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COLONIAL AIRLINES, INC.

APRIL 8, 1947

TO:  Captains and first officers
FROM:  Director of flight operations
SUBJECT:  Range Data

The following data is for your information:

1. LaGuardia Instrument Landing System. Locator and Glide Path flight checked 1330E on April 4th and operation normal.

2. On or about April 9th, weather permitting, 75 mcs middle marker identification will be changed from six dots per second to alternate and dashes. The 75 mcs boundary marker unkeyed identification will be changed to six dots per second. 

3. Maspeth Compass Locator 317 kcs identification changed to letter "L".

4. Philadelphia Northeast Tower. Effective 0001E April 1st, Philadelphia Northeast Tower frequency changed to 212 kc.

5. Baltimore Radio. Radio range 257 kcs and voice communications on range frequency resumed operation 1325E April 3rd. Also on or about April 4th the range (loop radiators) power more than 50 less than 150 watts radio range will be changed to simultaneous operation. Concurrently the north course will be realigned three degrees clockwise to bearing 195 degrees toward station. Other courses remain unchanged. Frequency 257 kcs. Identification BO. Class SBMRLZ-DT.

6. Elmira Radio. Range flight checked. Courses as described in Albany sectional aeronautical chart dated 1-7-47. Multiples present all courses. 

Carl W. Rach

CWR:gmo