PROJECT BLUE BOOK

UNIDENTIFIED FLYING OBJECT CASE FILES · 1947 – 1969

CASE REFERENCE7008598

DATE OF SIGHTINGAugust 1951

REPORTED LOCATIONLarson AFB Washington

FRAMES8

→ Original microfilm scan (PDF) → Return to index

Machine transcription · mean legibility 63.8/100 · engines: tesseract-200dpi

Transcribed Frames

FRAME 001 / 008tesseract-200dpi

PROJECT 10073 RECORD CARD

1. DATE
26 Aug 51

-OCATION

Larson AFB, Wa

3. DATE-TIME GROUP

Lecel

our. 26/16282
Ss. PHOTOS

O Yes
G Ne

7. LENGTH OF OBSERVATION

8 Min
10, BRIEF SUMMARY OF SIGHTING

Speed 950mph. Object tracked continuously for

4. TYPE OF OBSERVATION

0D Ground- Vi svol
D Air Visual

2. CONCLUSIONS

-

Wos Balloon
Probably Balloon
Possibly Balloon

Wos Aircraft
Probably Aircroft
Possibly Aircraft

& Ground-Rodar

OD Air-intercept Radar

° OU RC

Military
8. NUMBER OF OBJECTS

1

a period of six minutes. Object was on a
course of 340 deg with only slight deviations

were airborne. Visual search

at time of sighting.

ATIC FORM 329 (REV 26 SEP 52)

enroute. Alt 13,000 ft but accuracy of measure
ment questionable due to brief length time the
object was detected, F-86 scrambled but radar
contact with the object was lost before a/c

conducted with

negative results. Weather conditions were not
favorable for anomalous microwave propogation

Was Astronomicel
Probobly Astronomical
Posalbly Astronomical

=a

ooo ooo ooo

Se

9. COURSE & other_Flec Interferenc
0 Insufficient Date for Evaluction
0 Unknown

11. COMMENTS a = at

Review of this incident by the Electroniks
Section of ATIC concludes that the retu
was possibly due to interference. This

was concluded becuase of the apparent

path of the object, directly approachin
the station, and the fact that the

target was observed on only the low

| beam of the AN/OPS=] radar set.

FRAME 002 / 008tesseract-200dpi

eS

SECRET |
—— By Auth of CO 637th |
SSS. Indts jum Dates 24 Ay v//
637TH AIRCRAFT CONTROL AND WARNING SQUADRON ¥]
162D AIRCRAFT CONTROL AND WARNING GROUP 4 ,
Larsoa Air Force Base i ae
Moses Lake, Washingten +0" ~<a .
DET-1- ACW-37 j - 5 30 august 1951

SUBJECT: Repert of Unconventional Object

TO: Cemmanding General
Air Materiel Command
Wright-Patterson AFB
Dayton, Chio
ATTN: MCIS

The attached dir Intelligence Information Report is submitted in
compliance with Air Defense Command Letter 200-1] dated 11 April 1951.

bile: bi

Captain
Commanding

2 Incls
Incl 1 - AFP Fors ll
Ino] 2 = AF Form ll

NA
aa
+
oo

DISTRIBUTICN s

1 copy CG, ADC, Attn: DI
1 copy CG, 25ADIV
1 copy CO, 162d AC&H Gp

ED AT 8 YEAR INTE IRVALS;
SIFIED AFTER 12 YEARS.

FE-CMLE-L

FRAME 003 / 008POOR LEGIBILITY — PENDING RE-EXAMINATION

ee

——-. —et* * eee —_—_-_———— - - a ae
A
A

AF FORM [12--PARTI

APPPOVED 1 JUNE 1948

ro ; LEAVE HULANK)
United States an et Sa De
ES" AiR. INTELLIGENCE INFORMATION REPORT

—_ — —_ “2

pn Ie:
SMe

~ ewe ee - —— —-— —-< _ — + a —_

; /
Report of Unconventional Cbhject
nth RE PORTEOGN = | FROM (Agency) Detachment 1 ‘ oe :
"5th ‘ix Givision - _ Subsector C —- 637¢h Airereats Cont. rol & Warning Sa
in VE OF PevORT DATE OF INFORMATION ae ate . EVAWATION , ? "|
» August 1951 26 August 1951
} -c2P aE BY (Ofleer) SCURCE = <- s = = "2A pee Pa ge
= rapt ain Erneat W. Rees Radar
i "SFEMENCES (Comtrod number, directive, previous report, ae., 1s applalie) a oe . a. ae = 4 :
| Air Detense Command Letter 200~1 dated 11 April 1951 oe eee, ee eee ee
| Sumwany: ( Snter concise summary of report, Give significance ia final onesentence paragraph. List inclosures at lower left. Gevin text of report os AS Form it—J et J)
as
| :
t 1. An unidentified flying object was detected by radar sited at Laraor
| Ale Pores Basa, Washington, and tracked continuously for a period of six (5) |
: minutes, The object traveled approvinately ninsaty-five (95) miles during this ;
seriod for an average ground speed of 946 miles per hour. No reliable altitude
; nformation was obtained. Size or somposition could not de debermined. Scranble
+ action was taken and a search conducted with negative results.
,
' : :
; 2, Present active Air Defense equipment is not capable of scoping with

