1416.
4416.
1430.
1431.
1460.
1485.
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nels, except wind tunnels specially designed for educational purposes and having a test section size (measured internally) of less than 25 cm. (By "test section size" is understood the diameter of the circle, or the side of the square, or The longest side of the rectangle constituting possible shapCS of the test section.)
(b) Devices for simulating environments at Mach 1.4 and above, including hot shot tunnels, plasms are tunaels, shock rubes, shock tunnels, gas tunnels and light gasguns;
(c) Specially designed parts and accessories therefor.
GROUP P.
TRANSPORTATION EQUIPMENT.
Vessels, as follows-
(a) Fishing vessels, and hulls therefor, designed for speeds of
17 knols or over when in full load (design) condition:
(b) Hydrofoil vessels;
(c) See-going vessels including coasters and bulls therefor, de- signed for speeds of over 23 koots when in full load (design) condition, taking into consideration hull form (cop- figuration) as well as power plant;
(d) Vessels with hulls and propulsion machinery made wholly
or primarily of non-magnetic materials;
(e) New ships with decks and platforms specially designed or
strengthened to receive weapons;
[ Vessels incorporating any Munitions List items, any of the following embargoed items: 1430, 1485, 1501, 1502, 1510 (excluding all types of fish Anding or whale finding equip- ment) or arrangements for the degaussing of the vessel.
Passenger-carrying liners having at least 4 decks and whos specifications, as far as hull construction is concerned, correspond to the Conventious on the Safety of Human Life at Sea in force at the time of their construction, when designed for speeds of over 23 knots but not higher than 25 knots.
Buoyant electric conducting cable suitable for sweeping magnetic mines.
Gas turbine engines for marine propulsion, whether originally de- signed as such or adapted for such use from acro-engines.
Aircraft, helicopters and aero-engines, all types, including ground and airborne equipment, not elsewhere specified, developed solely or used mainly for aircraft and helicopters. Compasses, gyroscopes, accelerometers and inertial equipment as follows-
(a) Gyro compasses possessing one or more of the following
characteristics--
(0) Automatic correction for the effects on compass ac curacy of changes in ship's speed, acceleration, or latitude.
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(Manually set machanical corrective devices such as the speed-course-latitude corrector on the Sperry MK 14 MOD
compasses are specifically excepted);
(ii) Provision for accepting ship's data as an electrical input;
(i) Provision for setting in corrections for current ser and drift;
(iv) Utilization of accelerometer, rate gyro, rate inter- grating gyro, or electrolytic levels as sensing devices;
(v) Provision for determining and electrically transmitting ship's level reference data (roll, pitch) în addition to own. ship's course data;
(b) Integrated fight instrument systems for aircraft which include either gyro-stabilizers or automatic pilots or both; (c) Gyro-astro compasses and other devices which derive either position or orientation or both by means of auto- matically tracking celestial bodies;
(d) Gyro-stabilizers used for other purposes than aircraft con-
trol, except those for stabilizing an entire surface vessel;
(e) Automatic pilots used for other purposes than aircraft
controls except marine types for surface vessels;
{ Accelerometers either with a threshold of 0.005 g or less or a linearity of less than 0.25% of output over the operat- ing range or both, which are designed for use in inertial navigation systems or in guidance systems of all types;
(g) Gyros and gyro compasses, as follows
( Gyros with a rated free directional drift rate (rated free procession) of less than 0.5 degree (1 Sigma or r.m.s) per hour in a 1 g environmeat:
(ü) Gyro compasses which incorporate gyros embargoed by sub-item (g)i) above or which, when operated In a gyro compass mode, have a compass error, before compensation, due to gyro drift of less than 1/30 of a radian (6) degrees or 1918 degrees approximately) at 0 degree latitude;
(4) Inertial equipment either using accelerometers embargoed by sub-item () above or eyros embargoed by sub-itam (0) above or both, and systems incorporating such equipment; (0 Specially designed parts, components, and test, calibration
and alignment equipment for the above.
GROUP P.
ELECTRONIC EQUIPMENT INCLUDING COMMUNICATIONS AND RADAR.
1.501.
1502.
Communication, navigation, direction finding and radar equip-
ment.
Communication, detection or tracking equipment of a kind using ultraviolet radiation, intra-red radiation or ultrasonic waves: and specialized parts therefor.