# TCDS A-2-571: Consolidated Vultee Aircraft Corporation Stinson Division - Type: Type certificate data sheet - Status: Current - Holder: Consolidated Vultee Aircraft Corporation Stinson Division - Revision: 11 - Revised: January 23, 1950 - Product: Aircraft, Small Airplane - Certification basis: CAR 4a - Registered aircraft: 110, by the registry models matched to it (OpenAirDocs) - Data sheet PDF: https://openairdocs.org/files/sha256/4b/52/4b520e308884548a980bd1b3a66ffba5dfa2a91ce5892fac7aaa845b9cab22f5 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37B09588990DD4A58525673E005AB218.0001 - Page: https://openairdocs.org/tcds/A-2-571 ## Models (4) As the data sheet lists them. - BT-13B (Navy SNV-2) - BT-15 - BT-13 - BT-13A (Army SNV-1) ## What the data sheet says From the PDF's text layer, line by line; tables lose their columns. The PDF is the record. ```text Page No. 1 2 3 4 5 6 Rev. No. 8 8 10 10 11 11 Reformatted 7/94. DEPARTMENT OF COMMERCE CIVIL AERONAUTICS ADMINISTRATION A-2-571 Revision 11 CONS. VULTEE BT-13 BT-13A (Navy SNV-1) BT-13B (Navy SNV-2) BT-15 January 23, 1950 AIRCRAFT SPECIFICATION NO. A-2-571 Manufacturer Consolidated-Vultee Aircraft Corp. San Diego, Calif. I - Model BT-13, BT-13A(Navy SNV-1), BT-13B(Navy SNV-2), 2 PCLM, Approved June 2, 1945. Engine (1) P&W Wasp Jr. TIB2 or Military Model R-985-25 or -27 (See Item 108 for (2) P&W Wasp Jr. TIB3 or Military Model R-985-AN-1 or -AN-3 optional engine) (3) P&W Wasp Jr. SB-3 or Military Model R-985-AN-8 Fuel 87 min. octane aviation gasoline 80 min. octane may be used provided engine power is limited to 400 hp for all operations. Engine limits (1) & (2) For all operations, 2300 rpm (450 hp) (With 87 min. (3) Maximum continuous, octane fuel) (Sea level) 34.5 in. Hg., 2200 rpm (400 hp) (Straight line manifold pressure variation with altitude to 5000 ft.) 33.5 in. Hg., 2200 rpm (400 hp) Take-off (one minute), 36.5 in. Hg., 2300 rpm (450 hp) Airspeed limits Level flight or climb 177 mph True Ind. Glide or Dive 207 mph True Ind. Flaps extended 111 mph True Ind. C.G. range (+31.9) to (+41.3) Empty weight C.G. range (+30.6) to (+32.1) If the empty weight C.G. falls within this range, checking of critical forward and aft C.G. positions is unnecessary. This range is not valid for 3 or 4 place or any other non-standard arrangements. Maximum weight 4350 lbs. (See NOTE 2 re 4745 lbs. for passengers and NOTE 3 re 3920 lbs. with wing tips removed). 4745 lbs. for cargo only No. seats 2 (1 at +45) (1 at +105) Maximum baggage 175 lbs. (+132.5) Fuel capacity 120 gal. (+56) (one 60-gal. tank in each side of center section. Right tank has reserve of 17 gal. included in the capacity of 60 gal.) Oil capacity 10.9 gal. (-8.5) Control surface movements Wing flaps Down 60° Elevator Up 30° Down 25° Elevator trim tab Up 25° Down 25° Aileron Up 25° Down 11.5° Aileron trim tab Up 3° Down 6° Rudder Right and Left 35° Rudder trim tab Right and Left 25° Serial Nos. eligible All Army and Navy serial numbers. Use mfgs. serial number for certification if available. Required equipment Items 1(a), 101, 103, 104, 106, 107, 201, 202 Note: Wood components may be interchanged with similar metal parts, provided one wood wing is not used with one metal wing. A-2-571 Page 2 Note: When constant speed propeller is used with any approved engine, or when P&W Wasp Jr. SB-3 or Military model R-985-AN-8 engine is installed, a manifold pressure gauge must be installed in each cockpit. When the aircraft is not engaged in flight training, the manifold pressure gage in the rear cockpit is not required. II - Model BT-15, 2 PCLM, Approved May 31, 1945 Engine Wright R-975E3 or Military Model R-975-11 (See Item 108 for optional engine) Fuel 80 min. octane aviation gasoline Engine limits Maximum continuous, 2200 rpm (420 hp) Take-off (one minute), 2250 rpm (450 hp) Airspeed limits Level flight or climb 177 mph True Ind. Glide or Dive 207 mph True Ind. Flaps extended 111 mph True Ind. C.G. range (+31.9) to (+41.3) Empty weight C.G. range (+30.6) to (+32.1) If the empty weight C.G. falls within this range, checking of critical forward and aft C.G. positions is unnecessary. This range is not valid for 3 or 4 place or any other non-standard arrangements. Maximum weight 4350 lbs. (See NOTE 2 re 4745 lbs. for passengers) 4745 lbs. for cargo