NTSB CAROL · Event
Event FTW97IA161
Aircraft involved
Probable cause & findings
The first officer's failure to maintain clearance while taxiing around a standing airplane.
Factual narrative
On April 20, 1997, at 1615 central daylight time, a Boeing 747-300 airplane, Dutch registration PHBUL, collided with another airplane while taxiing for takeoff at the Houston Intercontinental Airport, near Houston, Texas. The airplane was being operated by the Royal Dutch Airlines as KLM Flight 662 under Tittle 14 CFR Part 129, at the time of the incident. None of the 284 passengers, 10 flight attendants, or the 5 flight crewmembers were injured. Visual meteorological conditions prevailed for the scheduled international flight for which an IFR flight plan was filed. KLM Flight 662 was originating at the time of the incident, with Amsterdam, The Netherlands, at its intended destination. According to Air Traffic Control (ATC) personnel at the airport, an Air France Boeing 767 was number one in sequence for takeoff at the runup area for runway 14L. The Air France flight reported to ATC that they were not ready for takeoff; however, they did not state the reason for their delay. ATC asked KLM flight 662, which was number two for departure, if they were able to taxi around the Air France Boeing 767 which was standing on the right side of the KLM Boeing 747. The KLM crew answered that they were able to taxi around and they were subsequently cleared by ATC to taxi into position and hold for departure on 14L. The first officer of the KLM 747 stated that the flight crew was aware of the close clearance between the two wing tips and they "taxied slowly and cautiously" slightly to the left of the yellow taxi line. The first officer stated that he remarked "we were clear" as he watched out his window on the right side of the cockpit. A couple seconds after the "all clear" the crew reported that a "slight bump" was felt which they attributed to a bump on the taxiway. While taxiing around the standing Air France Boeing 767, the extended right outboard leading edge flap from the KLM 747 impacted the left wing tip of the Air France 767, resulting in minor damage to both airplanes. The flight crew of the Air France's 767 reported the collision to ATC by radio. Airport operations personnel reported that no fuel was spilled from either aircraft and both airplanes taxied back to their respective gates in the international ramp where all passengers were deplaned without further incident. Air France's maintenance personnel replaced the left wing navigation light assembly from the Boeing 767 and the airplane was released, departing Houston approximately 3 hours after the their scheduled departure time. Damage to the KLM Boeing 747 was limited to the leading edge of the outboard leading edge flap and the flap actuator. According to the FAA inspector at the site, the wing tip is visible from the first officer's station in the cockpit of the 747. Additionally, the FAA inspector reported that the side window was crazed. The scheduled departure time for KLM Flight 662 was 1540. The visibility at the time of the incident was reported in excess of 10 nautical miles without restrictions. An Air France Boeing 767 was number one in sequence for takeoff at the runup area for runway 14L. The Air France flight reported that they were not ready for takeoff. KLM flight 662 was cleared by ATC to taxi into position and hold for departure on 14L. While taxiing around the standing Air France 767, the extended right outboard leading edge flap from the KLM 747 impacted the left wing tip of the Air France 767, resulting in minor damage to both airplanes. Airport operations personnel reported that no fuel was spilled from either aircraft and both airplanes taxied back to their respective gates. Air France's maintenance personnel replaced the left wing navigation light assembly from the 767 and the airplane was released and departed approximately 3 hours after the intended departure time. According to the FAA inspector at the site, the wing tip is visible from the cockpit of the 747. Additionally, he stated that the side window was crazed. The scheduled departure time for KLM flight 662 was 1540. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1997_FTW97IA161.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (maintenance). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2026 · Journal article (IJAAA)
From Reactive to Predictive: A hybrid Trust-Mediated Adoption Framework for Data-Driven Maintenance in Distributed-Authority Aviation Environments
Modern aviation maintenance operates within increasingly data-intensive technological environments, yet the operational integration of predictive maintenance into routine decision-making remains incon…
- Semantic Scholar 2025 · Article (Applied Sciences)
Decision-Making Framework for Aviation Safety in Predictive Maintenance Strategies
The implementation of predictive maintenance (PM) in aviation presents unique challenges due to strict safety requirements, complex operational environments, and regulatory constraints.
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
Low-Resource Automatic Speech Recognition Domain Adaptation – A Case-Study in Aviation Maintenance
With timeliness and efficiency being critical in the aviation maintenance industry, the need has been growing for smart technological solutions that optimize and streamline the different underlying ta…
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
A New Trajectory in UAV Safety: Leveraging Reinforcement Learning for Distance Maintenance Under Wind Variations
In the field of aviation, safety is a critical cornerstone, and the operation of Unmanned Aerial Vehicle (UAV) systems is deeply connected with this principle.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Just Culture in Aviation: A Metaphorical Study on Aircraft Maintenance Students
Just Culture, a sub-dimension of safety culture, has been a prominent and debated topic in aviation safety in recent years.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Performance PRISM: A Comprehensive Framework For Performance Measurement In Aircraft Maintenance
Aircraft maintenance is governed by rigorous safety requirements and high operational complexity, demanding robust performance measurement frameworks to ensure optimal maintenance practices.
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