AET Maintenance Procedures and Safety 5

Question 1

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

Accepted Answer

Class C dry chemical or CO2 extinguisher

Answer

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

Question 2

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

Accepted Answer

Use the approved extraction and insertion tool for that connector series

Answer

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

Question 3

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

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

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

Answer

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

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Maintenance Procedures and Safety 5