Crj-200 first officer reported the captain leaving him alone in the flight station while he accompan...

Narrative:

The flight attendant called and spoke to the captain about a noise coming from the aircraft. The captain told me; 'you have the flight deck. Lock the door behind me.' I initially presumed the flight attendant would come to the flight deck; but then figured that the captain wished for her to physically show him where the sound was coming from since he was up immediately.I locked the door behind him and concentrated on flying the aircraft. The captain called me via interphone about two minutes later and was allowed back into the flight deck. He informed me that the situation was in no way serious and said it likely was caused by an environmental control system (ecs) tubing conduit located behind a panel. The flight proceeded without incident.lack of communication was the root cause of this event. I recognized that the flight attendant usually comes up front when a pilot leaves the cockpit; but thought the captain needed to see and discuss the issue in person with the flight attendant. The plan wasn't really discussed.better communication would have allowed us to better discuss the plan.

Original NASA ASRS Text

Title: CRJ-200 First Officer reported the Captain leaving him alone in the flight station while he accompanied the flight attendant to examine the source of a noise which concerned her.

Narrative: The flight attendant called and spoke to the Captain about a noise coming from the aircraft. The Captain told me; 'You have the flight deck. Lock the door behind me.' I initially presumed the flight attendant would come to the flight deck; but then figured that the Captain wished for her to physically show him where the sound was coming from since he was up immediately.I locked the door behind him and concentrated on flying the aircraft. The Captain called me via Interphone about two minutes later and was allowed back into the flight deck. He informed me that the situation was in no way serious and said it likely was caused by an Environmental Control System (ECS) tubing conduit located behind a panel. The flight proceeded without incident.Lack of communication was the root cause of this event. I recognized that the flight attendant usually comes up front when a pilot leaves the cockpit; but thought the Captain needed to see and discuss the issue in person with the flight attendant. The plan wasn't really discussed.Better communication would have allowed us to better discuss the plan.

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	1397674
Time
Date	201610
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
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	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning Distribution Ducting Clamps Connectors
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Security

Crj-200 first officer reported the captain leaving him alone in the flight station while he accompanied the flight attendant to examine the source of a noise which concerned her.