Accident
Last updated: 23 April 2014
Statuts:Enquête Officielle
Date:lundi 28 septembre 1992
Heure:14:30
Type/Sous-type:Airbus A300B4-203
Compagnie:Pakistan International Airlines - PIA
Immatriculation: AP-BCP
Numéro de série: 025
Année de Fabrication: 1976-03-23 (16 years 6 months)
Heures de vol:39045
Cycles:19172
Moteurs: 2 General Electric CF6-50C2
Equipage:victimes: 19 / à bord: 19
Passagers:victimes: 148 / à bord: 148
Total:victimes: 167 / à bord: 167
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:18 km (11.3 milles) S of Kathmandu-Tribhuvan Airport (KTM) (   Népal) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Intern.
Aéroport de départ:Karachi International Airport (KHI/OPKC), Pakistan
Aéroport de destination:Kathmandu-Tribhuvan Airport (KTM/VNKT), Népal
Numéro de vol: 268
Détails:
PIA Flight 268 departed Karachi (KHI) at 11:13 for a flight to Kathmandu (KTM). The en route portion of the flight was uneventful and the aircraft was cleared for a Sierra approach to Kathmandu runway 02. The crew were instructed to maintain 11500 feet and report at 16DME (16 miles from the VOR/DME beacon, which is located 0,6 nm short of the runway). The Kathmandu approach is very difficult, since the airport is located in an oval-shaped valley surrounded by mountains as high as 9665 feet. Runway elevation is 4313 feet amsl. The next approach fixes for PIA268 were at 13 DME (at 10500 feet), 10 DME (at 9500 feet) and 8 DME (at 8200 feet). A few seconds after reporting 10 DME, the aircraft was descending through 8200 feet- which was the altitude for 8 DME. The Airbus crashed into a steep cloud-covered hillside at approx. 7300 feet amsl., at 9,16 DME.

Cause:
"The balance of evidence suggests that the primary cause of the accident was that one or both pilots consistently failed to follow the approach procedure and inadvertently adopted a profile which, at each DME fix, was one altitude step ahead and below the correct procedure. Why and how that happened could not be determined with certainty because there was no record of the crew's conversation on the flight deck.
Contributory causal factors were thought to be the inevitable complexity of the approach and the associated approach chart."

Sources:
» Flight International 31.3-6.4.1993 (4)
» Air Safety Week 6.2.1995 (p. 5)
» Air Safety Week 5.10.92 (3/4)
» Asia Pacific Air Safety Dec. 1992 (10-12)
» Aviation Week & Space Technology 5.10.92 (36)
» Flight International 4-10.11.1992 (8)
» ICAO Adrep Summary 2/94 (#1)


Opérations de secours

Nepal issued 21 Safety Recommendations

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Karachi International Airport et Kathmandu-Tribhuvan Airport est de 1827 km (1142 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
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