Discussion
Consider the following statements about the system's outputs:
1. It provides pitch, roll and heading.
2. It does not provide position.
3. It replaces the air data computer.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statement 1 is correct: pitch, roll and heading are exactly the outputs the system exists to provide. Statement 2 is correct: it does not provide position, because that would require integrating specific force twice, with the error growing as \( t^2 \) and nothing available to bound it.
Statement 3 is false. The air data computer supplies altitude, airspeed and Mach number from pressure and temperature measurements - aerodynamic quantities that no inertial sensor measures. The two systems are complementary, and both are fitted.
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