A maintenance technician installed a 'hot mic' switch on the captain's yoke upside-down.

Attributes
ACN	1370016
Time
Date	201606
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Microphone
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance

Narrative:

I was told to install a hot mic switch on the captain's yoke. I gained access to switch and wires before uninstall I labeled the 3 wires accordingly. Proceeded with the uninstall cut the wires; strip off the insulation and resoldered the 3 wires to the new switch as labeled. Reinstalled switch on yoke and ops checked it by comparing it with the first officers's side. Ops check good. Signed it off. Pilot noticed the switch was upside down.I just soldered the 2 wires reverse of each other and installed switch upside down; so it function correctly upside down but right side up it was backwards. I then reinstalled the switch right side up. Signed it off as flipped switch. Then pilot noticed the hot mic switch and push to talk was reversed.

Original NASA ASRS Text

Title: A maintenance Technician installed a 'Hot Mic' Switch on the captain's yoke upside-down.

Narrative: I was told to install a hot mic switch on the captain's yoke. I gained access to switch and wires before uninstall I labeled the 3 wires accordingly. Proceeded with the uninstall cut the wires; strip off the insulation and resoldered the 3 wires to the new switch as labeled. Reinstalled switch on yoke and ops checked it by comparing it with the First Officers's side. Ops check good. Signed it off. Pilot noticed the switch was upside down.I just soldered the 2 wires reverse of each other and installed switch upside down; so it function correctly upside down but right side up it was backwards. I then reinstalled the switch right side up. Signed it off as flipped switch. Then pilot noticed the hot mic switch and push to talk was reversed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.