tergets of this nature,in the opinion of the reporting officer,

ths PsT _ a

—- eo eo ~~ <— ~~ eee ee

— = = ha eS ST HF See eee ate
———_—“ «

* 26+ «*tem Oe

=~

Sy) SS

_—- > se RSE SY Se — ~ eyo

4 ‘ NATOR —,
r : wit? a!
: oe ’ G» fe iaveTr..@. ' y n*) . ~ we 4 d ;
, ’ - 4. ‘ . ;
; LW ov us isd y 4
*
; fc 4
«st %
> oo _— LL em —-e ete ee © Oe ~ ~~ ee. «= —aee eee - a - — -
‘ {TAIN ! 4 AFFECTING THe N OF 5TA

FRAME 004 / 008POOR LEGIBILITY — PENDING RE-EXAMINATION

.
‘
‘
.
er 4 o -
2 . o—_ p a :
7 ” 7
~ A -
i) ; SADT 39
; “7 ti 5 :
A ey wey
’ 44
j v : :
;
oan | q yu Pe bd, a= rx, . ; "3° p ™
’ -; Tt oy 4 7! 4 : , ‘ y=
; : | ik : Ke ~~ j es
1 2 Baw bee hee) “ee ee we ow _ = FF | ; 7 53 —— . ’
— ee Pee ere ens = © ws eo ae ee ee Ee " " —— — —_— —
' 7
; ‘ ~s/ | PPEMOPT Ni ;
o '
' » hw ’ ;
] i :
. ;
. r : ve J LMAis > | ;
' *
| Yor 92 ,
:
|
-
; : ’ 3 ‘ .
’ " . » 2
. is bs J 4 > w
‘
. ’ .
- ; :
> » - :
°
: ;
: “7 , : ;
> & a | ; ;i* é : KM . ob :
'
.
. + -4 . .
ars ae » aA awe > ‘ 4 vw Jos ; +. i" ’
. . * « . "
’ ‘ | “ . . | ‘ > % 9 + . '
. - + ’
_. > ~- J3' -3U Vas we - | wl ba 7 om .
4 . ; . . ‘ . sano > ;
- - 5 ” ans " . ,
wervyaciOon WAS acce plasaea 1200 se 4 - -
- : . . . " Wms . . i
. "rT . mat : : : )
i 94S , be ~ > 1 3A ’ - a OW 1 . bd . :
,
~ — . . . r .
- a - . | ~~
’ ~» JE oe i; Lt " , . '
.
- _* . ‘ :
- - ~ . => : : : . , : : - . a 4
LVS > Biase INC ; 2 r|
» te . . - ;
| sneaons*-« As
. 2 tee na , X i. «4 “
: :
‘
- ~ 44 ’ :
, ; *
a . uals, 2° 4 "> " .
ae) > v bot 4 4 ; : » Fe S | — .
4 “ _ -— . x " - |
; =’. @ 4 ' a ~ - ’ : - -; J : .
~s a ta
: iw ’ = ‘4 ; + , ”" , ‘
° ey ie ‘ ; a2 ’ ; >
4 ; ’ - _
; . -
———, " "
’ / =, ,
|
.
; . | ’
;
|
; :
) 4
: |
;
P * al
;
‘
,
.
; ‘
/
:

FRAME 005 / 008tesseract-200dpi

_ UNCLASSIFIED

\ 3. ET
AUTH: W, ATIC
BY: Lt Col N.R.Rosengarten
DATE: 5 Sep 51 —
Mir Technical Intelligence Cehter 0513302
Wright-Patterson ir Force Base, Dayton, Ohio
PRIORITY
Commanding Officer
Larson Air Force Base
Moses Lake, Washington p » oa

DET~1--ACW=37
For Detachment 1, 637th Aircraft Control and arning Squa¢cron, 162D Aircraft Control
and \ilarning Group, Captain William W, Sharp.

