LAX04LA184
2004-04-10 · San Jose, California, United States · None · 1 aircraft · Status: Completed
Airport SJC
Current FAA registration · N74270
- Make / Model
- GRUMMAN AMERICAN AA-5B
- Year of manufacture
- 1975 · 29 years old at event
- Engine
- LYCOMING O&VO-360 SER (180 hp)
- Seats / Engines
- 4 seats · 1 engine
- Last airworthiness date
- 19751214
- ADS-B equipped
- Yes — Mode-S A9FD5E
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
the pilot's encounter with jet blast effects. Factors in the accident were the pilots' inadequate situational awareness of the potential for the jet blast encounter after hearing the Global Express airplane on the frequency call ready for taxi, and, the ground controller's failure to issue a safety advisory.
Factual narrative
On April 10, 2004, at 1524 Pacific daylight time, a Grumman AA-5B, N74270, encountered jet blast from a large executive jet transport airplane while taxing to the ramp after landing at Norman Y. Mineta San Jose International Airport, San Jose, California. The pilot/owner was operating the airplane under the provisions of 14 CFR Part 91. The private pilot, the sole occupant, was not injured; the airplane sustained substantial damage. Visual meteorological conditions prevailed, and a flight plan had not been filed. The personal cross-country flight departed Columbia Airport, Columbia, California, about 1435. In a written statement, the pilot reported that he made an uneventful landing and taxied off the runway. He established communications with ground control, and was cleared to taxi to his requested destination via taxiway Victor. While taxiing, the airplane approached the San Jose Jet Center, where a Bombardier BD-700 Global Express, N949GP, was parked with its tail toward the taxiway. The Global Express' engines began to spool up, resulting in a jet blast toward the right side of the Grumman. The Grumman swerved uncontrollably, and the left axle sheared off. The Grumman incurred damage to the left outboard wing panel and the left side of the fuselage. Federal Aviation Administration Order 7110.65, Air Traffic Control, specifies procedures and practices to be used by air traffic control personnel. Section 2-1-20 (b) advises controllers to "Issue cautionary information to any aircraft if in your opinion, wake turbulence may have an adverse effect on it." Section 2-1-20 (note) specifies that "Although not mandatory during ground operations, controllers may use the words jet blast, propwash, or rotorwash, in lieu of wake turbulence, when issuing a cautionary advisory." A National Transportation Safety Board investigator reviewed transcripts of radio communications between San Jose airport's ground controller and the pilots of both the Grumman and Global Express. At 1523:19, the ground controller cleared the Grumman to taxi to parking. At 1523:50, the ground controller cleared the Global Express to taxi behind the Grumman. At 1524:24, the Global Express called the ground controller indicating that the Grumman had lost control. At 1524:27, the Grumman announced that he experienced jet blast from the Global Express, and had not realized the jet was spooling up. The Global Express was parked about 100 yards to the east of the tower, with nothing impeding line of sight between the two. The San Jose Jet Center ramp, where the Global Express was parked, is considered a nonmovement area. The airplane encountered jet blast from a executive jet transport Bombardier BD-700 Global Express, while taxing to parking. After making an uneventful landing, the pilot taxied off the runway and established communications with ground control. The controller cleared him to taxi to his requested destination, and about 30 seconds later the Global Express jet, which was parked on a FBO ramp with its tail pointed to the taxiway, called ground control and said they were ready to taxi. The ground controller cleared the Global Express to taxi behind the Grumman to the active runway. As the Grumman taxied past the Global Express' parking spot, the jet's engines began to spool up, resulting in a jet blast toward the right side of the Grumman. The Grumman swerved uncontrollably, and the left axle sheared off. The controller did not advise the Grumman of the potential jet blast hazard he could encounter while taxiing behind the Global Express. The Global Express was parked about 100 yards to the east of the tower with nothing impeding line of sight between the two. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2004_LAX04LA184.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Search this event elsewhere
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Related research
Matched on aircraft type or causal vocabulary (wake turbulence, turbulence). All research papers
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence minimization by aerodynamic means
The paper reviews NASA's efforts on wake vortex turbulence minimization by aerodynamic design or retrofit modifications to large transport aircraft.
- NASA NTRS 2019 · Conference Paper Wake Turbulence Mitigation for Arrivals (WTMA)
The preliminary Wake Turbulence Mitigation for Arrivals (WTMA) concept of operations is described in this paper. The WTMA concept provides further detail to work initiated by the Wake Vortex Avoidance…
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence avoidance
Aircraft wake turbulence /trailing vortex systems/ avoidance during flight, describing procedures for pilots and tower operators
- NASA NTRS 2019 · Conference Paper Aircraft wake turbulence progress and plans
Aircraft wake turbulence and trailing vortices, investigating physical characteristics, hazard potential and avoidance techniques
- SKYbrary (Eurocontrol) 2023 · SKYbrary article Wake Vortex Turbulence — SKYbrary Knowledge Base
SKYbrary wake vortex turbulence comprehensive article — generation mechanics, dissipation factors, separation standards (ICAO LIGHT/MEDIUM/HEAVY/SUPER + recategorisation RECAT-EU).
- NASA NTRS 2019 · Contractor Report (CR) An Examination of Aviation Accidents Associated with Turbulence, Wind Shear and Thunderstorm
The focal point of the study reported here was the definition and examination of turbulence, wind shear and thunderstorm in relation to aviation accidents.