ASN Wikibase Occurrence # 351881
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| Date: | Wednesday 20 January 1999 |
| Time: | 05:00 LT |
| Type: |  Boeing 747-238B |
| Owner/operator: | Continental Airlines |
| Registration: | N14024 |
| MSN: | 20534/195 |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 18109 hours |
| Engine model: | P&W JT9D-7F |
| Fatalities: | Fatalities: 0 / Occupants: 354 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | over Pacific Ocean -
 United States of America
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Tokyo-Narita Airport (NRT) |
| Honolulu International Airport, HI (HNL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Continental Airlines Boeing 747-238B departed Tokyo en route to Honolulu on a regularly scheduled passenger flight. The crew reported that turbulence had been forecasted. Approximately 59 minutes after departure, while cruising at FL330 in dark night conditions, the captain observed a sudden fluctuation in outside air temperature and the aircraft entered an area of wave activity. The Captain illuminated the seat belt signs and within 5-8 seconds the aircraft encountered severe clear air turbulence (CAT) which lasted for approximately 10 minutes. The aircraft continued on to its destination of Honolulu, Hawaii. Review of meteorological information indicated two jet streams traversing the area, one at 34,000 feet at 160 knots, and the other to the south at 39,000 feet at 180 knots. The jet streams generally diverged in the area of the event.
A satellite image taken at the time of the event indicated a band of high level clouds in the immediate area. The clouds were aligned in a 'band' formation oriented northwest to southeast, and perpendicular to the wind flow pattern. This pattern was similar to previous CAT encounters with transverse wave cloud patterns. No useful information was available from either the cockpit voice or flight data recorders.
Probable Cause: An encounter with Clear Air Turbulence at Flight Level 330.
Accident investigation:
 |
|
Sources:
NTSB SEA99IA032
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Feb-2024 20:49 | ASN Update Bot | Added |
| 21-Feb-2024 20:56 | ASN | Updated [Operator, Location, Phase, Nature, Departure airport, Destination airport, Narrative] |
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