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| Date: | Saturday 21 July 1979 |
| Time: | |
| Type: |  NAMC YS-11-109 |
| Owner/operator: | Toa Domestic Airlines |
| Registration: | JA8656 |
| MSN: | 2020 |
| Year of manufacture: | 1965 |
| Fatalities: | Fatalities: 0 / Occupants: 71 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial, repaired |
| Category: | Accident |
| Location: | Haneda Airport -
 Japan
|
| Phase: | Landing |
| Nature: | Passenger - Scheduled |
| Departure airport: | RJTT |
| RJBD | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On July 21, 1979, at approximately 8:38 a.m., Toa Domestic Airlines Flight 381 took off from Haneda Airport bound for Nanki-Shirahama Airport. After takeoff, the wheel lights, which should have gone out immediately after takeoff (gear-up), went out only slightly later on the left rear wheel. The captain, who felt a sense of discomfort, operated the gear down lever to make sure, but the left rear wheel remained retracted and did not come down.
The captain declared an emergency to the control tower at Haneda, but the situation could not be confirmed because the wheel was not visible from the cockpit, and there was also the possibility that it was simply an equipment malfunction. The captain obtained permission from the tower to fly in formation, which was unusual for a passenger aircraft, with the assistance of a DC-9 aircraft that happened to be flying near Flight 381 toward Haneda, and the pilot of the DC-9 visually observed that not even the gear storage door was open, and the captain decided to make an emergency landing at Haneda immediately. At around 11:32 a.m., the DC-9 entered the landing with one leg in the air.
The landing itself went smoothly, but as the speed decreased, the aircraft tilted to the left rearward without legs and the fuselage scraped the runway violently, resulting in an excursion off the runway. However, the landing was successful, and the aircraft escaped a fire caused by the impact.
The cause of the accident was the upper mechanism of the retractable door. This door had been assembled incorrectly during maintenance, and the “up-lock hook,” a part that lifts and locks the wheels, broke and cracked due to metal fatigue.
Accident investigation:
 |
|
Sources:
https://ja.wikipedia.org/wiki/%E6%9D%B1%E4%BA%9C%E5%9B%BD%E5%86%85%E8%88%AA%E7%A9%BA381%E4%BE%BF%E8%83%B4%E4%BD%93%E7%9D%80%E9%99%B8%E4%BA%8B%E6%95%85
https://www.mlit.go.jp/jtsb/aircraft/rep-acci/55-5-JA8656.pdf
https://jtsb.mlit.go.jp/jtsb/aircraft/detail.php?id=258
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-May-2024 08:43 | yukipara3 | Added |
| 17-May-2024 08:44 | ASN | Updated [Accident report] |
Corrections or additions? ... Edit this accident description
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