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022 Instrumentation

022 Instrumentation

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What is the minimum number of accelerometers required on an INS platform?

one

Three

Two

Four

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A Ring Laser Gyro (RLG) is a solid state gyro consisting of:

1. Glass block for the laser pathway

2. Rotary gimbal mounting

3. Anode and cathode for the laser

4. Stable platform mounting

2 and 4

1 and 3

2 and 3

1 and 4

An inertial navigation system:

can operate as stand alone equipment without any interface with other navigation equipment.

can only operate when interfacing with the GPS equipment

can only operate when interfacing with the radionavigation equipment.

can only operate when communicating with ground installations.

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If the navigation function of an INS is inoperative and the control rotary switch is set to ATT, the output data of the INS

is (are):

position and attitude.

❌

attitude and ground speed

attitude and heading

heading.

How can an INS/IRS be realigned in flight if alignment is lost for some reason?

By setting the INS mode selector to "ALIGN" and then flying straight and level with NO airspeed variations for

at least 10 minutes.

By setting the INS mode selector to "ALIGN" and waiting for the required time.

By setting the INS mode selector to "GPS" and realigning the INSARS through the GPS.

It can NOT, the aircraft must be stationary on the ground for alignment to be performed.

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Is there, by convention, a difference between an INS and an IRS?

Yes, the INS is an older system based on a stabilised platform and mechanical gyros, while the IRS is a more modern. fixed system based on ring laser gyros or fibre optic gyros.

✅

Yes, the IRS is an older system based on a stabilised platform and mechanical gyros, while the INS is a more modern, fixed system based on ring laser gyros or fibre optic gyros.

❌

Yes, the INS requires electrical power for its operation, while the IRS is completely independent of theelectrical power.

❌

Yes, the INS requires electrical power for its operation, while the IRS is completely independent of the electrical power.

❌

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The rigidity of a gyro is improved by:

decreasing RPM and concentrating the mass at the hub of the rotor.

❌

decreasing RPM and concentrating the mass on the periphery of the rotor.

❌

increasing RPM and concentrating the mass at the hub of the rotor.

❌

increasing RPM and concentrating the mass on the periphery of the rotor.

✅

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A pilot checks the position error of a stand-alone INS against a known position fix, having completed one hour of flying.

The error is approximately 2 NM. This error varies and depends on:

1. Gyro drift rate.

2. Wind drift.

3. Accelerometer bias.

4. Initial misalignment

5. Computational errors.

6. Pilot handling skills.

2,3, 4 and 6.

1, 2, 5 and 6.

1, 3, 4 and 5.

1, 2, 3 and 4.

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What does "apparent wander" refer to?

The movement of the gyro spin axis along the horizontal plane.

The wander caused by movement of the aircraft.

The movement of the gyroscopic position about the vertical axis as observed by a person standing on the

surface.

100%

The shift in position caused by imperfections in the design of a gyroscope.

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Which statement describes an occasion for carrying out a compass swing on a direct reading compass?

Before an aircraft goes on any flight that involves a large change of magnetic latitude.

Whenever an aircraft carries a large freight load regardless of its content.

After any of the aircraft radio equipment has been changed due to unserviceability.

After an aircraft has passed through a severe electrical storm or has been struck by lightning.

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