Kenju Terauchi
Captain Terauchi reported seeing unusual lights and a large object during JAL Flight 1628 over Alaska.
Who This Witness Was
Kenju Terauchi was captain of Japan Air Lines cargo Flight 1628, a Boeing 747 operating over Alaska on 17 November 1986.
First Officer Takanori Tamefuji and Flight Engineer Yoshio Tsukuba were also on the flight deck.
Terauchi initiated the report and supplied the most detailed account. His real-time contact with Anchorage air-traffic control created a strong operational record.
He was a direct witness to what he perceived from the cockpit. He did not personally operate the FAA and military ground-radar systems later cited in the case.
What Is Attributable to This Witness
Terauchi reported several phases:
- bright yellow, amber or white lights;
- two apparent objects ahead and to one side;
- rectangular or grid-like luminous areas;
- movement that appeared to keep pace with the aircraft;
- intense brightness and a possible sensation of heat.
- a very large dark object behind or near the aircraft;
- an outline or mass inferred against the night sky;
- dimensions compared in later accounts with an aircraft carrier or multiple aircraft;
- continued presence during requested course changes.
- a return on the aircraft's weather radar;
- reporting the traffic to Anchorage control;
- requesting or accepting heading changes;
- continued concern until the lights were lost.
These claims should remain attributed to Terauchi unless Tamefuji or Tsukuba independently confirmed the same detail.
How the Account Entered the Record
The report entered the record in real time through radio communication with Anchorage Air Route Traffic Control Center.
FAA investigators interviewed the crew and collected:
- communications records;
- radar-related material;
- crew statements and sketches;
- operational correspondence;
- press material.
The US National Archives holds the FAA record collection under identifier 733667.
The FAA completed its investigation and stated that it could not confirm the reported event through its systems.
Terauchi later gave press interviews and wrote a detailed account. Public summaries often combine his later narrative with disputed radar interpretations.
Evidence Analysis
Directness and Access
Terauchi was a direct visual witness and aircraft commander.
His evidence is strong for:
- the occurrence of a genuine cockpit report;
- his own visual impressions;
- the sequence of heading changes;
- the crew's concern;
- the fact that he believed unidentified traffic was near the aircraft.
It is weaker for:
- physical range;
- object dimensions;
- the identity of ground-radar returns;
- the large object's solidity;
- the relationship between all visual phases.
Relevant Expertise
Commercial command experience is relevant to:
- recognition of normal aircraft;
- navigation lights;
- collision hazards;
- cockpit reflections;
- aircraft movement;
- operational reporting.
It does not remove the difficulties of:
- night-time depth perception;
- bright planets;
- atmospheric distortion;
- ice-crystal effects;
- reflections through multi-pane cockpit windows;
- weather-radar interpretation.
Supporting Crew
Tamefuji and Tsukuba support the presence of unusual lights.
Their accounts were less extensive than Terauchi's. They did not clearly duplicate the complete aircraft-carrier-sized object description.
This evidential pattern supports:
- a genuine shared light observation;
- a more individual interpretation of the giant-object phase.
Initial Lights
Two luminous sources could represent:
- aircraft;
- planets;
- reflections;
- atmospheric optical effects;
- physical unknown objects.
The grid or panel impression may arise from:
- actual structured lighting;
- diffraction;
- ice crystals;
- cockpit-window reflections;
- glare broken by window framing;
- perceptual organisation.
No photograph preserves the appearance.
Jupiter and Mars
Jupiter and Mars were visible in the general region of the initial observation.
Bright planets can:
- appear unusually luminous in clear cold air;
- scintillate;
- show colour;
- seem to move when the aircraft turns;
- remain at a similar relative bearing;
- be doubled or distorted by ice crystals and window optics.
A planet-based explanation is strongest for persistent distant lights. It is weaker if the claimed rapid relative motion and close pacing are accepted literally.
Ice Crystals and Atmospheric Optics
High-latitude flight conditions can produce:
- halos;
- parhelia;
- reflections;
- light pillars;
- multiple images;
- unusual brightness through ice.
No complete meteorological reconstruction has demonstrated the exact effect reported.
Atmospheric optics remain a plausible contributor rather than a proved identification.
Cockpit Reflections
The 747 flight deck used layered windows and contained bright instrument lighting.
Reflections can:
- appear outside the aircraft;
- move with observer position;
- duplicate lights;
- create a grid-like form;
- disappear with a change in viewing angle.
The crew reportedly viewed the lights from more than one position and direction, which weakens a single fixed reflection explanation. Several optical effects could still have contributed.
The Large Object
The giant dark object is the least independently supported major claim.
Its dimensions depended on assumed range and comparison with the aircraft.
At night, a dark area can be inferred from:
- absence of stars;
- cloud;
- darkness between lights;
- cockpit reflections;
- expectation after a prolonged alert;
- an actual unlit object.
Other crew members and nearby aircraft did not clearly confirm a carrier-sized body.
Onboard Weather Radar
Terauchi reported an aircraft-radar target.
