Narrative:

About 1/2 hour before my flight from hemet-ryan to ensenada, mexico, I obtained a telephone briefing. When discussing the NOTAMS, the briefer mentioned the air show at miramar with a flight restr below 16000 ft and within a 5 NM radius of the airport from 1500-2130 ft. He then said something to the effect of: 'disregard, it's already over.' this made sense to me since XA30Z is equivalent to XB30 local time (PDT), and briefing time was around XB50. Being a friday, it sounded like this was a morning practice session for the air show pilots for the air show on saturday and sunday. My plan had been to take a direct route from hemet to poggi (VOR) and get a class B clearance. Since I was unable to get the clearance when in the escondido area (I assumed that friday afternoon traffic was heavy, the frequency congestion bore this out). I diverted towards the coast to use the VFR corridor over lindbergh field. Although this was my first time flying in the area, I had studied the san diego tac the previous evening and felt comfortable with transitioning this airspace. I thought nothing more of this until I was asked by san diego brown field tower (who I had contacted prior to crossing the border), to call a certain phone number, 'ask for mr X or mr Y because of a possible 'scraping' of the temporary restr airspace at miramar.' although I made several attempts to contact mr X or mr Y at this number and others, I have been unsuccessful so far. Today, I got the idea that I was supposed to contact a mr xy so I will make another attempt on monday. My assumption is that the NOTAM time was given in local time, but without the 'lt' following the time indication and that the briefer assumed that this was a UTC time. I am very concerned about the safety issues associated with the use of both UTC and local time on NOTAMS without clear identify of which time is in use. I believe that the indicator 'Z' or 'lt' should be used for every time indication in a NOTAM. Fortunately, it does not appear that there was any kind of traffic conflict.

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Original NASA ASRS Text

Title: C172 PLT ENTERED NKX CLASS D WITHOUT CLRNC.

Narrative: ABOUT 1/2 HR BEFORE MY FLT FROM HEMET-RYAN TO ENSENADA, MEXICO, I OBTAINED A TELEPHONE BRIEFING. WHEN DISCUSSING THE NOTAMS, THE BRIEFER MENTIONED THE AIR SHOW AT MIRAMAR WITH A FLT RESTR BELOW 16000 FT AND WITHIN A 5 NM RADIUS OF THE ARPT FROM 1500-2130 FT. HE THEN SAID SOMETHING TO THE EFFECT OF: 'DISREGARD, IT'S ALREADY OVER.' THIS MADE SENSE TO ME SINCE XA30Z IS EQUIVALENT TO XB30 LCL TIME (PDT), AND BRIEFING TIME WAS AROUND XB50. BEING A FRIDAY, IT SOUNDED LIKE THIS WAS A MORNING PRACTICE SESSION FOR THE AIR SHOW PLTS FOR THE AIR SHOW ON SATURDAY AND SUNDAY. MY PLAN HAD BEEN TO TAKE A DIRECT RTE FROM HEMET TO POGGI (VOR) AND GET A CLASS B CLRNC. SINCE I WAS UNABLE TO GET THE CLRNC WHEN IN THE ESCONDIDO AREA (I ASSUMED THAT FRIDAY AFTERNOON TFC WAS HVY, THE FREQ CONGESTION BORE THIS OUT). I DIVERTED TOWARDS THE COAST TO USE THE VFR CORRIDOR OVER LINDBERGH FIELD. ALTHOUGH THIS WAS MY FIRST TIME FLYING IN THE AREA, I HAD STUDIED THE SAN DIEGO TAC THE PREVIOUS EVENING AND FELT COMFORTABLE WITH TRANSITIONING THIS AIRSPACE. I THOUGHT NOTHING MORE OF THIS UNTIL I WAS ASKED BY SAN DIEGO BROWN FIELD TWR (WHO I HAD CONTACTED PRIOR TO XING THE BORDER), TO CALL A CERTAIN PHONE NUMBER, 'ASK FOR MR X OR MR Y BECAUSE OF A POSSIBLE 'SCRAPING' OF THE TEMPORARY RESTR AIRSPACE AT MIRAMAR.' ALTHOUGH I MADE SEVERAL ATTEMPTS TO CONTACT MR X OR MR Y AT THIS NUMBER AND OTHERS, I HAVE BEEN UNSUCCESSFUL SO FAR. TODAY, I GOT THE IDEA THAT I WAS SUPPOSED TO CONTACT A MR XY SO I WILL MAKE ANOTHER ATTEMPT ON MONDAY. MY ASSUMPTION IS THAT THE NOTAM TIME WAS GIVEN IN LCL TIME, BUT WITHOUT THE 'LT' FOLLOWING THE TIME INDICATION AND THAT THE BRIEFER ASSUMED THAT THIS WAS A UTC TIME. I AM VERY CONCERNED ABOUT THE SAFETY ISSUES ASSOCIATED WITH THE USE OF BOTH UTC AND LCL TIME ON NOTAMS WITHOUT CLR IDENT OF WHICH TIME IS IN USE. I BELIEVE THAT THE INDICATOR 'Z' OR 'LT' SHOULD BE USED FOR EVERY TIME INDICATION IN A NOTAM. FORTUNATELY, IT DOES NOT APPEAR THAT THERE WAS ANY KIND OF TFC CONFLICT.

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.