ASN logo
Last updated: 21 September 2020
Status:Final
Date:Monday 17 September 1979
Time:12:26
Type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-32
Operator:Air Canada
Registration: CF-TLU
C/n / msn: 47196/288
First flight: 1968
Total airframe hrs:28425
Cycles:26816
Engines: 2 Pratt & Whitney JT8D-7B
Crew:Fatalities: 0 / Occupants: 5
Passengers:Fatalities: 0 / Occupants: 40
Total:Fatalities: 0 / Occupants: 45
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:E of Boston, MA (   United States of America)
Phase: En route (ENR)
Nature:International Scheduled Passenger
Departure airport:Boston-Logan International Airport, MA (BOS/KBOS), United States of America
Destination airport:Yarmouth Airport, NS (YQI/CYQI), Canada
Flightnumber:AC680
Narrative:
At 12:12 local time Air Canada Flight 680, a scheduled passenger flight to Yarmouth, Nova Scotia, Canada, departed Logan International Airport, Boston, Massachusetts, USA. About 14 min after takeoff, at an altitude of about 25,000 ft msl, the tailcone along with the aft cabin pressure access door and a portion of the aft cabin pressure bulkhead separated from the aircraft causing rapid decompression of the passenger and flightcrew compartments. The aircraft was landed safely at Logan International Airport about 38 min after takeoff. Of the 45 persons aboard, one flight attendant received minor injuries during the decompression. The aircraft's oxygen system and its elevator control and engine control systems were damaged.

Probable Cause:

The National Transportation Safety Board determines that the probable cause of the accident was a fatigue fracture of the aft cabin pressure bulkhead which resulted in a rapid decompression of the aircraft's cabin area. This fracture initiated from a crack below the aft bulkhead access door which was discernible on the X-rays taken during the aircraft's last maintenance inspection but was not detected by the inspectors.

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 5 months
Accident number: NTSB/AAR-80-13
Download report: Final report

Classification:
Explosive decompression
Forced landing on runway

Photos

Add your photo of this accident or aircraft

Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Boston-Logan International Airport, MA to Yarmouth Airport, NS as the crow flies is 428 km (268 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
languages: languages

Share