Crj-200 first officer reported omitting a step during takeoff; requiring an air turn back.

Narrative:

The plane had the lh aircond pack option 2 inoperative and we knew we had to do a bleed closed take off per the MEL. We also realized that switching the bleeds from the APU to the engs was slightly different from the normal procedure. Upon takeoff the captain who was the pilot flying called for flaps up after takeoff checklist. Upon going through the flow both of us we focusing on switching the bleeds per the way the MEL called for. Upon focusing on the bleed swap I forgot to tell him to reduce thrust to 60% N1. When we swapped the bleeds we got rh pack hitemp and we both knew it was because we forgot to reduce the thrust. We called ATC to cancel the climb and I got the QRH and went through the steps to try to get it back on. I also called the flight attendant in the back to let them know of the situation. When the pack wouldn't come back on we asked operations/ maintenance on what help they could provide to get the pack back on. Also ATC gave us a heading and an altitude of 8;000 ft. Until we could get the pack back on or determine what operations wants us to do; while we also tried to see if we had the gas to make if they told us to continue. Operations then sent us an ACARS message to return back to clt. We asked for vectors for the ILS 36R and shot the visual backed up with the ILS. Landing setup and procedures and taxi were all normal and per the standard.

Original NASA ASRS Text

Title: CRJ-200 First Officer reported omitting a step during takeoff; requiring an air turn back.

Narrative: The plane had the LH AIRCOND PACK OPTION 2 INOP and we knew we had to do a Bleed Closed take off per the MEL. We also realized that switching the Bleeds from the APU to the ENGs was slightly different from the normal procedure. Upon takeoff the Captain who was the pilot flying called for flaps up after takeoff checklist. Upon going through the flow both of us we focusing on switching the bleeds per the way the MEL called for. Upon focusing on the bleed swap I forgot to tell him to reduce thrust to 60% N1. When we swapped the bleeds we got RH PACK HITEMP and we both knew it was because we forgot to reduce the thrust. We called ATC to cancel the climb and I got the QRH and went through the steps to try to get it back on. I also called the Flight Attendant in the back to let them know of the situation. When the pack wouldn't come back on we asked operations/ Maintenance on what help they could provide to get the pack back on. Also ATC gave us a heading and an altitude of 8;000 ft. Until we could get the pack back on or determine what operations wants us to do; while we also tried to see if we had the gas to make if they told us to continue. Operations then sent us an ACARS message to return back to CLT. We asked for vectors for the ILS 36R and shot the visual backed up with the ILS. Landing setup and procedures and taxi were all normal and per the standard.

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	1691694
Time
Date	201910
Local Time Of Day	1201-1800
Place
Locale Reference	CLT.TRACON
State Reference	NC
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy