1. RADAR STATION NEAR BURGAS 2. DOSO AERO CLUB FLIGHT PATTERNS 3. AIRCRAFT 4. JET AIRCRAFT FLIGHTS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A003500740006-6
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 22, 2016
• Document Release Date: January 13, 2010
• Sequence Number: 6
• Publication Date: February 4, 1954
• Content Type: REPORT

Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
CENTRAL INTELLIGENCE AGENCY
INFORMATION REPORT
j%&r Stat r Burgas
CONFIDENTIAL/CONTROL-U.6. OFFICIALS ONLY
COUNTRY Bulgaria
SUBJECT 1. Radar Station near Burgas
2. DOSO Aero Club Flight Patterns
3. Aircraft
L_ Jet, Ai raf . Flivhte
6.
THE SOURCE EVALUATIONS IN THIS REPORT ARE DEFINITIVE.
THE APPRAISAL Of CONTENT IS TENTATIVE.
(FOR KEY SEE REVERSE)
1.
There were four 15 meter poles set four to
3?
4.
existence of a Soviet radar station located 7-8
kilometers northwest of urgae by Yordan Dobrev, Chief of the Burgas.DOSO
(Dobrovolna Organizatsiya za Mdeystrie na Otbranata; Voluntary Organization to
Facilitate the Defense) Aero Club.
which describes the location and appearance of this station .
(See Appendix A to this report
five meters apart and connected by antennae and various other wires. The site
was surrounded by barbed wire entanglements and there were vineyards on the
north and east sides.
and is manned by Soviets.
Flight Controls
I:e (N 42-37. E 27-
only permitted to fly over the airfield and Ba a villa
Tbfs3 pro;nent contains LafQribat10t4ffeptiasthe Ne
IAR1l 9pf'r se of fh. 4 i 5t*to.R._ Wlf a tae mesa-
frog of Title 18, Bectlotu 9q4, gt tt}e D.B. 990e,
amended. Its trinsmission o; rbvelbtlon of Its contenps
to or receipt by an unauthorised person 1s prohibited
by law. The reproduction of this form is prohibited.
DATE DISTR. 4 February 1954
NO. OF PAGES
REQUIREMENT
REFERENCES
25X1
25X1
the station belongs to 25X1
to approach or to fly over the site.
DOSO sponsored training flights from the Sarafovo Airfield near Burgas were
2L).
a coastal battery located on the Black ea
coast about three kilometers northeast of Sarafovo village. There is an un-
specified unit stationed between the sea and the Burgas-Pomorie road a
point. Both Army and Navy uniforms are worn by members of this unit.
flights were to be made only over authorized areas.
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ORLY
25X1
LJ I "' Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
 Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
5. When DOSO sponsored training flights are to be made from one airfield to
another, a request is sent to the Ministry of Defense two or three da s in
advance and the flizht is -not made until authorization is received,
The training planes (see below) are not equipped
6. Students pilots were taught to adhere to the following traffic patterns:
a. Take off - climb to 100 meters, 90 degree left hand turn, maintain altitude
until a point which is 45 degrees from the place where the take off was
begun, 90 degree left hand turn, climb until reaching 200 meters, enter
compass course; and
b. Landing - fly over the landing "T" at 250 meters, circle counter-clockwise
and land within a 25 x 25 meter square located 25 meters to the right of
the landing "T".
Aircraft
Tha -"LA7" +.vna manna (Qaa AnnanAiv R
are used by the DOSO as trainers at Dolna. Mitropoliya and since 1953 LJ~I
at Sarafovo airfields. They are used as light night bombers by Bulgarian 25X1
Air Force units based at the Yambol Airfield. The bodies of these planes which
are constructed of metal and wood are made at the airplane factory in Lovech.
The construction of a series of "LAZ" planes, designed by an engineer, Lazarov,
was started after 1944. The first series, consisting of five models was
unsuccessful as the win s asily sheared off. The present series is considered
v 25X1
tests were being made with the
purpose of mounting YAK-9p engines in these bodies. At that time, the "LAZ"
planes were equipped with 4-cylinder Czechoslovak "Watter" engines.
