Emb-135 first officer reported overlooking a circuit breaker that was pulled and collared by mainten...

Narrative:

Based on the final cockpit scan as directed by AOM1 (aircraft operating manual); me and the captain checked the circuit breakers were in closed or out and collared; after takeoff we had a lg/lever disagree we [requested priority handling] and followed the procedures back to ZZZ. I meet the maintenance guys at the bridge and I heard from them taking to the flight attendant that they were working on the same problem we had (landing gear not retracting).I understand that the reason behind the lg/level disagree was a circuit breaker was pulled out and collared based of AOM1 when I checked the circuit breaker in the cockpit safety scan I ensures that all breakers are in (closed) or out(collared). I will take my time to check each collared circuit breaker before flying the aircraft.

Original NASA ASRS Text

Title: EMB-135 First Officer reported overlooking a circuit breaker that was pulled and collared by Maintenance and caused an Air Turnback when the landing gear would not retract.

Narrative: Based on the final cockpit scan as directed by AOM1 (Aircraft Operating Manual); me and the Captain checked the circuit breakers were in closed or out and collared; after takeoff we had a LG/LEVER DISAGREE we [requested priority handling] and followed the procedures back to ZZZ. I meet the maintenance guys at the bridge and I heard from them taking to the Flight Attendant that they were working on the same problem we had (landing gear not retracting).I understand that the reason behind the LG/LEVEL DISAGREE was a circuit breaker was pulled out and collared based of AOM1 when I checked the circuit breaker in the cockpit safety scan I ensures that all breakers are IN (closed) or OUT(collared). I will take my time to check each collared circuit breaker before flying the aircraft.

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.

Attributes
ACN	1687063
Time
Date	201909
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	EMB ERJ 135 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Gear Extend/Retract Mechanism
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Emb-135 first officer reported overlooking a circuit breaker that was pulled and collared by maintenance and caused an air turnback when the landing gear would not retract.