Ignition Systems & Launch Controllers Flashcards

What does the 'arm' switch on a launch controller do in the ignition sequence?

Answer: It enables the high-current firing circuit so the launch button can complete ignition

The arm switch enables the firing circuit, making the system live so that pressing the launch button can complete the circuit and deliver current to the igniter.

What should be done with the launch controller leads during the mandatory wait period following a misfire?

Answer: Leave them connected while all personnel remain at the required safe distance

During the mandatory 60-second wait, leads remain connected and all personnel stay at safe distance; no approach or changes to the system are permitted until the wait elapses.

What is the purpose of a nozzle plug used with high-power rocketry motors?

Answer: To protect the propellant grain from moisture and debris until the igniter is installed

Nozzle plugs protect the propellant grain from moisture and contamination during storage and transport; they are removed when the igniter is installed at the pad.

At what stage of launch preparation should the launch controller leads be physically connected to the igniter?

Answer: At the pad, as the final step immediately before the RSO arms the system

Connecting launch leads is the final preparation step before arming, minimizing the time the igniter is wired to the firing circuit and reducing risk.

Why is it important to verify that no RF transmitters are active near a rocket on the launch pad?

Answer: RF energy can induce current in igniter leads and potentially cause inadvertent ignition

RF energy from nearby radios or transmitters can induce electrical current in igniter lead wires, potentially triggering inadvertent ignition of the motor.

What type of launch controller capability is required when igniting a cluster of two or more motors simultaneously?

Answer: A controller with multiple independent channels or high-current simultaneous multi-igniter capability

Cluster ignition requires a controller capable of simultaneously firing multiple igniters, either through multiple channels or a single high-current channel rated for parallel igniter loads.

According to NAR safety rules, who holds final authority to give the launch command at a sanctioned high-power rocket launch?

Answer: The Range Safety Officer (RSO) or designated launch control officer

The RSO or designated launch control officer holds final authority over the firing command, ensuring all safety checks are satisfied before ignition is authorized.