ALTIMETER SCALE CORRECTION CARD 
Airplane No. 
1 Ills card will be placed in the airplane in a correction card holder, 
part AN5800, as near as practicable to the serially numbered altimeter 
to which these corrections apply. 
Altimeter corrections shown on this card must be added algebraically 
to indicated altitude to obtain the correct altitude. 
In determining corrections from card, select the correction by inter¬ 
polation corresponding to the existing INSTRUMENT temperature. 
Scale corrections shown on this card are the scale errors with the 
sign reversed. Only those scale errors determined by the use of an accu¬ 
rate mercurial barometer at the time the altimeter is calibrated for 
acceptance or after repair will be used in determining scale corrections 
for entry on this card. Scale errors determined by comparison with open 
manometer or master altimeter will not be used. The completed scale 
correction card will be attached to the altimeter when it is not installed 
in the airplane. 
Fart No. AN580I 