Weather radar is designed primarily to detect precipitation and reflective atmospheric structures.
Possible returns include:
- cloud and ice;
- ground clutter;
- anomalous propagation;
- system artefact;
- another aircraft;
- a physical unidentified target.
No saved display or raw data permits independent analysis.
Ground Radar
FAA review did not establish a continuous independent target matching the visual event.
An apparent secondary return was interpreted as a split or duplicated return associated with JAL 1628. Other military or primary returns were intermittent and ambiguous.
The radar record supports official investigation and uncertainty, not a confirmed giant craft.
Other Aircraft
A United Airlines aircraft and an Air Force C-130 were asked to look for the object.
Their crews did not confirm a large object near JAL 1628.
Negative observation is limited by:
- distance;
- viewing angle;
- timing;
- cloud;
- object visibility.
It is significant evidence against a persistent, extremely large and brightly illuminated craft.
Previous Reports and Interpretive Confidence
Terauchi had reported other unusual aerial observations and adopted a confident extraordinary interpretation.
Prior interest does not make the report false. It may affect:
- recognition thresholds;
- terminology;
- confidence;
- interpretation of ambiguous lights.
The assessment should rely on the event data rather than personality arguments.
FAA Treatment
The FAA treated the report as a genuine aviation matter and investigated it.
The agency's inability to confirm the target does not show that Terauchi fabricated the experience. It means that the available sensor evidence did not verify his physical interpretation.
Alternative Interpretations
Bright planets with atmospheric and cockpit distortion
Strengths
- Jupiter and Mars were present.
- Explains persistent luminous sources.
- Ice and window optics can create colour and duplication.
- Supporting crew saw lights but not necessarily the giant craft.
- Ground radar did not confirm a continuous target.
Weaknesses
- Terauchi reported relative movement and pacing.
- Several crew members observed the lights.
- Does not reproduce every reported phase.
Conventional aircraft or military traffic
Strengths
- Aircraft lights can appear as paired sources.
- Night-time range is difficult.
- Military activity in Alaska was plausible.
- Relative motion can appear unusual.
Weaknesses
- Controllers did not identify matching traffic.
- The large-object claim is not explained.
- The encounter reportedly persisted during course changes.
Cockpit reflections and optical artefacts
Strengths
- Can create structured luminous panels.
- Multi-pane windows and instrument lights provide sources.
- Changes with observer position and heading.
- No external image exists.
Weaknesses
- More than one crew member saw the lights.
- The sources were reportedly viewed through different windows.
- A single reflection may not explain the full duration.
Mixed event involving celestial lights, optical effects and radar artefacts
Strengths
- Fits the varying evidence streams.
- Explains why the giant-object phase was not equally corroborated.
- Compatible with FAA conclusions.
- Accounts for nearby aircraft seeing nothing.
Weaknesses
- Requires more than one contributing cause.
- Exact reconstruction remains incomplete.
One or more genuinely unidentified physical objects
Strengths
- Experienced three-person flight crew.
- Real-time operational report.
- Prolonged observation.
- Course changes.
- Reported onboard radar indication.
Weaknesses
- No photograph.
- Giant object principally Terauchi's interpretation.
- No continuous independent radar.
- Other aircraft negative.
- Strong astronomical and optical alternatives.
What Is Established
- Terauchi made a genuine contemporaneous aviation report.
- Other crew members saw unusual lights.
- Anchorage control coordinated course changes and searches.
- The FAA conducted a formal investigation.
- Terauchi supplied the most detailed narrative.
- Ground radar did not establish a continuous separate target.
- Other aircraft did not confirm a giant object.
- No photograph or physical evidence exists.
What Is Not Established
- The distance and dimensions of the initial lights.
- A structured grid of physical thrusters.
- A carrier-sized object.
- A direct heat effect.
- A validated air-to-air weather-radar target.
- One continuous object through all phases.
- Extraordinary performance or non-human origin.
Overall Assessment
We assess Terauchi as a significant named aviation witness whose real-time report and professional experience deserve substantial weight.
The strongest proposition is that the crew saw unusual lights that they could not identify. The giant-object interpretation is less secure because it was not equally reproduced by the other crew members, was not confirmed by nearby aircraft and lacks a continuous radar track.
A mixed optical, astronomical and radar-artifact explanation is plausible. The public evidence does not establish a carrier-sized extraordinary craft.
Confidence by Proposition
- HighTerauchi sincerely made a genuine in-flight report.
- HighMore than one crew member saw unusual lights.
- ModerateOne or more physical airborne objects were present.
- LowA carrier-sized dark craft accompanied the 747.
- LowThe event displayed extraordinary controlled performance.
- Very lowTerauchi's evidence establishes non-human technology.
Sources
Official records, contemporary material, institutional archives and other cited research. Inclusion documents the record; it does not mean the publisher endorses every reported interpretation.
Associated Case Research
Other witnesses in the record
These links identify people or groups associated with the same case. Their accounts should be assessed independently before being treated as corroboration.