Accident
Last updated: 1 September 2014
Status:Definitief
Datum:dinsdag 31 juli 1973
Tijd:11:08
Type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Luchtvaartmaatschappij:Delta Air Lines
Registratie: N975NE
Constructienummer: 47075/166
Bouwjaar: 1967
Aantal vlieguren:14639
Motoren: 2 Pratt & Whitney JT8D-7
Bemanning:slachtoffers: 6 / inzittenden: 6
Passagiers:slachtoffers: 82 / inzittenden: 83
Totaal:slachtoffers: 88 / inzittenden: 89
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:Boston-Logan International Airport, MA (BOS) (   Verenigde Staten) show on map
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Manchester Municipal Airport, NH (MHT/KMHT), Verenigde Staten
Vliegveld van aankomst:Boston-Logan International Airport, MA (BOS/KBOS), Verenigde Staten
Vluchtnummer: 723
Beschrijving:
As Delta Flight 723 was descending, the approach clearance was given by the controller after a delay, because the controller was preoccupied with a potential conflict between two other aircraft. This caused the flight to be poorly positioned for approach. The aircraft passed the Outer Marker at a speed of 385km/h (80km/h too fast) and was 60m above the glide slope.
The flight director was inadvertently used in the 'go-around-mode', which led to abnormal instrument indications. This caused some confusion. The first officer, who was flying the approach became preoccupied with the problem. The DC-9 continued to descend and struck a seawall 3000 feet short of and 150 feet to the right of runway 04R, crashed and caught fire. RVR at the time was 500m with 60m overcast.
All occupants, except one passenger, were killed in the crash. The lone survivor, who had been injured critically, died on December 11, 1973.


PROBABLE CAUSE: "The failure of the flight crew to monitor altitude and to recognize passage of the aircraft through the approach decision height during an unstabilized precision approach conducted in rapidly changing meteorological conditions. The unstabilized nature of the approach was due initially to the aircraft's passing the outer marker above the glide slope at an excessive airspeed and thereafter compounded by the flight crew's preoccupation with the questionable information presented by the flight director system. The poor positioning of the flight for the approach was in part the result of nonstandard air traffic control services."

Bronnen:
» Air Disasters / D.Gero (118-120)
» ICAO Circular 132-AN/93 (79-90)
» NSTB-AAR-74-3

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-74-03
report released:07-MAR-1974
duration of investigation:219 days (7.3 months)
download report: Delta Air Lines, Inc., DC-9-31, N975NE, Boston, Massachusetts, July 31, 1973 (NTSB/AAR-74-03)

Veiligheidsmaatregelen

NTSB issued 8 Safety Recommendations

Show all AD's and Safety Recommendations

Foto's

Add your photo of this accident or aircraft

Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Manchester Municipal Airport, NH en Boston-Logan International Airport, MA bedraagt 72 km (45 miles).

languages: English Franšais Nederlands Deutsch Espanol

Share
Share

DC-9-30

  • 14e ongeval
  • 662 built
  • 3e zwaarste ongeval (toen het plaatsvond)
  • 8e zwaarste ongeval (op dit moment)
safety profile

 Verenigde Staten
  • 5e zwaarste ongeval (toen het plaatsvond)
  • 20e zwaarste ongeval (op dit moment)
»safety profile