JAL flight crew
Other crew members on JAL 1628 provided supporting observations that broaden the case beyond the captain alone.
Who These Witnesses Were
This entry covers the other flight-deck crew members aboard Japan Air Lines Flight 1628 on 17 November 1986:
- First Officer Takanori Tamefuji;
- Flight Engineer Yoshio Tsukuba.
Captain Kenju Terauchi was the aircraft commander and supplied the most extensive and dramatic public narrative.
Tamefuji and Tsukuba are important because they establish that the event was not entirely a solitary perception. Their accounts were less extensive and should not be expanded to include every feature described by Terauchi.
What Is Attributable to This Witness Group
The surviving FAA and case summaries support that the other crew members:
- were present in the cockpit;
- became aware of unusual lights;
- saw bright or luminous objects in the same general period;
- participated in cockpit discussion;
- supported that the event was taken seriously;
- did not clearly reproduce every structural detail claimed by Terauchi;
- did not securely confirm an aircraft-carrier-sized trailing object.
Their direct evidence is strongest for the existence of unusual visual lights.
The following should remain attributed principally to Terauchi unless a separate crew statement supports them:
- detailed rectangular or grid-like light panels;
- heat on the face;
- a giant dark "mothership";
- carrier-scale dimensions;
- prolonged close formation with one enormous object;
- a definite non-conventional craft interpretation.
How the Accounts Entered the Record
The crew's observations entered the record through:
- real-time air-traffic communications;
- post-flight interviews;
- sketches;
- FAA investigative records;
- later press reporting.
The National Archives holds an extensive FAA collection relating to JAL 1628.
The archive supports that the FAA conducted a genuine aviation-safety investigation. It does not preserve a simple public set of three fully separate, time-stamped and equally detailed accounts for every phase.
Later media treatment often used Terauchi's account as the collective crew narrative.
Evidence Analysis
Directness and Cockpit Positions
Tamefuji and Tsukuba were direct visual witnesses to at least some lights.
Their opportunities differed:
- Tamefuji had a forward flight-deck position and active flying duties;
- Tsukuba's flight-engineer station had a different angle and workload;
- Terauchi first directed attention;
- the crew looked through different windows at different moments;
- aircraft turns changed the view.
A crew member can support the presence of lights without confirming another person's exact apparent structure.
Relevant Expertise
The crew were trained to recognise:
- routine aircraft traffic;
- navigation lights;
- cockpit reflections;
- collision hazards;
- normal weather radar behaviour;
- aviation communication procedures.
Experience strengthens the conclusion that the lights appeared unusual.
Night-time distance, atmospheric distortion and reflections remain difficult for trained crews, particularly in polar conditions with ice crystals and bright celestial objects near the horizon.
The Large Object
Terauchi later described a much larger object behind or alongside the 747.
The other crew members did not clearly confirm the carrier-scale object in the same detailed terms.
Possible reasons include:
- different viewing positions;
- the captain looking for longer;
- poorer visibility from another station;
- different interpretations of the same dark background;
- later narrative expansion by Terauchi.
The absence of clear independent confirmation materially lowers confidence in the giant-object claim.
Onboard Weather Radar
The crew reported an onboard radar indication.
Weather radar is designed to detect precipitation and atmospheric reflectivity, not to provide a validated air-to-air target solution.
A return can result from:
- ice crystals;
- cloud;
- ground clutter;
- anomalous propagation;
- system settings;
- a physical object;
- interpretation error.
The crew's report is operational evidence. It does not establish range and identity without the recorded display and technical data.
Ground Radar
FAA investigators concluded that the main apparent secondary ground target was consistent with a split or duplicated return from JAL 1628 itself. Military returns were intermittent and treated as clutter or uncorrelated.
The crew did not directly operate these systems. Ground-radar claims should be sourced to controllers and investigators.
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 unknown object accompanying JAL 1628.
Negative observation is not decisive because geometry and timing differed. It is important evidence against a persistent carrier-sized object visible over a wide area.
