Boeing 747-122 N4719U
24 October 1991 · Denver, Colorado, United States · No injuries
Summary
On 24 October 1991 at about 20:00 local time, a Boeing 747-122 registered N4719U, operated by United Airlines, was involved in an incident near Denver, Colorado, United States. 280 people were on board and nobody was injured. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 20:00
- Classification
- Incident
- Location
- Denver, Colorado, United States
- Coordinates
- 39.7892, -104.9603
- Aircraft
- Boeing 747-122
- Registration
- N4719U
- Category
- Airplane
- Engines
- 4
- Operator
- United Airlines
- Operating rule
- Part 121: Air Carrier
- Purpose of flight
- Unknown
- Phase of flight
- Not recorded
- Route
- San Francisco → London
- Aircraft damage
- Not recorded
- Weather
- VMC
- Light
- Day
- NTSB number
- DEN92IA005
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 280 | 0 | 0 | 0 | 280 |
Probable cause
A MALFUNCTION IN THE STABILIZER TRIM CONTROL MODULE.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
DURING LEVEL OFF AT FLIGHT LEVEL 290, WHILE ON A SCHEDULED INTERNATIONAL PASSENGER FLIGHT FROM SAN FRANCISCO, CALIFORNIA, TO LONDON, ENGLAND, ELEVATOR PITCH CONTROL BECAME ERRATIC AND OSCILLATIONS OF UP TO 1,000 FEET EITHER SIDE OF THE BASE ALTITUDE OCCURRED. THE AUTO PILOT WAS DISCONNECTED, COMMUNICATIONS WITH MAINTENANCE CONTROL WAS HELD, AND THE FLIGHT PROCEEDED TO THE NEAREST AIRPORT WITH RUNWAYS EXCEEDING 10,000 FEET IN LENGTH. AN UNEVENTFUL PRECAUTIONARY LANDING WAS CONDUCTED IN DENVER, COLORADO. STABILIZER TRIM COMPONENTS WERE EXAMINED REVEALING DISCREPENCIES IN THE TRIM MODULE AND ELEVATOR FEEL COMPUTER, DUE TO NORMAL WEAR.
Quoted verbatim from the NTSB record.
Other Boeing 747 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 16 Jun 1991 | Boeing 747-400 | Philadelphia, Pennsylvania, United States | KLM Royal Dutch Airline | Serious injuries | - |
| 29 Dec 1991 | Boeing 747-200F | Taipei, Taiwan | China Airlines | Unknown | - |
| 29 Apr 1991 | Boeing 747SP | Churchville, New York, United States | United Airlines | No injuries | - |
| 22 Aug 1991 | Boeing 747-151 | Seattle, Washington, United States | Northwest Airlines, Inc | Minor injuries | - |
| 17 Oct 1991 | Boeing 747-300 | Houston, Texas, United States | KLM Royal Dutch Airline | No injuries | - |
| 13 Aug 1991 | Boeing 747-200 | Los Angeles, California, United States | Air New Zealand | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 2 Oct 1991 | Enstrom F-28C | Evergreen, Colorado, United States | James B. Highbanks | No injuries | - |
| 4 Oct 1991 | Cessna 172M | Erie, Colorado, United States | Tri-County Flight School | No injuries | - |
| 13 Oct 1991 | Piper PA-18-150 | Telluride, Colorado, United States | Christopher Carroll | No injuries | - |
| 30 Oct 1991 | Piper PA-24-250 | Ellicott, Colorado, United States | Southwest Aircraft Recovery | Minor injuries | - |
| 18 Nov 1991 | Piper PA-28-161 | Greeley, Colorado, United States | P.c. Flyers | No injuries | - |
| 20 Nov 1991 | Cessna 172N | Boulder, Colorado, United States | Dakota Ridge Aviation | No injuries | - |