUATS EARLIER IN THE DAY; 3-4 HRS PRIOR TO THE FLT. I OVERLOOKED THE AERODROME NOTAM THAT INDICATED THE ARPT WAS CLOSED. PART OF THE REASON THAT I DID NOT FIND THE NOTAM CLOSING THE ARPT IS THE NEW NOTAM FORMAT THAT HAS GONE INTO EFFECT SINCE MY LAST FLT IN JANUARY. I READ A BRIEF STATEMENT ABOUT THE CHANGES TO THE NOTAM FORMATS IN JANUARY BUT DID NOT RESEARCH THE CHANGES. AFTER I DEPARTED THE ARPT I WAS MONITORING APCH CTL AND HEARD THE CTLR ADVISE ANOTHER ACFT THAT THE ARPT I JUST DEPARTED WAS CLOSED BY NOTAM. I CALLED THE CTLR AND ADVISED HIM THAT I HAD JUST DEPARTED THE ARPT AND THAT I WOULD LAND AT A NEARBY ARPT AND PHONE THE ARPT AT ZZZ TO DETERMINE THE STATUS OF THE ARPT. THE ARPT MGR INFORMED ME THAT THE ARPT WAS NOTAMED CLOSED DUE TO WATER ON THE RWY 400-500 FT FROM THE APCH END OF RWY X. THE FLOODED AREA IS NOT VISIBLE FROM THE OTHER END OF THE RWY WHERE I STARTED MY DEP ROLL AND THERE WERE NO MARKINGS ON THE RWY INDICATING THE CLOSURE. I WAS AIRBORNE AND IN A CLB ATTITUDE PRIOR TO THE POINT ON THE RWY WHERE THE WATER WOULD HAVE BEEN VISIBLE. I ASKED IF I COULD RETURN TO THE ARPT SO THAT I COULD RETURN THE ACFT TO THE HANGAR. THE ARPT MGR TOLD ME THAT I COULD LAND AT MY OWN RISK. I OVERFLEW THE ARPT TO VISUALLY INSPECT THE UNUSABLE PORTION AND DETERMINED THAT THERE WAS AT LEAST 2000 FT OF USABLE RWY WHEN LNDG ON RWY Y. THE AVAILABLE RWY WAS MORE THAN SUFFICIENT FOR SAFELY LNDG THE PA28 I WAS FLYING; SO I PROCEEDED TO LAND AND PARK THE ACFT. I WILL REVIEW THE REVISED NOTAM TERMINOLOGY AND ACRONYMS SO THAT I WILL NOT OVERLOOK ANY NOTAM IN THE FUTURE AND WILL CALL THE FLT SVC WX BRIEF NUMBER FOR A NOTAM CHK PRIOR TO FLYING IN THE FUTURE. I HAVE GOTTEN OUT OF THE HABIT OF CALLING FSS DUE TO LONG PHONE DELAYS SINCE THE SYS WAS PRIVATIZED. I HOPE THAT THE CALL RESPONSE TIME HAS IMPROVED.

Data retrieved from NASA's ASRS site as of May 2009 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.