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Aprproved-type certificates issued for propellers 506 Appr pproved- tyhe certificates fxsyed for para- 57 7 val issued for gliders. ar ters - Letters of approval issued for dotestle en- u Engines having calibration rating...........- Laters of of apptoval for propellers_ 119 Letiers of approval issued for pontoons. 32 Letters of al issued for skis. ...-....--. 31 Latter of approval issued for foreign engines_. 15 Repair stattons approved, active... .-.....ne8 180 Schools approved, active-.....-.--.-- 2 Ground instructors licensed, active... 62 Fiying instructors ratings, active_........--.. 84 New Approved-Type Cerfifi- cates Approved-type certificates (certifi- cate numbers and dates in parentheses) have been issued the following: AIRPLANES Waco, UPF-7 and VPF-7, 8-place open land biplane. Engine, Continental WéT0K or KI UP BO) or Continental Wé670M or Mt FT). (842, @ 6-37.) Linted aa 15, 1937, pe anny “in Jul Doug: a5, SA) 31-place closed land monopane, Engines, 2 P & W twin Wasp SE3G's at 800 bh. P. or2 Fp é&éW Reto Wasp BE-G's at 900 h ($47, €-30-87.) Waco, URS ‘and VEKS-7 Place closed land bi ane. Engine, Continental WéT0K or EK1 (UKS-7) or Continental W670M or Ml (¥ES-7). (648, 6-837.) Beechcraft, pie *B-place closed land bi- plane. Engive, F' & Wasp Jr. 8B. (649, T-16—-07-) ENGINES Kinner, S8C-7, 7-cyl, radial air cooled, 350 bh. p. at 1,900 ©. p.m. at 6,000 ft. altitude. .) Listed as pending in July Wright, Double Row Cyclone GR-2600A-2, l4-cyl. radial alr cooled—3:1 reduction rs, 1,200 h. p. at 2,100 r. B m. at &.700 t. resgure altitude. (7 6-10-37, ) Listed aa pending in July 15, 19387. Allison, V1710-C4, 12-cyl. vee liquid sooled—2': 1 reduction gears, 1.000 h. p, 7 2,806 Tr. p. i. at fea level. i1T7, 7-16-37. Waterman- Brudebaker, 54, 6-cyl. in line quid cooled, foe bp 8 at 800 r. p. m. at Bea level. tT Pratt & Whithe,, Tein Wasp Jr. SBI-G 14-cyl. radia} air cooled, 750 bh. p. at Pago r. p. m. at 9,500 ft, alfitude. (170, 7-22- 375 PROPELLERS Maynard Di Cesare, DC-500-1, steel, 9 ft. 0 i. diameter, adjustable itch, "830 b. p 2,000 r. p.m. (580 37.) Listed ae pendin in May 15, 1837. Curtiss, 892305 biade aluminum alloy ae . to 10 ft. 6 diameter, control lable pitch, 285 h. p., ns r. Dp. mM. AIR COMMEnV£ BULLETIN 4 43 Everel, I-88-A, birch with fabric or stainless steel tipping, 6 it. in. diameter, automatic pitch, 40 h. p., BB15 Yr. p. mm. (693, 7-19-87.) Hartzel, 4105, birch or martered oak with brass or stainless pied ee OG he ft. 6 in. diameter, 4 ft. 2 in. piteh, 90 h. p., 2.250 rp. m. (604, T+26-37.) 695—pending. Letters of Approval (Numbers and dates in parenthescs) AIRPLANE Vultee, V-1A Special, 8-place elosed land mone lane. Engine, Wricht Cyclone SR- 1820G-5, 850 bh. p. (2-539, T-B-d7.) GLIDER Sport-Flugreugbau, Hutter H-17, 1-place open gina monoplane ({sailplane). 2-6, Change in List of Approved Schools Change name of Roosevelt Aviation School, Psy Roosevelt Field, Mineola, Long Taland to Roosevelt Field. Ine. Avia. tion mG ehooi pte ees Repair Stations Issued Ap- proved Repair Station Certifi- cates New York State Aviation Repalr Station, 5265 John | Street, Utica, N. ¥., approved July 6, 1937, for repair of weld ateel tube atructure, wooden structure, fabric coverin wood-covered wings, fuselages and contro surfaces, and box and laminated spars, steel fittings, and assembly. Pennsylvanis-Central Airlines Corpora- tion, Allegheny County Alr ort Pittsburgh, Pa,, approved July 15 for repair of welded steel tube structure. *wooden struc- ture excluding box and laminated spars wood-covered uselages, wings and control surfaces, fabric covering, steel fittings, aluminum alloy structure, aluminum alloy fittings, assembly, aluininum alloy propeller biades ‘and/or steel hubs, engines, and {n- atrumente, Changes in List of Approved Repair Stations Delete Atlanta Air Services, Candler Field, Atlanta, Ga. Commercial Aircraft Co., Inc., Portland Airport, Portland, Oreg., delete for r epalr of welded steal tube structure, excluding fittings, and steel fittings. Tnter City Airlines, ine., Boston Munici- pal Airport, Hast Boston, Mass., add for re- pair of aluminum alloy structure, aluminum allo: fittings, aluminum alloy propeller blades and/or steel hubs, wooden ee engines, and instruments. Jete Pacifie Aircraft Pera Co., Angeles Airport, Inglewood ro