# TCDS TC 626: The Waco Aircraft Company - Type: Type certificate data sheet - Status: Current - Holder: The Waco Aircraft Company - Revision: 0 - Product: Aircraft, Small Airplane - Registered aircraft: 26, by the registry models matched to it (OpenAirDocs) - Data sheet PDF: https://openairdocs.org/files/sha256/7b/6d/7b6d0c101fa6859b6ff816fac9506b883f5b6228969dfd9d7f9354d5f28a5211 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4C632306D44369808525673F00605A06.0001 - Page: https://openairdocs.org/tcds/TC%20626 ## Models (2) As the data sheet lists them. - ZKS-7 (Army UC-72M) - YKS-7 (Army UC-72K) ## What the data sheet says This is OCR from the scanned FAA data sheet. OCR can misread letters and numbers. ```text MODEIS: Waco YKS-7 (Army UC-72K) and ZKS-7 (Army UC-72M) 1.C. NOMBER: 626 I - SPECIFICATIONS PERTINENT TO ALL MODELS: Propeller Maximum permissible diameter 107 inches (for clearance) Placard speeds Level flight or climb - 140 mph True Ind. Glide or dive - 168 mph True Ind. Fuel capacity 70 gallons (two 35 gallon tanks in upper wings) (-11.5) cil capacity 5 gallons (-44) No. passengers 4 (1 at -2.5, 3 at +27) (crew at -2.5) Baggage 100 lbs. (+45) Standard weight Landplane 3250 1bs. Seaplane 3540 1bs. C.G. limits Landplane (-14.4) and (-2.5) Seaplane (-12.9) and (-3.7) Datum Lower wing leading edge Leveling means lower surface upper wing at strut points Certification basis Type Certificate No. 626 (Aero. Bulletin 7A) Froduction basis None (See NOTE A) Serial numbers 4551 and up per NOIE A and all AAF numbers of Models UC-72K and UC-721. Use manufacturer's number when available. EQUIPMENT: (* Means net increase) Class I: landplane: 101- Engine ring cowl 27 1bs. 102. 103. Generator Starter (Eclipse E-80) 20 Its. (-51) (a) Bosch LE70/12) (YKS-7) 13 1ts. (-54) 105. 104. Battery (Reading ARI-11) 7.50-10 wheels (b) Eclipse IV-180 (ZKS-7) (Hayes 750M) with (See NOTE 3) 35 1bs. (-44) (-54) 8.50-10 tires 106. 10x3 tail wheel 107. Oil cooler 108. Wheel cuffs 109. Rocoteen upholstering 110. Gunmetal gray paint 111. Propeller - wood (fixed pitch) including hub (a) Model YKS-7 42 1bs. (b) Model ZKS-7 46 Ibs. Seaplane: (Items 101, 102. 103, 104, 110 and 111 PLUS) 151. Edo model 38-3430 floats with water rudders Seaplane type vertical tail surfaces replacing landplane type 335 lrs.* Miscellaneous items as noted in approved weight and balance report. 201. Large starter (Eclipse F-141) 10 1bs.* (-53) Large generator (a) Eclipse D-2 (ZKS-7) (YKS-7) 13 lts.* 8 1bs.* (-54) (C) Eclipse LV-180 (YKS-7) 5 1bs.* (c) Eclipse G-2 (YKS-7) 8 lbs.* (-54) (ZKS-7) 3 1bs. * (-54) 204. 203. Pressure fire extinguisher Oil heater 3 1bs. (-36) OI (+12) 206 - 205. 207. Leather upholstering Litter installation 100 gallon fuel capacity (two 15 25 lbs.* 5 lts. to 12 1bs. * (+7) (+97) gallon tanks in lower wings) an d 6-1/2 gallon oil capacity 35 1bs.* 208. Propeller - Hamilton Standard adjustable metal 36 lbs.* (-79) 209. Rear parachutes or parachute type seats 32 1bs.* (-79) 210. battery (Exide) 7 1bs.* (-44) 211. (YKS-7) Hamilton Standard huh 2B20, blades 6109A-6 to 6109A-16, sive, or 6135A-6 to 6135A-16, inclusive. Diameter 8'6" maximum, 7'7 minimum. 104 1bs. Class III: 301. 302. 303. Cactus proof tubes "y" type control column (inspector Wheel streamlines 21 ibs. 10 lks.* (-24) (-28) 304. Miscellaneous extra instruments and should specify type installed) 3 1bs. * (-24) 305. panel Propeller - fixed pitch metal 25 1ks. (-34) (Curtiss 55501) (a) YKS- 7 (b) ZKS-7 (-79) (-79) 306. Flares (b) (a) Five 1 minute Three 1-1/2 minute 13 1bs. 17 1bs. (+70) 307. Landing lights (Grimes retractable) 11 lbs. (+7) 308. Engine shielding 11 1bs. (-75) 309. 