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NTSB Report
September 17, 1979 · Mcdonnell Douglas DC9 32 · CF-TLU
Boston, MA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 17, 1979
Injury Outcomes
1 injury (1 minor injury), 44 uninjured
Location
Boston, MA
Aircraft
Mcdonnell Douglas DC9 32 (1968)
Tail Number
CF-TLU
Operator
Air Canada
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
NYC79AA106
The Safety Board's full report is available at http://www.ntsb.gov/investigations/AccidentReports/Pages/aviation.aspx. The Aircraft Accident Report number is NTSB/AAR-80-13. At 1212 EDT, on September 17, 1979, Air Canada Flight 680, a scheduled passenger flight to Yarmouth, Nova Scotia, Canada, departed Logan International Airport, Boston, Massachusetts. 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.
NTSB Probable Cause
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.
Full Narrative
The Safety Board's full report is available at http://www.ntsb.gov/investigations/AccidentReports/Pages/aviation.aspx. The Aircraft Accident Report number is NTSB/AAR-80-13. At 1212 EDT, on September 17, 1979, Air Canada Flight 680, a scheduled passenger flight to Yarmouth, Nova Scotia, Canada, departed Logan International Airport, Boston, Massachusetts. 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.
Flight
Event TypeAccident
Event Time12:12 EDT
Nearest Airport0nm
Flight Plan FiledIFR
Flight Plan ActivatedYes
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas DC9 32
Tail NumberCF-TLU
Aircraft CategoryAir
DamageSubstantial
OperatorAir Canada
Operating RulePart 129
Engines2
Engine TypeTurbofan
Engine DetailsPratt & Whitney · JT8D-7 · Turbofan | Pratt & Whitney · JT8D-7 · Turbofan
Seats102
People & Injuries
Injury Summary1 injury (1 minor injury), 44 uninjured
Fatal0
Serious0
Minor1
Uninjured44
Total45
Crew 1Age 44 · First Class · None
Crew 2Age 31 · First Class · None
Conditions
ConditionsVMC
LightDaylight
Wind240° @ 10 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point55
Altimeter30.23 inHg
Weather SourceWFAC