Maintenance Procedures and Safety Flashcards

Which type of fire extinguisher is approved for use on an avionics bench fire involving energized electrical equipment?

Answer: Class C dry chemical or CO2 extinguisher

Class C extinguishers (CO2 or dry chemical) are rated for energized electrical equipment fires because they use non-conductive extinguishing agents.

A technician finds that an avionics connector pin is recessed (pushed back) in its housing. The CORRECT repair procedure is to:

Answer: Use the approved extraction and insertion tool for that connector series

Approved extraction and insertion tools must be used to prevent damage to the connector housing, pin contacts, and adjacent pins during repair.

Under what condition is it permissible to deviate from a Maintenance Manual procedure during avionics maintenance?

Answer: When an approved Engineering Order (EO) or Deviation Authorization from the aircraft manufacturer or FAA has been issued

Deviations from approved maintenance procedures require a written Engineering Order or FAA authorization; experience alone does not authorize departures from the manual.

What action must be taken with a circuit breaker that has tripped during avionics maintenance on an energized aircraft bus?

Answer: Investigate the cause of the trip before resetting, following troubleshooting procedures

A tripped circuit breaker indicates an overcurrent condition that must be investigated before resetting, as resetting into a fault can cause wiring damage or fire.

Which of the following correctly describes 'Safety Wire' (safetying) application on avionics rack mounting hardware?

Answer: Wire is threaded so that rotation of the fastener in the loosening direction tightens the wire

Safety wire must be installed so that the fastener cannot rotate in the loosening direction without pulling the wire taut, providing positive locking.

An avionics technician is about to perform maintenance on an aircraft that recently landed. What is the primary concern regarding the aircraft's capacitors in the power supply circuits?

Answer: Capacitors may retain a dangerous charge even after aircraft power is removed

Large filter capacitors in avionics power supplies can retain lethal stored charge for extended periods after power is disconnected, requiring discharge procedures before contact.

When an avionics maintenance task requires working at night in the aircraft hangar, which lighting requirement applies to ensure safety and work quality?

Answer: Lighting must meet a minimum of 30 foot-candles at the work surface per OSHA 1910.303 guidelines

OSHA standards require a minimum illumination level at work surfaces to ensure technicians can accurately read wiring colors, labels, and torque marks.