Jupiter, Mars and Atmospheric Distortion
Jupiter and Mars were visible in the general direction of the initial lights.
Bright planets can:
- scintillate;
- change colour;
- appear duplicated through ice crystals;
- seem to move during aircraft turns;
- remain in a consistent relative direction.
The hypothesis is stronger for the initial lights than for the later giant object, which may represent a separate perceptual interpretation of cloud, darkness or reflections.
No one optical reconstruction accounts securely for every detail.
Cockpit Reflections
Multi-pane cockpit windows can produce:
- ghost images;
- repeated lights;
- reflections of cockpit instruments;
- apparent motion as the observer changes position;
- enlarged or structured luminous patterns.
The crew reportedly viewed the lights from more than one window, which weakens a single fixed reflection explanation.
Reflections may still have contributed to parts of the event.
Crew Authority and Interpretation
Terauchi had previously reported unusual aerial phenomena and quickly interpreted the lights as unusual craft.
Predisposition does not show that he was wrong.
Captain authority may influence how uncertain colleagues describe a shared event. A cautious analysis should prioritise each crew member's own wording.
Alternative Interpretations
Bright planets distorted by atmosphere and cockpit optics
Strengths
- Jupiter and Mars were present in a relevant direction.
- Explains colour changes and apparent persistence.
- Ice crystals are common over Alaska.
- Cockpit windows can duplicate or distort lights.
- The supporting crew descriptions were less dramatic.
Weaknesses
- The crew reported apparent relative movement.
- More than one crew member saw the lights.
- No reconstruction reproduces every phase.
- Does not directly explain the onboard radar indication.
Conventional aircraft or distant traffic
Strengths
- Aircraft lights can appear in pairs.
- Relative motion at night is deceptive.
- Military traffic may not be immediately identified.
- Professional reporting can occur before identification.
Weaknesses
- Controllers did not identify matching traffic.
- The lights reportedly persisted near the aircraft.
- No conventional aircraft was confirmed.
A mixed event: celestial lights, radar artefacts and later perceptual interpretation
Strengths
- Separates evidence streams.
- Fits FAA radar conclusions.
- Explains why all crew saw lights but not all saw a giant object.
- Accounts for other aircraft seeing nothing.
- Does not require one cause for every phase.
Weaknesses
- More complex than a single-source account.
- Exact contribution of each stimulus remains uncertain.
One or more genuinely unidentified physical objects
Strengths
- Three professional crew members observed unusual lights.
- The report was contemporaneous.
- The event lasted long enough for controller coordination.
- An onboard radar return was reported.
Weaknesses
- No photograph.
- Ground radar did not establish a separate continuous target.
- Other aircraft did not confirm the large object.
- The dramatic structural interpretation depends mainly on Terauchi.
What Is Established
- Tamefuji and Tsukuba were present on the flight deck.
- They supported that unusual lights were seen.
- The crew made a genuine contemporaneous aviation report.
- Their descriptions were less extensive than Terauchi's.
- No complete independent ground-radar track was established.
- Other aircraft did not see the claimed giant object.
- No photograph or physical trace exists.
What Is Not Established
- Equal agreement on every object feature.
- A carrier-sized trailing craft.
- A structured vehicle visible to all three.
- Independent multi-radar tracking.
- Extraordinary manoeuvring.
- The technology or origin of the lights.
Overall Assessment
We assess the supporting JAL crew as meaningful corroboration that unusual lights were present and discussed during a genuine flight-safety event.
Their evidence does not independently validate Terauchi's full giant-object narrative. The secure shared account is narrower than the popular case summary.
A mixed interpretation involving celestial or atmospheric lights, optical effects and radar artefacts remains credible. The case remains unresolved at the light-source level, with low confidence in a carrier-sized craft.
Confidence by Proposition
- HighMore than one crew member saw unusual lights.
- HighThe flight generated a genuine contemporaneous report.
- ModerateThe lights were nearby physical airborne objects.
- LowThe supporting crew independently confirmed a giant trailing craft.
- LowThe event involved extraordinary performance.
- Very lowThe crew 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.