B767-300 first officer reported returning to the gate after experiencing loss of a number of compone...

Attributes
ACN	1380477
Time
Date	201606
Local Time Of Day	1201-1800
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 11700 Flight Crew Type 860
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

During preflight; I checked all the circuit breaker panels. I saw that there was a circuit breaker collared behind the first officer (first officer) seat; but it looked like the normal collars that are used on items that have been deactivated. So I thought nothing of it.we pushed back; started both engines; shut down the APU and taxied out on two engines.then a weather delay caused us to shut an engine down to save gas. The moment we shutdown the number two engine; we lost all kinds of things. And got some odd EICAS messages. Then the avionics stopped cooling properly. We called [maintenance]; but after a while they told us to return to the gate. Eventually it became clear that the bus ties were not working.we got back to the gate and a mechanic found that the collared circuit breaker behind the first officer seat was the 'bus tie enable' circuit breaker. He said that whoever put that collar on should have used the red collars that have 'remove before flight' ribbons on it. The mechanic took it very seriously and said he was going to follow up with proper reports and with the maintenance training department.

Original NASA ASRS Text

Title: B767-300 First Officer reported returning to the gate after experiencing loss of a number of components following an engine shutdown during taxi. Maintenance found a bus tie circuit breaker was improperly collared.

Narrative: During preflight; I checked all the CB panels. I saw that there was a CB collared behind the First Officer (FO) seat; but it looked like the normal collars that are used on items that have been deactivated. So I thought nothing of it.We pushed back; started both engines; shut down the APU and taxied out on two engines.Then a weather delay caused us to shut an engine down to save gas. The moment we shutdown the number two engine; we lost all kinds of things. And got some odd EICAS messages. Then the avionics stopped cooling properly. We called [Maintenance]; but after a while they told us to return to the gate. Eventually it became clear that the bus ties were not working.We got back to the gate and a mechanic found that the collared CB behind the FO seat was the 'bus tie enable' CB. He said that whoever put that collar on should have used the red collars that have 'remove before flight' ribbons on it. The mechanic took it very seriously and said he was going to follow up with proper reports and with the Maintenance training department.

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.

B767-300 first officer reported returning to the gate after experiencing loss of a number of components following an engine shutdown during taxi. Maintenance found a bus tie circuit breaker was improperly collared.