1-56. Which statement describes the corrections 

 that must be made to aneroid and mercurial 

 barometers? 



1. Mercurial barometers require no cor- 

 rections for temperature or effect of 

 gravity, but aneroid barometers 

 require correction for the effect of 

 gravity 



2. Aneroid barometers require tempera- 

 ture correction only, but mercurial 

 barometers require corrections for 

 temperature and effect of gravity 



3. Mercurial barometers require correc- 

 tion for the effect of gravity only, 

 but aneroid barometers require no 

 corrections for temperature or the 

 effect of gravity 



4. Aneroid barometers require no correc- 

 tions for temperature or effect of 

 gravity, but mercurial barometers 

 require temperature correction 



1-57. The screw located at the base of the 

 Sylphon cell of a precision aneroid 

 barometer is used to 



1. make corrections for gravity 



2. make corrections for temperature 



3. adjust the range of the barometer 



4. adjust the barometer to the correct 

 readings 



1-58. What are the sequential procedures fol- 

 lowed when a precision aneroid barometer 

 is adjusted to a zero correction? 



1. Take a series of comparative readings 

 between the mercurial and aneroid 

 barometers, log the difference and 

 compute the algebraic difference; and 

 adjust the instrument by removing one- 

 half of this value in a series of 

 adjustments until a zero correction is 

 attained 



2. Take a series of comparative readings 

 between the mercurial and aneroid 

 barometers, log the differences and 

 compute the algebraic difference; and 

 adjust the instrument to an apparent 

 zero correction using the algebraic 

 difference. Repeat these steps until 

 a zero correction is attained 



3. Adjust the instrument by removing one- 

 half of the apparent error, remove the 

 linkage lag by tapping the case, and 

 determine the remaining error from a 

 comparative mercurial barometer read- 

 ing. Repeat these steps until a cor- 

 rection of zero is attained 



4. Adjust the instrument to an apparent 

 zero correction, remove the linkage 

 lag by tapping the case, and determine 

 the remaining error from a comparative 

 mercurial barometer reading. Repeat 

 these steps until a correction of zero 

 is attained 



1-59. When, if ever, should the aneroid barometer 

 (ML-448/UM) be lubricated? 



1 . Never 



2. Quarterly 



3. Semiannually 



4. Annually 



Learning Objective: Relative to 

 altimeters, recognize types, uses, 

 and operational characteristics 

 and procedures. 



1-60. Which of the following is NOT a basic type 

 of altimeter in general use today? 



1. Barometric pressure transducer 



2 . Radar 



3. Radio 



4. Pressure 



1-61. Refer to figure 2-9 in your text. If the 

 pressure at New Orleans was 1029 mb vice 

 1009 mb what would be your actual altitude 

 and indicated altitude assuming NO change 

 in altimeter setting? 



1. Actual altitude would be 800 feet and 

 indicated altitude 500 feet 



2. Actual altitude would be 500 feet and 

 indicated altitude 800 feet 



3. Actual altitude would be 500 feet and 

 indicated altitude 500 feet 



4. Actual altitude would be 1,000 feet 

 and indicated altitude 800 feet 



1-62. Which of the following statements compar- 

 ing flight level with true altitude is 

 correct? 



1. A flight level would be lower than the 

 true altitude when the air temperature 

 is above standard air temperature 



2. A flight level would be higher than 

 the true altitude when the air temp- 

 erature is less than the standard air 

 temperature 



3. A flight level and the true altitude 

 would correspond only when standard 

 atmosphere conditions are present 



4. A flight level would never be the same 

 as true altitude 



1-63. Radio altimeters operate better over water 

 than they do over land because the water 



1. area is flatter than land 



2. conducts sound better than land 



3. reflects sound better than land 



4. scatters sound better than land 



Learning Objective: Recognize pres- 

 sure computers, their operation, and 

 maintenance requirements. 