Reference your radar sighting of 26 August 1951, please advise immediately
whether weather conditions prevalent in your area at that time favor the phenomena
of anomalous micro wave propagation which results in spurious target signals,
Particularly, was there a temperature inversion and/or slatemare surkabiion with

altitude; what was the approximate shape of radar target;:return; are photographs of
the target returm available,

COORDINATION:
ATIAA
ATIA
DOWNGRADED AT 3 YEAR INTERVALS;
DECLASSIFIED AFTER 12 YEARS
DOD DIR 5200.10
51S—12628h—C -7
1 1
Lt J./.Cumings MURRAH S. STURGIS, Capt, USAP
‘TAA=2A 52270

UNCLASSIFIED

FRAME 006 / 008tesseract-200dpi

bs ie : c NUT REQUIRED sce pc
( FORE DECLASSIFYING » SEE RYE, CENTER

PRIORITY — Coy,

“GR 28 08 SEPT 5%

‘ ; « xy’
: ; 17 y +77 eG $F
cop pS A fe | i
C= SECRET PRIORETY te: bry. T.NeY

FROM LARSEN AFB “OSES LAKE WAS a

) “+? ety 2 ' bi: &

TO AMC UPAFS DAYTON CHIO : a ST ar
DET 1-ACU~37 SPACE 1089 REF UR ‘“ESG DTG\ AT 7086 FR ATSC.

WEECCOND AT TIME OF SIGHTING DID NOT FAVOR ANOMALOUS MICRO WAVE
PROPAGATION. NO TEP INVERSION WAS RED AND LOW MOISTURE CONTENT WAS
PRESENT AT TIME OF sicurinc APPROX SNAPE TGT WAS
NATHER LARGE IRREGULAR SHAPED SLIP/NOT ROUND OR ELONGATED/ NC PHOTO

-

‘F TGT-PET ARE AVAL ab
eS

ah Je $b- SIS TEC 284 A)

C1$-/26 2D

DOWNGRADED AT 3 YEAR INTERVALS;

SL f DECLASSIFIED AFTE ry
PF 0 La ALT ancenssiieo_ ie bin sana
gemme TN Corr

——_
——

FRAME 007 / 008tesseract-200dpi

On 2 g t >
bs an AN/Cv5~<4 and AN/CPS-1 radar sets, ‘The sbiee* wos treeke> eontimiorrl
for a serio? of six minutes and maje a tires crouné snecc of
object was on a course of [40° with only slirh : |
reviing of 12,000 feet wes obdtaines but the eesuruoy of tie rer surenent
cnuestionabic due to t the ;

The 7-36 cfreraft were sceranblec but ridar contact with she obfeat :

An-endix ili

LARSON AFE, JASHINGTON ~ 26 Ausust 194]

Ausust 1961 at 0236 2ST, an uniiortitic' fisin- olgeet was “ctect

‘s

srief lenrth of

_—

19st before the eircraft wore airtorne, A visual seeren wes confucted frm
*-
v5

17,900 to 25,000 fect with nerative resmul

The o-ervtor of the radar set, an air rorey Savtnin, is eonsidere’! to
be an exnert overstor.

eather

earth

> —

ee

ior conditions ut the tine of siehtin~ vere not fuvor:tis for ano

~ wis
+ i

malous ~icrovare oroavov7es tion.

Status of Investiration

Review of this incident by the -lectronics section of ATIC concludes

Cau

@ of the annarent nath of the object, directly ann:
ani tha fact tnat the tarrcet wes observed on only the lor
radar set,

‘one nine the agers:
w beam of the aAN/oc: oS)

that the return was nossibly due to interference, “Unis wus coneluded be-
c

DOWNGRADED AT 3 YEAR INTERVALS;
DECLASSIFIED AFTER 12 YEARS,
DOD DIR 5200.10

— . — ny

eae Geese —
hae Sa aS

8

FRAME 008 / 008tesseract-200dpi

ame ‘ UNCLASSIFIED.

Anventix III

- 26 Aurust 1941

: - oN GAS LNT UN

On 26 Aurust 1952 at ©2326 Vol, an untientiffc' flyin- object was céctec*to3
by wn AOE and AN/CPS-1 radar sets, The object was trackod corntinuoisly
for a verio? of six rimites cand mate a times eroun? sneci of 950 rv~h, The

object was on a course of 540? with only siicht deviations enroute. An <
readine of 17,000 feet wis of *ninet but th astsieyz of the me-sirenen® isc
Guestionable due to brief lenrin of tine the object wes deteetel, °*

The Syed circraft were scrasblec tut ridar contact with “he oljJect ~es
loss before the airemifs were airborno, A visuc. scare: wes conjucted from
17, 900 to 5,000 fect with nerutive results.

The onerator of the raver set, an air Force Cantein, is consicoret to
te an exmert overator.

weather

reathor conditions et the tine of sightince were not favorable for ano
malous ~icrowave pronovation.

Status of Investiration

Review of this inciden* by the Slectronics section of ATIC conclutes
that the return was vocsibly cue to in*erference, ‘this was concluded te-
cause of the annaren*® neath of the object, directiy anrroacnin= the station,
ani the fact thet the tareet was observed on only the low bean of the a%/3?S-1
radar set,

UNC
LASSIFIED arc

.
4 .
: . 1 ° ;
- SE ee re ee © - oe = oe tee , ‘yj ° ,
- "8 4 ied . ° al .
.

x - i.
-_ — oes me

ass
2 t 2 {we