Page 162 Cite

Suggested Citation:"Appendix E: L-3 Failure Modes and Effects Analysis Document." National Academies of Sciences, Engineering, and Medicine. 2017. Airport Passenger Screening Using Millimeter Wave Machines: Compliance with Guidelines. Washington, DC: The National Academies Press. doi: 10.17226/24936.

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E

L-3 Failure Modes and Effects Analysis Document

The L3 Failure Modes and Effects Analysis document is reprinted in this appendix.

Page 163 Cite

Suggested Citation:"Appendix E: L-3 Failure Modes and Effects Analysis Document." National Academies of Sciences, Engineering, and Medicine. 2017. Airport Passenger Screening Using Millimeter Wave Machines: Compliance with Guidelines. Washington, DC: The National Academies Press. doi: 10.17226/24936.

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TABLE E.1

Component	Device Detail	Failure Mode	System Effects
Assembled transmitter source, switching matrix and antenna elements.	Each antenna mast includes a single transceiver. Mast RF path block diagram is the same for the all ProVision systems	Failures on the antenna mast will be at the component level as detailed in the list below
Transceiver	Output power amplfier, This is the last amplification stage in the TX path.	Amplifer integrated circuit failure	Reduced TX output power on all antenna elements detectable degradation in system self test.
Transceiver	Output amplifier input source	Overdrive of RF input into transceiver output amplifier	TX output power would not increase above the normal operating level for the system.
Transceiver	Output amplifier input source	Pulse modulator control circuit malfunctions.	Peak TX output power level would be the same as in normal operation.
Transceiver to manifold cable	Semi-rigid coaxial cable.	Mechanical damage to cable	Reduced TX output on all antenna elements, detectable degradation in system self test.
Manifold Switch	Connectorized switch module. MMIC switch components are the only active devices in the signal path.	Switch integrated circuit failure	Reduced TX output on one or more antenna modules, detectable degradation in system self test.
Manifold Switch	Input coaxial cable	Compromised connection on coax input cable from the transceiver.	Reduced output power on all manifold ports and corresponding down stream antenna ports, detectable degradation in system self test.
Manifold Switch	Power and control cable to manifold switch	Compromised connection of power and control signal ribbon cable.	Significantly reduced TX output, detectable degradation in system self test.
Manifold Switch	Manifold switch control circuitry	Damaged control circuit	Reduced TX output on many antenna ports, detectable degradation in system self test.
Manifold Switch	Output port coaxial connector	Compromised connection on the output port coax connector.	Reduced TX output to one of the antenna modules, detectable degradation in system self test.

Page 164 Cite

Suggested Citation:"Appendix E: L-3 Failure Modes and Effects Analysis Document." National Academies of Sciences, Engineering, and Medicine. 2017. Airport Passenger Screening Using Millimeter Wave Machines: Compliance with Guidelines. Washington, DC: The National Academies Press. doi: 10.17226/24936.

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Component	Device Detail	Failure Mode	System Effects
Flexible cable manifold to antenna	Flexible coaxial cable.	Mechanical damage to cable	Reduced TX output on a single antenna module, detectable degradation in system self test.
Antenna module	Custom module with coax input and integrated antenna element outputs. GaAs MMIC switch components are the only active devices in the signal path.	Switch integrated circuit failure	Reduced TX output on one or more antenna elements, detectable degradation in system self test.
Antenna module	Input port coaxial connector	Compromised connection on input signal coax connector.	Reduced TX output to all antenna elements on the module, detectable degradation in system self test.
Antenna module	Power and control cable to manifold switch	Compromised connection of power and control signal ribbon cable.	Greatly reduced TX output, detectable degradation in system self test.
Antenna module	Antenna switch control circuitry	Damaged control circuit	No TX output on many antenna ports, detectable degradation in system self test.
Antenna module	Antenna element	Compromised antenna feed structure	RF output degradation on a single element, detectable degradation in system self test.

NOTE: GaAs, gallium arsenide; MMIC, monolithic microwave integrated circuit; RF, radio frequency; TX, transmitter.

Page 165 Cite

Suggested Citation:"Appendix E: L-3 Failure Modes and Effects Analysis Document." National Academies of Sciences, Engineering, and Medicine. 2017. Airport Passenger Screening Using Millimeter Wave Machines: Compliance with Guidelines. Washington, DC: The National Academies Press. doi: 10.17226/24936.

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