Individually Owned: 150,657
Corporate Owned: 137,281
Teterboro Airport
Aircraft Accident/Incident Report
Teterboro, New Jersey 07608
Wednesday, December 1, 2004 16:23 EST
NTSB Narrative Summary Released at Completion of Accident
The flight was cleared for the ILS Runway 19 approach, circle-to-land on Runway 24; a 6,013-foot-long, 150-foot wide, asphalt runway. The auto throttle and autopilot were disengaged during the approach, about 800 feet agl. However, the auto throttle reengaged just prior to touchdown, about 35 feet agl. The flightcrew did not recall reengaging the auto throttle, and were not aware of the autothrottle reengagement. According to the auto throttle computers, the reengagement was commanded through one of the Engage/Disengage paddle switches located on each power lever. The target airspeed set for the auto throttle system was 138 knots. After touchdown, as the airplane decelerated below 138 knots, the auto throttle system gradually increased the power levers in an attempt to maintain the target airspeed. Without the power levers in the idle position, the ground spoilers and thrust reversers would not deploy. While the flightcrew was pulling up on the thrust reverser levers, they may not have initially provided enough aft force on the power levers (15 to 32 lbs.) to override and disconnect the auto throttle system. The flight data recorder indicated that the autothrottle system disengaged 16 seconds after the weight-on-wheels switches were activated in ground mode. As the airplane neared the end of the runway, the pilot engaged the emergency brake, and the airplane departed the right side of the runway. The auto throttle Engage/Disengage paddle switches were not equipped with switch guards. Although the autothrottle system provided an audible tone when disengaged, it did not provide a tone when engaged. The reported wind about the time of the accident was from 290 degrees at 16 knots, gusting to 25 knots, with a peak wind from 300 degrees at 32 knots.
NTSB Probable Cause Narrative
The flightcrew's inadvertent engagement of the autothrottle system, and their failure to recognize the engagement during landing, which resulted in a runway excursion. Factors were the lack of autothrottle switch guards, lack of an autothrottle engagement audible tone, and gusty winds.
Event Information
| Type of Event | Accident |
| Event Date | 12/1/2004 |
| Event Day of the Week | Wednesday |
| Time of Event | 1623 |
| Event Time Zone | Eastern Standard Time |
| Event City | Teterboro |
| Event State | NEW JERSEY |
| Event Country | -- |
| Zipcode of the event site | 07608 |
| Event Date Year | 2004 |
| Event Date Month | 12 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 405100N |
| Event Location Longitude | 0740339W |
| Event Location Airport | Teterboro Airport |
| Event Location Nearest Airport ID | TEB |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | -- |
| Airport Elevation | 9 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1651 Eastern Standard Time |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | TEB |
| Elevation of weather observation facility | 9 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | EST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | 6000 |
| Sky/Lowest/Cloud Conditions | Few |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 11 |
| Dew Point at event time (in degress fahrenheit) | 1 |
| Wind Direction (degrees magnetic) | 290 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 16 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 25 |
| Altimeter Setting at event time (in. Hg) | 29.62 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 9 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 20088 |
| NTSB Notification Source | FAA Teterboro FSDO |
| NTSB Notification Date | Dec 2 2004 12:00AM |
| NTSB Notification Time | 930 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | May 30 2006 1:54PM |
| User who most recently changed record | NTSB\JOHB |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Teterboro, NJ |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | G-GMAC |
| NTSB Number | NYC05FA026 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Non-U.S., Commercial |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Gulfstream Aerospace |
| Aircraft Model | G-IV |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 1058 |
| Certified Max Gross Weight | 75000 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 18 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Jul 1 2004 12:00AM |
| Airframe hours since last inspection | 245 |
| Airframe Hours | 7452 |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | Gama Aviation Ltd. |
| Aircraft Owner Street Address | Business Aviation Centre, Farnborough Airport |
| Aircraft Owner City | Hampshire |
| Aircraft Owner State | -- |
| Aircraft Owner Country | -- |
| Aircraft Owner Zipcode | -- |
| Operator is an individual? | No |
| Operator Name | -- |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Non-scheduled |
| Indicates Domestic or International Flight | International |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | -- |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | EGGW |
| Departure City | Luton |
| Departure State | -- |
| Departure Country | UK |
| Departure Time | 823 |
| Departure Time Zone | EST |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | TEB |
| Destination City | Teterboro |
| Destination State | NJ |
| Destination Country | USA |
| Specific Phase of Flight | Landing |
| Report sent to ICAO? | No |
| Evacuation occurred | Yes |
| Date of most recent change to record | Jan 20 2006 2:18PM |
| User who most recently changed record | NTSB\HAMG |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 24 |
| Runway Length | 6013 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |