CORROBORATED
CF-GEI-20070701839 CORROBORATED

The Jazeneuil TCAS Phantom: Air France Radar Anomaly

CASE FILE — CF-GEI-20070701839 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2007-07-14
Location Reported location of the sighting or event
Jazeneuil, Vienne, France
Duration Estimated duration of the observed phenomenon
Several minutes
Object Type Classification of the observed object based on witness descriptions
unknown
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On July 14, 2007 at 14:35 UTC (Bastille Day), the flight crew of an Air France commercial flight reported a TCAS (Traffic Alert and Collision Avoidance System) alert indicating unknown traffic in dangerous proximity to their aircraft near Jazeneuil in the Vienne department. The onboard collision avoidance system displayed a red plot on the pilots' screens showing an object at 30 nautical miles (55 kilometers) distance and 300 feet (100 meters) above their aircraft. Despite exceptional visibility conditions, the pilots reported no visual confirmation of any object or aircraft in the indicated position. Ground-based air traffic control simultaneously monitored the airspace and detected no unknown traffic on their radar systems, creating a discrepancy between the aircraft's onboard systems and ground radar. The Bureau Enquête Analyse (BEA) at Le Bourget conducted a preliminary investigation for the DGAC (French civil aviation authority) and concluded the phenomenon was caused by false radar echoes. GEIPAN's technical expertise identified the probable source as a malfunction in the aircraft's TCAS system itself. This case represents a well-documented example of instrument malfunction creating a phantom radar contact. The combination of professional pilot witnesses, official investigation by multiple aviation authorities, and technical analysis of the aircraft systems provided clear evidence that this was an instrumentation issue rather than an actual aerial phenomenon. The GEIPAN classification 'B' indicates the case was explained with high probability.
02 Timeline of Events
14:35 UTC
TCAS Alert Triggered
Air France flight's Traffic Alert and Collision Avoidance System activates, displaying red plot indicating unknown traffic at 30 nautical miles distance and 300 feet above aircraft
14:35-14:40 UTC (estimated)
Visual Search Conducted
Flight crew conducts visual scan of airspace in direction indicated by TCAS. Despite exceptional visibility conditions, no object or aircraft observed
14:35-14:40 UTC (estimated)
Air Traffic Control Consulted
Ground-based air traffic control checks radar systems. No unknown traffic detected on ground radar in the indicated position
14:40 UTC (estimated)
Incident Reported
Flight commander files official report of TCAS anomaly with aviation authorities
Post-incident
BEA Preliminary Investigation
Bureau Enquête Analyse du Bourget conducts preliminary investigation for DGAC, concluding phenomenon was due to false radar echoes
Post-incident
GEIPAN Technical Analysis
GEIPAN experts analyze case, identifying probable malfunction of TCAS system. Case classified as 'B' (explained with high probability)
03 Key Witnesses
Air France Flight Commander
Commercial airline pilot
high
Commander of Air France commercial flight. Experienced professional pilot trained in aircraft systems and airspace management. Reported anomaly through proper official channels.
"Alert TCAS indicating traffic very close to the aircraft... red plot located at 30 nautical miles and 300 feet above the aircraft. No object was seen by the pilots despite exceptional visibility."
Air France Co-pilot
Commercial airline pilot
high
Second pilot on Air France flight. Corroborated TCAS alert observation and absence of visual contact.
04 Analyst Notes -- AI Processed
This case demonstrates excellent investigative protocol and cross-verification procedures. The credibility factors are exceptionally strong: commercial airline pilots are highly trained observers, the incident occurred during daylight with exceptional visibility, and the TCAS alert provided specific data (distance, altitude separation). However, the complete absence of visual confirmation despite optimal viewing conditions immediately raised red flags. The critical corroborating evidence came from air traffic control's failure to detect any corresponding radar return on independent ground-based systems. The technical analysis is compelling. TCAS systems are active transponder-based collision avoidance systems that interrogate nearby aircraft transponders. False returns can be generated by electromagnetic interference, system glitches, or signal reflections. The specificity of the false echo (precise distance and altitude data) suggests a coherent system malfunction rather than random noise. The timing on Bastille Day (French national holiday) is coincidental but worth noting - increased military air activity on this date could potentially have contributed to electromagnetic interference, though this is speculative. The BEA and GEIPAN investigations both independently concluded instrumentation failure, lending high confidence to this verdict.
05 Theory Comparison
BELIEVER ANALYSIS
Stealth Object Hypothesis
A small minority might speculate that the TCAS detected a real object with characteristics that made it invisible to ground radar and human observation - possibly a stealth aircraft or unknown aerial phenomenon. However, this theory contradicts the fundamental physics of how TCAS operates (requiring transponder responses) and is not supported by any physical evidence. The official technical analysis provides a far more parsimonious explanation.
SKEPTIC ANALYSIS
Electromagnetic Interference
The false TCAS return may have been caused by external electromagnetic interference rather than internal system failure. July 14th is Bastille Day in France, often featuring increased military aircraft activity including formation flights and demonstrations. Military radar systems or electronic countermeasures could have interfered with the civilian TCAS transponder interrogation system, creating a phantom return.
06 Verdict
ANALYST VERDICT
This case is almost certainly explained as a TCAS instrumentation malfunction producing false radar echoes. The evidence is conclusive: no visual confirmation despite excellent visibility, no ground radar corroboration, and expert technical analysis identifying probable system failure. The case holds moderate significance as a documented example of how sophisticated aviation systems can produce false anomalies, and demonstrates the importance of multi-source verification in investigating aerial phenomena. Confidence level: Very High (95%+). This case serves as a valuable example of professional investigation protocols and the critical importance of corroborating instrument readings with independent observations.
AI CONFIDENCE SCORE:
85%
07 Community Discussion
VIEW ALL >
// AUTHENTICATION REQUIRED
Sign in to contribute analysis on this case.
LOGIN
// NO COMMENTS YET
Be the first field agent to contribute analysis on this case.
08 Live Chat 1 ROOM
ENTER LIVE CHAT
Real-time discussion with other field agents analyzing this case.
OPEN LIVE CHAT 1
// SECURITY CLEARANCE NOTICE

This system uses cookies to maintain your session and operational preferences. Optional analytics cookies help us improve the archive. Privacy Policy