52 lbs. (+27) 310. Extra door and wing walk 16 1bs. * (+19) 311. Special paint (+27) 312. Tail wheel lock Neglect increase 313. Cabin ventilators 3 lbs.* 314. Cabin heater 5 lbs.* (-51) 315. Soundproofing 316. Air brakes 10 1bs. * 317. (a) Jacobs I-4M engines installation (magneto ignition) (YKS-7) 15 lbs.* (b) Jacobs I-4MB engine installation (magneto and battery ignition) (YKS-7) 8 lbs.* (c) Jacobs I-6M engine installation (magneto ignition) (ZKS-7) 15 1bs.* (a) Jacobs I-5MB engine installation (magneto and battery ignition) 8 1bs. * Front parachutes or parachute type seats wide type landing gear - tread 103-1/2 inches No weight change 320. Revised engine cowl (Drawing 21987) Neglect weight increase Skis (use actual weight) Grab and Smith GS-1 NOTE A. Each aircraft of Models YKS-7 and 2KS-7 manufactured after 4/13/43, must, prior to original certification, satisfactorily pass: An inspection for workmanship, materials and conformity before any covering, metal priming or final finish is applied. may be varnished. A final inspection of the completed aircraft. A check of the flight characteristics. NOTE 1. Same as YKS-6 or ZKS-6 (ATC 533) except wing fittings, landirg gear moved forward 4 inches, fixed trim tak added to rudder, miscellaneous changes in fuselage and controls. NOTE 2. Eligible for export as follows subject to inspection for equipment specified in Chapter XII of Inspection Handbook: • Skiplane - not eligible. However, structure complies with canadian reguirements, for ski installation when special axle per Waco Drawing No. 20243 and tread with skis is equivalent to that with wheels. Maximum ski height 13 inches. - Seaplane - maximum standard weight 3430 1bs. All other countries except Australia and New zealand. NOTE 3. Item 103(a) or (b) may be removed when item 317(a) or (c) is installed. II - MODEL YKS-7 (UC-72K), DESIGNATION 5 PCI-SB Engine Jacobs L-l Placard limits For all operations, 2000 rpm (225 hp) III - MODEL ZKS-7 (ARMY UC-72M), DESIGNATION 5 PCL-SB (Same as YKS-7 except engine. Empty weight approximately 35 lbs. greater than YKS-7.) Engine Jacobs L-5 Placard limits Take-off and climb 2000 pm (285 hp) For all other operations 1910 Ipm (250 hp) ``` ## ADs None name its models. ## Registered aircraft by registry model (OpenAirDocs) - [Waco YKS-7](https://openairdocs.org/model/waco-yks-7): 21 aircraft (registry code 9600835) - [Waco ZKS-7](https://openairdocs.org/model/waco-zks-7): 5 aircraft (registry code 9600838) ## STCs approved under this data sheet (10) - [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC - [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC - [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber Inc. - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [STC SA01406NY](https://openairdocs.org/stc/SA01406NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and rotary wing. Airwolf Filter Corporation - [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories.. Electronics International Inc. - [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line.. M-20 Oil Separators LLC - [STC SA2350NM PAGE 2](https://openairdocs.org/stc/SA2350NM%20PAGE%202): Installation of Electronics International Inc digital carburetor/outside air temperature gauges. Electronics International - [STC SA2190NM PAGE 2](https://openairdocs.org/stc/SA2190NM%20PAGE%202): Installation of electronics International Digital Volt/Amp Gauges and Accessories.. Electronics International - [STC SA2350NM](https://openairdocs.org/stc/SA2350NM) (historical): Installation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories.. Electronics International --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.