From Aero Digest, April, 1935:
The Northrop Corporation, Inglewood, California
• President: John K. Northrop. Vice-president, General Manager and Sales Manager: W. K. Jay. Export representative: E. P. Howard, 51 Canton Road, Shanghai, China.
One-place open (or closed) low-wing mail monoplane. ATC 549. Wright Cyclone SR1820, F -3 engine, 710 horsepower at 7000 feet. Span 47 feet 9.5 inches. Length overall 31 feet 2 inches. Height overall 9 feet. Wing area 363 square feet. Power loading 10.3 pounds per horsepower. Wing loading 21.2 pounds per square foot.
Empty weight 4119 pounds. Useful load 3231 pounds. Payload 1173 pounds. Gross weight 7350 pounds. Fuel capacity 334 gallons. Oil capacity 22 gallons.
Maximum speed 224 miles per hour. Cruising speed 215 miles per hour. Landing speed 60 miles per hour. Service ceiling 20,000 feet. Rate of climb 1200 feet per minute. Cruising range 1700 miles.
Fuselage: all-metal monocoque construction; center section of wing built integral
with fuselage; sliding hood. Wing: all-metal multi-cellular construction; two outer panels are separate from center section of wing; electrically-operated all-metal flaps on outer panels. Tail group: all-metal multi• channel construction; balanced; trim tabs on rudder and elevators; fin and stabilizer fixed. Fixed-type cantilever landing gear with 36 X 8 tires, Bendix wheels and mechanical brakes, oleo pneumatic shock absorbers; fully streamlined. Engine and plane controls ball or roller bearing equipped.
Standard equipment includes retractable or fixed leading edge landing lights, wing tip navigation lights, Navy-type standard tail lights, Hamilton Standard controllable pitch propeller.
Usual flight and engine instruments including Sperry directional gyro, Sperry artificial horizon, ice warning indicator, rate of climb indicator. Also see data in January, 1933, AERO DIGEST.