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.
|Datum:||Thursday 5 December 2013|
|Type:||McDonnell Douglas DC-9-31|
|Luchtvaartmaatschappij:||Delta Air Lines|
|Motoren:|| 2 Pratt & Whitney JT8D-7|
|Bemanning:||slachtoffers: 6 / inzittenden: 6|
|Passagiers:||slachtoffers: 82 / inzittenden: 83|
|Totaal:||slachtoffers: 88 / inzittenden: 89 |
|Gevolgen:|| Written off (damaged beyond repair)|
|Plaats:||Boston-Logan International Airport, MA (BOS) (Verenigde Staten)
|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|
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."
» Air Disasters / D.Gero (118-120)
» ICAO Circular 132-AN/93 (79-90)
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).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.