Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p222
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 634938–637865

6A001.a. for acoustic systems, and 6A001.b. for correlation‑velocity and Doppler‑velocity sonar log equipment. See 8A002 for other marine systems.
7. A. 101. Linear accelerometers, other than those specified by 7A001, designed for use in inertial navigation systems or in guidance systems of all types, usable in 'missiles', having all the following characteristics, and specially designed components therefor:
a. A "bias" "repeatability" of less (better) than 1250 micro g; and
b. A "scale factor" "repeatability" of less (better) than 1250 ppm;
Note: 7A101 does not specify accelerometers which are specially designed and developed as MWD (Measurement While Drilling) Sensors for use in downhole well service operations.
Technical Notes:
1. In 7A101 'missile' means complete rocket systems and unmanned aerial vehicle systems capable of a range exceeding 300 km;
2. In 7A101 the measurement of "bias" and "scale factor" refers to a one sigma standard deviation with respect to a fixed calibration over a period of one year;
7. A. 102. All types of gyros, other than those specified by 7A002, usable in 'missiles', with a rated 'drift rate' 'stability' of less than 0.5° (1 sigma or rms) per hour in a 1 g environment and specially designed components therefor.
Technical Notes:
1. In 7A102 'missile' means complete rocket systems and unmanned aerial vehicle systems capable of a range exceeding 300 km.
2. In 7A102 'stability' is defined as a measure of the ability of a specific mechanism or performance coefficient to remain invariant when continuously exposed to a fixed operating condition (IEEE STD 528‑2001 paragraph 2.247).
3. In 7A102 'drift rate' is defined as the component of gyro output that is functionally independent of input rotation and is expressed as an angular rate. (IEEE STD 528‑2001 paragraph 2.56).
7. A. 103. Instrumentation, navigation equipment and systems, other than those specified by 7A003, as follows; and specially designed components therefor:
a. 'Inertial measurement equipment or systems', using accelerometers or gyros as follows:
1. Accelerometers specified by 7A001.a.3., 7A001.b. or 7A101 or gyros specified by 7A002 or 7A102;
2. Accelerometers specified by 7A001.a.1. or 7A001.a.2. and having all of the following:
a. Designed for use in inertial navigation systems or in guidance systems of all types and usable in 'missiles';
b. A "bias" "repeatability" of less (better) than 1250 micro g; and
7. A. 103. a. 2. c. A "scale factor" "repeatability" of less (better) than 1250 ppm;
Note 1: 7A103.a includes:
a. Attitude and Heading Reference Systems (AHRSs);
b. Gyrocompasses;
c. Inertial Measurement Units (IMUs);
d. Inertial Navigation Systems (INSs);
e. Inertial Reference Systems (IRSs);
f. Inertial Reference Units (IRUs).
Note 2: 7A103.a does not specify equipment containing accelerometers specified by 7A001 where such accelerometers are specially designed and developed as MWD