Description / Abstract:
SCOPE:
This SAE Aerospace Information Report (AIR) is concerned only with
aspects directly relating to
available accuracy. While well-designed photoelectric, inductive or
capacitive readers and pressure
regulators, and other accessories are highly desirable for convenience
and production rate, they
are considered to be outside the scope of this AIR.
Purpose:
This AIR is intended to define three classes of barometers, working,
reference and transfer, and
some aspects of their use so that altimeters and air data transducers
calibrated against working
barometers will be comparable. An accuracy of ±0.003 inch (or
±0.076 mm) Hg should be
approachable with working barometers meeting the recommendations in
this AIR.
NOTE: 0.003 inch Hg corresponds to 3 ft of altitude at sea level and
11 ft of altitude at 40,000
feet. (0. 076 mm Hg corresponds to 0.8 m of altitude at sea level and
3.4 m of altitude at 12,000
meters.)