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Failure Modes and Effects

A failure modes and effects analysis (FMEA) is normally conducted at a component level and subsequently at a system level for each new design. This is used to establish a failure effects list. For each part in the parts list, as detailed in the System Description, this list contains

Table 19.13 Typical failure effects list (partial).

Part no.

Description

Possible failure mode

Mitigation

Failure probability given mitigation, inspection, and service

Risk

SPT-A-F-006-01-B

Autopilot GPS antenna

Loss of signal from satellite

Autopilot initialization sequence indicates lack of signal before takeoff. Autopilot can maintain control if GPS signal is lost in flight. Manual override is an option

Unlikely

C

SPT-A-F-007-01-B

Generator power unit (GPU)

Damage due to overvoltage, overheating, or impact

Overvoltage highly unlikely if correct ground power supply battery is used. Heat sink and fan help prevent overheating. Second GPU provides redundancy

Unlikely

C

SPT-A-F-008-01-B

IG-04

Ignition unit

Overvoltage or disconnection from/damage to loom.

Use high-quality connectors, do not overstress loom. Telemetry warns GCS operator if engine fails in flight. Second engine allows aircraft to return to base

Unlikely

C

the following entries: part no., description, possible failure mode, mitigation, failure probability given mitigation, inspection and service intervals, and risk. If all the UAS manuals refer to a common parts database, errors and duplication are avoided when constructing this list. Table 19.13 shows a short section from such a list.

 
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