DECLASSIFIEDUSAF PROJECT BLUE BOOK · NARA T-1206
UNITED STATES AIR FORCE
PROJECT BLUE BOOK
UNIDENTIFIED FLYING OBJECT CASE FILES · 1947 – 1969
CASE REFERENCE6313121
DATE OF SIGHTINGApril 1952
REPORTED LOCATIONJAPAN
FRAMES8
Machine transcription · mean legibility 53.6/100 ·
engines: tesseract-200dpi
Transcribed Frames
FRAME 001 / 008tesseract-200dpi
PROJECT 10073 RECORD CARD .
Lore” )2. LOCATION 12. CONCLUSIONS
* QO Was Balloon
18 Apr 92 JAPAN O Probably Balloon
3. DATE-TIvE GROUP [4 TYPE OF OBSERVATION — fn Teen Seren
LIC TR 10 Wos Aircraft
Local. cae x? aretenane mene 0 Ground: NIG D Ground-Radaer 0) Probably Aircroft
out__.__..1.} 1207F _’ D Air Vi sol D Air-Intercept Radar | Possibly Aircrofe
3 re tn Pe * 6. SOURCE a Qn a kg pestle
0 Yes i iy ; . 0 robobly Astronamical
0 No Det fel, 618 ACEM Sydn QO Possibly Astronomical
7. LENGTH OF OBSERVATION “|®. NUMBER OF OBJECTS | 9. COURSE a) 2. a
, . QO Insufficient Data for Evaluation
; 1 J Unknown
eninge - —. a oe ees eee) mingled
10. BRIEF SUMMARY OF SIGHTING ; 11. COMMENTS ' t
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' “ATIC FORM 329 (REV 26 SEP 52) .FRAME 002 / 008tesseract-200dpi
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Electronic's opinion:
Due to the short duration of this target, an acceptable explanation
of the target is impossible,
Capt Janes
FRAME 003 / 008POOR LEGIBILITY — PENDING RE-EXAMINATION
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AIR INTELLIGENCE INFORMATION REPORT
FUXCBRPT
AMER PEROMIPOON FROM (A gency) ae
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DATE OF Kim me DATE OF INFOWM ATION
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eae Ss | _18 April 1952
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PHEPARED BY (Opicer) aa OPO
ALLSI ¢, DUVASH, Major, USAF. Dot g2l, 61th ACe¥ Sqda, JAD
HLFERENCTS (Comical sembe?, di
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ertita, out repert, ee., ax appdicabls)
APD AICs 5. dta.29 Anril 1952. _ ea a oe
AMAAY: Cloehet conceive at inmary: frep: ort, Give stynlfcance in frol one entence parayraph DA inclowaera ad tower loft legen fect af repo 50 ane AF Form 1ia—-Dort 12)
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This coeport contains information concerning the sighting of an
unidantified a ya objact by a radar observer at Detach ant #2 » Seth.
Aixcraft Control and Warning Sgvadron, Japan Air Defenses Forca ont]5
frril | 1952, ¢ ie
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APPROVED:
On| pupae!
‘Sun RLES XY, BAT.
or eave gadigz a benerals USAP
I (LAL A 4 [Deputy for Intallizence
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1a Drawing of track on scops
2, Report of unidentified aircraft OWNGRADED AT 2 YRAR Ar
DECUASSIFIAD APTIR eee 4
DOD DIR 5200.74 )
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OISTRIBUTION BY OAGINATOR a
USAF ey 1 PEAT File cy 5 IN~eRAQ cy 12
ATIC tieP AFB, ATTNs ATIAAw20 cy 2 Hq FU cys 6,7, & B INeEVAL cy 12
LAC cy 3 Cor IAVYE cy 9
RVs Oat! ke) oe D/L JADZ on 10. i ees ee
M27 > NE NT CONTAINS INFORMATION ASPECT "ae THE NAS NA) DEFENSE OF THE NTIS STAIFR ai eT MEAN OF Tite ESHION 456 ANI ro
31 4N9 22 AS AMENDED ITS TITANSMISOIUN O8 Litt Nhy. LA “1 4 Or TTS CONTENTS Ue ANY MANNE TO AN lina leat PERSON 1S PROMISED OY
IT MAY NOT BE REPRODUCED) IM WHOLE OH IN PART, BY OFNCH Typ UMITOD StAytes allt FORCE Atte EXCLIT BY PERMIO3SION | rrEé Tor
i LLIGENCE, WISAP.
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FRAME 004 / 008tesseract-200dpi
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AF FORM HLPART
APPROVED | JUNE 48 >
REPORT NO.
Ie 20-52 |
PAGE 1 “or
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the following is suomitted in compliance with parasraph 7d, AYL 200-5
Gated 29 “pee 19523 .
‘1s: D = 9 : The size of the {object ("bizo") as it aonsared
ca the Plan 12 Indicator was 5 appreaciataly 5 to $ dagress tn length aad } to 1
mile 3a width,.. The Plan 12 TIndieater was gat for 4-450 mile savean with no
delay. <Zstimated speed of the object was 2700 milas per hour, Tha brightnsas
of the objact vss normal.
