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Last updated: 6 December 2021
Statuts:Enquête Officielle
Date:vendredi 30 juillet 1971
Heure:14:02
Type/Sous-type:Silhouette image of generic B722 model; specific model in this crash may look slightly different
Boeing 727-281
Compagnie:All Nippon Airways - ANA
Immatriculation: JA8329
Numéro de série: 20436/788
Année de Fabrication: 1971-03-02 (5 months)
Heures de vol:865
Moteurs: 3 Pratt & Whitney JT8D-9
Equipage:victimes: 7 / à bord: 7
Passagers:victimes: 155 / à bord: 155
Total:victimes: 162 / à bord: 162
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:près de Shizukuishi (   Japon)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Sapporo-Chitose Airport (CTS/RJCC), Japon
Aéroport de destination:Tokyo-Haneda Airport (HND/RJTT), Japon
Numéro de vol:NH58
Détails:
All Nippon flight 58, a Boeing 727-200, departed Sapporo-Chitose Airport at 13:33 hours local time for a domestic flight to Tokyo-Haneda Airport, Japan. The flight was cleared to follow airway J11L and climb to FL280.
About the same time, at 13:28, two North American F-86F fighters of the Japan Air Self Defense Force took off from Matsushima Air Base for a formation training flight. The instructor in one aircraft and a student in the other aircraft (92-7932) were going to practice several formations in training airspace located 9 km from airway J11L.
While maneuvering during the formation sequence, the instructor inadvertently flew outside the training airspace. He crossed the airway J11L and then performed a 180 degree turn back towards the training area. In order to do so, the formation had to cross J11L again. The formation was flying about the same altitude as flight 58, causing a conflict.
The trainee was following the instructor and did not watch out for traffic when the 727 approached. The instructor ordered him to break away from the 727. The trainee banked to the left but the leading edge of the right wing of his F-86F struck the left horizontal stabilizer of the ANA plane. The fighter's right wing broke off, causing the plane to crash out of control, but the pilot ejected safely. The Boeing 727 sustained damage to the stabilizer and entered an uncontrolled descent. It passed the sound barrier and subsequently broke up.

Probable Cause:

Cause:
The first reason was that the instructor continued the training flight without noticing that he had left the training airspace and entered the jet route J11L.
The second reason was:
- It is estimated that the All Nippon Airways pilots saw the training aircraft at least 7 seconds before the collision, but the avoidance operation was not performed until just before the collision. This is probably because the ANA pilot did not anticipate the collision.
- For the instructor, the trainee's instruction to avoid a collision was shortly given to the trainee immediately before he saw the ANA aircraft, and he could not avoid the trainee's collision. This is probably because the instructor was unable to see the ANA aircraft.
- About two seconds before the collision, the trainee visually recognized the ANA aircraft slightly to the right of the accident aircraft, and immediately performed an avoidance operation, but was unable to avoid the collision. It is considered that this is because the trainee had little experience in this manoeuvre and was mainly devoted to maintaining the relative position with the instructor aircraft, and it was delayed in observing the ANA aircraft.

Accident investigation:
cover
Investigating agency: 
Status: Investigation completed
Download report: Final report


Photos

photo of Boeing-727-281-JA8329
photo of Boeing-727-281-JA8329
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Sapporo-Chitose Airport et Tokyo-Haneda Airport est de 814 km (509 miles).
Accident location: Exact; as reported in the official accident report.

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 tel qu'ils sont connus à ce jour.
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