Narrative:

I was flying a helicopter from a field site 30 mi east of montpelier, vt, to a field site in attleboro, ma (137 NM). A straight line course would take us about 10 mi west of hanscom field in bedford, ma. We knew the WX was ok at our destination when we departed. As the flight progressed, we encountered headwinds, which put us closer to dusk, and the WX deteriorated. When we were about 25 mi from our destination, we used the search mode on our LORAN to find a place to land. The name 'bed' came up 7.2 mi and a heading of 32 degree. We decided to go there. At this point, my copilot could not find a tower frequency on the chart, as none was printed on it. He then found one in the flight guide under north bedford. We called on 118.1 and got no answer. So, we flew to the airport thinking it was an uncontrolled airport or the tower was closed. Upon our arrival at the airport, I flashed my landing light at the tower and got no response. We then landed on the ramp. I then tried the 2 popular ground frequencys and got an answer on 121.7. We were then informed that we had entered an IFR control zone west/O permission. We had landed at hanscom field, bedford, ma. I feel that the tower frequency should have been on the chart, as we were led to believe this airport had no tower. I also feel all lorans with a search mode should have the tower frequency displayed when they come up. The chart was the ny second 37TH edition, june 2, 1988, exp dec 15, 1988.

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Original NASA ASRS Text

Title: GA LTT HELICOPTER UNAUTH PENETRATION OF AIRSPACE. ATA CTZ AND UNAUTH LNDG.

Narrative: I WAS FLYING A HELI FROM A FIELD SITE 30 MI E OF MONTPELIER, VT, TO A FIELD SITE IN ATTLEBORO, MA (137 NM). A STRAIGHT LINE COURSE WOULD TAKE US ABOUT 10 MI W OF HANSCOM FIELD IN BEDFORD, MA. WE KNEW THE WX WAS OK AT OUR DEST WHEN WE DEPARTED. AS THE FLT PROGRESSED, WE ENCOUNTERED HEADWINDS, WHICH PUT US CLOSER TO DUSK, AND THE WX DETERIORATED. WHEN WE WERE ABOUT 25 MI FROM OUR DEST, WE USED THE SEARCH MODE ON OUR LORAN TO FIND A PLACE TO LAND. THE NAME 'BED' CAME UP 7.2 MI AND A HDG OF 32 DEG. WE DECIDED TO GO THERE. AT THIS POINT, MY COPLT COULD NOT FIND A TWR FREQ ON THE CHART, AS NONE WAS PRINTED ON IT. HE THEN FOUND ONE IN THE FLT GUIDE UNDER NORTH BEDFORD. WE CALLED ON 118.1 AND GOT NO ANSWER. SO, WE FLEW TO THE ARPT THINKING IT WAS AN UNCTLED ARPT OR THE TWR WAS CLOSED. UPON OUR ARR AT THE ARPT, I FLASHED MY LNDG LIGHT AT THE TWR AND GOT NO RESPONSE. WE THEN LANDED ON THE RAMP. I THEN TRIED THE 2 POPULAR GND FREQS AND GOT AN ANSWER ON 121.7. WE WERE THEN INFORMED THAT WE HAD ENTERED AN IFR CTL ZONE W/O PERMISSION. WE HAD LANDED AT HANSCOM FIELD, BEDFORD, MA. I FEEL THAT THE TWR FREQ SHOULD HAVE BEEN ON THE CHART, AS WE WERE LED TO BELIEVE THIS ARPT HAD NO TWR. I ALSO FEEL ALL LORANS WITH A SEARCH MODE SHOULD HAVE THE TWR FREQ DISPLAYED WHEN THEY COME UP. THE CHART WAS THE NY SEC 37TH EDITION, JUNE 2, 1988, EXP DEC 15, 1988.

Data retrieved from NASA's ASRS site as of August 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.