—— es —eeese et” mee ©
me oa of Sigh s The object first appeared at 1207-T and faded
from the agope at 1209-[,
ze , otagazce Chsarzation: The siznting was mada om TPS-13 tyne radar
The transmitted signal was 1273.5 megacysles., The pulse revetition rate was
approxinmataly 203 pulsas per second, Tha pulse width was 4 microssconis,
The range was set for a sixty mile swaap with no dalay, Tha anount of ses
acd ground return ware normal, Sinca tha objesat appeared for only tyo alimtes
on the scope, maintenance man ware not able ta pags aged check the set for
wallunction, bowever tha ; otc shane and location of the atho wers such that
gat brovbla asened to bes very resote, Set was operating norzally bafora and
atter the ineidant.
Be Blactronis Datat The objact was observed on the Plan 12 a
‘os be Logat 0b ars: Tha esographic coordinates of Datachment 21,
618th AC&i# Squadron ars 1a6e312/54919 18, Heading of tha odjast vaa 002°
until it reached 129951'T/34419'N, At this pos ition it assuaed a heading
3? accroximately 310° Neg held this heading until 1t reached 129992'2/34°70'™,
At tals point the object assumed a heading of 220° until it faded from tha
seopa.. Jo information can accurately be given in rezard to the altituda of
the objeet, since the radar set has naver heen caltbrat> od. Tt is baliaved
that coverages in this particular area is sing at high altitudas, vossibly
dua to mountainous tarraia a short distance from the antenn 14, when pointing
in the direction the objact was obsarved. |
5. Palisbiltzty of the Shserver: The radar orerator who mde this
observation is considered reliable and has had six months exnertence in his
presant position,
%, Factors Seariaz on Patina stad ates: biitty of the Sivhbingss
The area la waieh baa objact appesred is not: haavy trafete rea, howaver |
iat sireratt hava deen plotted in this area tn tha past. one of the aire
craft sigated havea travelled at a spead whieh wowld be considered irregular,
6, Veabhar Conditions: Wsathar In general was fair and sea condition
was calm, Visibility was «ovroxinately 5 miles, with hase,
DOWNGRADED AT 3 YRAR INTERV «AT::-
DECLASSIFIED AFTER 12 YEALs.
DOD DIR 5200.19
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UNCLASSIFIED
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1. 00S OCU MENT CONT AING (NFCA MATION APSECTING [THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE ACT. WU S.C K
Nh AnD 2 MA AMPNGED 11S TRANSMISSION OR THE HEVELATION GF LTS CONTENTS IN ANY MANNe TO AN UNAUTPORITED PERSON 15 PROM BITED BY LAW,
) a OOT 1 PEPPGDLUCED IN WHOLE OR IN PART, UY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EXCEPT YY PEP MISSION OF THE DIRECTOR OF
inves Liahew "Ae, uaa
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-FRAME 005 / 008POOR LEGIBILITY — PENDING RE-EXAMINATION
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ORM 2 ¥ ” HI | ty ( | UN CLASSIF eH ( 4
Ar F IA oe een amee re he WA
A oPROVED | JUNE 148 (CLAASSEN ATION) - |
AIR INTELLIGENCE INFORMATION REPORT |
© 084 Cligeney)
; WL Y . me , ae ee iRe@2 20052 PAGE a OF 2 PAGES ;
Jee 26 6 oO eee —* + ee. - ee 8 eS Oe a Cee Cee EE 1S EE i ee ate &
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7, Wousual Cosditions which nicht accouat for the Sichbings: one, |
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&, Existents of Physical Svidenca: None,
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/ DOWNGRADED AT 8S YEAR CNTR RIV ALAS
: HECLAS SSIFIED ie TEER 12 YEARS.
; Do w Din - 5500-40
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> iS OOCUMENT CONTAINS HIFORMATION AFFECTING THE NATIONAL DEFENSE OF THE UNITED STATES WITHIN THE MEANING OF THE ESPIONAGE c<T.OuSs ec
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2) AND 2, AS AMENDED. 17S TRANSMISSION OR THE REVELATION OF ITS CONTENTS IN ANY MANNER 10 AN UNAUTHORIZED PERSON 15 PHOMIBITED 4Y 1
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iT MAY NOY @E REPRODUCED IN WROLE OR IN PART, GY OTHER THAN UNITED STATES AIR FORCE AGENCIES, EACEPT Y PERMISSION OF THE 5 NRECTON OF
IN TLLASEACE, USAF UNCLASSIFIED
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CLASSiFICaTiOs) th Bahl owse
7? 6US MIVERN me NT PATTING COR ICS Peed > 4haule
FRAME 006 / 008tesseract-200dpi
UNG “SSIFIED ,
AIR DEFENSE OPERATIONS CENTER
REPORT OF UNIDENTIFIED AIRCRAFT all
pate +6 April 52
ADCGC TRACK, GEOREF TIME NO. OF A/G SPEED(MPH) SITE NO.
NO, COORDINATES
eel
—_——_— —
Ttauvke WIRE 5002
“Pm er en
HWS Ja.
WK 5229
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WIKE 1525
WIxE |42%
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DOWNGRADED AT 3 YEAR INTERVALS.
FADD ~ ~ DEC SISIED APTHER 12 YEARS,
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T UNCLASSIFIED
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FRAME 007 / 008POOR LEGIBILITY — PENDING RE-EXAMINATION
270°
350°
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ACTUAL SIZE OF PIP AS{IT APPE ZARED ON
PLAN-12- INDICATOR
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BAR INTERVALS:
~cmeme DCLASSILIED AFTER 12 YEAR
| DOD DIR §200,19
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