B767 first officer reported diverting to an alternate airport after a very loud noise developed in t...

Attributes
ACN	1367851
Time
Date	201606
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 210 Flight Crew Type 3092
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

At 37;000 ft in cruise for probably almost an hour all of the sudden got a very loud horn or siren sound on the flight deck. This sound was so loud it made flight deck communications and external communications very difficult. Captain tried to contact dispatch and maintenance while I flew the airplane and handled the radios. Communication with dispatch and fas was difficult and was compounded by my flying and having a hard time talking to ATC. We landed at the airport we felt was most suitable at the time. We were unable to get enroute weather from dispatch or ATC. Later we encountered turbulence with the seatbelt sign on.

Original NASA ASRS Text

Title: B767 First Officer reported diverting to an alternate airport after a very loud noise developed in the cockpit possibly related to a pneumatic duct leak that interfered with communications.

Narrative: At 37;000 ft in cruise for probably almost an hour all of the sudden got a very loud horn or siren sound on the flight deck. This sound was so loud it made flight deck communications and external communications very difficult. Captain tried to contact dispatch and maintenance while I flew the airplane and handled the radios. Communication with dispatch and FAs was difficult and was compounded by my flying and having a hard time talking to ATC. We landed at the airport we felt was most suitable at the time. We were unable to get enroute weather from dispatch or ATC. Later we encountered turbulence with the seatbelt sign on.

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 first officer reported diverting to an alternate airport after a very loud noise developed in the cockpit possibly related to a pneumatic duct leak that interfered with communications.