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CANADIAN COLONIAL AIRWAYS

March 25, 1942

TO:  FLIGHT SUPERINTENDENTS
CAPTAINS AND FIRST OFFICERS
SUPT. OF COMMUNICATIONS - NY
OFFICER IN CHARGE, DEPT. OF TRANSPORT RADIO STATION - UL
STATION MANAGERS - AZ AND JG

FROM:  VICE PRESIDENT

SUBJECT: ALTIMETER SETTINGS

Listed below are company altimeter settings for all stations. You are requested to use these figures for setting and checking altimeters:

[[6 columned table]]
|   | AIRPORT SEA LEVEL ELEVATION | STATION INSTRUMENT SEA LEVEL ELEVATION. SET STATION SEA LEVEL ALTIMETER TO THIS SETTING | STATION INSTRUMENT HEIGHT ABOVE OR BELOW INSTRUMENTS IN COCKPIT WITH AIRPLANE ON GROUND. SET STATION FIELD PRESSURE ALTIMETER TO THIS SETTING | PROPER READING OF COCKPIT SEA LEVEL ALTIMETER WITH AIRPLANE ON GROUND | PROPER DIFFERENCE BETWEEN THE TWO ALTIMETERS IN COCKPIT AT ALL TIMES |
| --- | --- | --- | --- | --- | --- |

| DORVAL | 95' | 118' | 11' above | 107' | 107' |
| BURLINGTON | 331' | 335' | 8' below | 343' | 343' | 
| ALBANY | 275' | 283' | 4' below | 287' | 287' |
| NEW YORK LA GUARDIA | 14' | 36' | 10' above | 26' | 26' |
[[end table]]

NOTE: 1. Sea level altimeter in cockpit is set to read the sea level elevation of the instrument, NOT the elevation of the landing gear wheels (12 ft. difference).

2. Field pressure instrument in cockpit should read zero when the airplane is on the ground.

3. Any altimeter which has an error of over 30 ft. should be reported on the Pilot's Maintenance Report.

DESTROY PREVIOUS ISSUE "ALTIMETER SETTINGS" DATED DECEMBER 2, 1941

Lowell S. Harding