8. The "LAZ" planes have the following characteristics:1
a. Wings: about seven meter span, low tapered leading edge and straight
trailing edge, elliptical tips; slight dihedral angle "from the roots";
flaps, about 80 x 10-15 centimeters; trim tabs on the tail but not on the
wings; no slots; ailerons located near the center of the trailing edge;
b. Fuselage: about six meters overall, straight undercarriage; side-by-side
dual control; plexi-glass canopy;
c. Empennage: single fin and rudder; diamond-shaped horizontal stabilizer and
elevator;
d. Landing gear: tail wheel; tail wheel not retractable, landing wheels
retract towards fuselage; landing wheels in wings about 25-30 centimeters
from the fuselage; landing gear struts are about 40-50 centimeters long and
10 centimeters square with rounded corners; wheel about 10 centimeters in
diameter; tire about 40 centimeters in diameter; hydraulic shock absorbers;
and
e. Miscellaneous: airscoop on left beneath spinner; exhaust on right; heavy
machine gun mounted on right over cowling.
9. The frames of "SINIGER" trainers (see Appendix C
are also constructed at the airplane factory in Lovech. They are
equipped with German 7-cylinder, "Siemons SH 14A4" engines or Czechoslovak 4-25X1
cylinder "Walter" engines. The "Siemons SH 14A4" engines weigh 120 kilograms,
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
 Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
-3-
have 120 horse power maximum speed of 165 kilometers per hour and compression
ratio of 5.3 to 1. `here is another model with the same designation with 160
horse power and a compression ratio of 6 to 1.
10. The "SINIGER" planes have the following characteristics:
a. Wings: biplane 1.20 meters between wings; span nine meters; wings 80
centimeters wide, rectangular with rounded corners; dihedral angle, three
degrees, "from the roots"; backswept two degrees, untapered; total wing
area is about 20 square meters; the ailerons are near the tip of the wing;
no trim tabs on wings; no slots; no flaps;
b. Fuselage: overall length, 7.25 meters; height of fuselage, one meter;
overall height of aircraft 2.8 meters; the propeller tip is 80 centimeters
from the ground; tandem dual control; open cockpit; plexi-glass windshield;
o. Empennage: single fin and rudder; rectangular stabilizer and elevator;
d. Landing gears non-retractable landing gear; landing wheels are attached
to the fuselage by about 100 centimeter long struts; the wheels are inter-
connected; hydraulic shook absorbers; wheel 10 centimeters in diameter;
tire 40 centimeters in diameter; in place of a tail wheel, there is a steel
support called "Bekil" which has rubber shook absorbers; and
e. Miscellaneous: (See Appendix C)
1. Oil tank;
2. Gas tank; and
3. Reserve gas tank.
YAK-9p fighters had a cruising speed of 700 kilometers an hour which was
increased to 800 kilometers an hour by the introduction of a "reduotor".
German military a rora which had
been left in Bulgaria have all been replaced by Soviet planes. These replaced
plane have been stored intact in depots at the Kazanft and Karlovo airfields.
't'he engines have been covered with protective grease.
Jet Aircraft Flights
13. During June and July 1952 a pair of RIG-15 jets flying east 25X1
over Golyamo Krushevo at about 12 a.m. on several occasions.
14. In May 1953 a pair of jet planes flying east from Yambol towards 25X1
Burgas almos every o er y at about 2 p.m.
15. On 15 September 1953 two jet planes that were not MIC-15's 25X1
flying east over the western outskirts of Burgas about 5 p.m.
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
 Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-00810A003500740006-6
Appendix A
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY 125X1
-4-
Radar Station, Burgas
fi
4ppr.r, rancm of
ad~r- c~ l~ipraEmt
0zio-story-
'ba.rrncks, use
IA;iL 71C:TnT7-?
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-00810A003500740006-6
 Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
Appendix B CONFIDENTIAL/CONTROL--U.S. OFFICL LF, ONLY
-5-
ULAZ' T Type Planes
CONFIDENTIAL/CONTROL--U.S. OFFICIALS ONLY
Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
 Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6
Appendix C CONFIDENTIAL/CONTROL..-U.S. OFFICIALS ONLY 25X1
-6-
"SINIGER" Trainers
CONFIDENTIAL/CONTROL..-U.S. OFFICIALS ONLY
Sanitized Copy Approved for Release 2010/01/13: CIA-RDP80-0081OA003500740006-6