only No. seats 2 (1 at +45) (1 at +105) Maximum baggage 175 lbs. (+132.5) Fuel capacity 120 gal. (+56) (one 60-gal. tank in each side of center section. Right tank has reserve of 17 gal. included in the capacity of 60 gal.) Oil capacity 10.9 gal. (-8.5) Control surface movements Wing flaps Down 60° Elevator Up 30° Down 25° Elevator trim tab Up 25° Down 25° Aileron Up 25° Down 11.5° Aileron trim tab Up 3° Down 6° Rudder Right and Left 35° Rudder trim tab Right and Left 25° Serial Nos. eligible All Army and Navy serial numbers. Use mfgs. serial number for certification if available. Required equipment Items 1(b), 101, 103, 104, 106, 107, 201, 202 Note: Wood components may be interchanged with similar metal parts, provided one wood wing is not used with one metal wing. Note: When constant speed propeller is used with any approved engine, or when P&W Wasp Jr. SB-3 or Military model R-985-AN-8 engine is installed, a manifold pressure gauge must be installed in each cockpit. When the aircraft is not engaged in flight training, the manifold pressure gage in the rear cockpit is not required. Specifications Pertinent to All Models Datum Forward Face of Firewall Leveling means Lugs at right of rear cockpit at stations 113-5/32 and 132-33/64 Certification basis Airworthiness Certificate only (CAR 4a.031) Export eligibility Eligible for export to all countries except as follows subject to the provisions of ASR 312 (MOP 2-4 contains the same information): (NOTE: Export license from State Dept. may be necessary for these models). Canada - landplane eligible. skiplane not eligible. Equipment: Propellers and Propeller Accessories 1. Propeller - Ham. Std. two-position controllable, hub 2D30, blades 6101A-12 to 6101A-14 (a) Models BT-13, -13A, -13B, SNV-1, SNV-2 163 lbs. (-59) (b) Model BT-15 163 lbs. (-62.5) Diameter - 9' 1/8" maximum, 8' 9-3/4" minimum A-2-571 Page 3 Pitch settings at 42 inch station: Models BT-13, -13A, -13B, SNV-1, SNV-2: Low - 12.5°; High - 18.5° Model BT-15: Low - 13.5°; High - 18.5° 2. Propeller - Army two-position controllable, hub 2D30 Blades 42K13717 (for models BT-13, -13A, 13B, SNV-1, SNV-2 only) 177 lbs. (-59) Diameter - 9' 1/8" maximum, 8' 9-3/4" minimum Pitch settings at 42 inch station: Low 13.5°; High 19.5° 3. (a) Propeller - Ham. Std. constant speed, hub 2D30, blades 6101A-12 to 6101A-14 163 lbs. (-59) Dia. 9' 1/8" max., 8' 9-3/4" min. Min. low pitch setting 9° at 42 in sta. (Models BT-13, -13A, -13B, SNV-1, -2 only) (b) Constant speed governor - Ham. Std. 1A2 4. (a) Propeller - Ham. Std. constant speed, Hub 2D30, blades 6101A-18 to 6101A-20. Dia. 8' 6" max. 8' 4" min. Min. low pitch setting stop 10° (Models BT-13, -13A, -13B, SNV-1, -2 only) (b) Constant speed governor - Ham. Std. IC2 5. (a) Propeller - Ham. Std. constant speed, Hub 2D30, blades 6101A-24 to 6101A-26. Dia. 8' 0" max. 7' 10" min. Min. low pitch setting 12° (Models BT-13, -13A, -13B, SNV-1, -2 only) (b) Constant speed governor - Ham. Std. IC2 6. Propeller - Ham. Std. two-position, hub 2D30, blades 6101A-18 to 6101A-20. Dia. 8' 6" max. 8' 4" min. Pitch settings: Low 13 1/2°, high 20 1/2° (Models BT-13, -13A, -13B, SNV-1, -2 only) 7. Propeller - Ham. Std. two-position, hub 2D30, blades 6101A-24 to 6101A-26. Dia. 8' 0" max. 7' 10" min. Pitch settings: Low 15°, high 20° 8. Propeller - Ham. Std. hub 12D40, blades 6101A-12 for use with 175 lbs. Item 108 an Item 9 only. Pitch settings at 42" R.: Low 11°, high 27°. 9. Ham. Std. Model 1A12-G constant speed governor. Engine and Engine Accessories - Fuel and Oil System 101. Carburetor air preheater and muff Model BT-13A 16 lbs. (-28) Model BT-15 16 lbs. (-31) 102. Starter Eclipse H-5 (Model BT-13A) 37 lbs. (-23) Eclipse Type 444 (Model BT-15) 37 lbs. (-26) 103. Oil cooler U.A.P. U-3170-W-D5 (Model BT-13A) 18 lbs. (-14.5) Air Research 2D-3281 (Model BT-15) 19 lbs. (-16) 104. Engine-driven fuel pump Chandler Evans, Type F (Model BT-13A) 2 lbs. (-34) Pesco, F-4A (Model BT-15) 2 lbs. (-25.5) 105. Engine-driven vacuum pump Pesco, Type B-12 (Model BT-13A) 6 lbs. (-31.5) Pesco, Type B-12 (Model BT-15) 6 lbs. (-24.0) 106. Fuel unit (strainer, hand pump and controls) 9 lbs. (+49.5) 107. Engine cowl and supports Model BT-13A39 lbs. (-28) Model BT-1539 lbs. (-31.5) 108. Engine - P & W Military Model R-1340 AN-1 with the following limits: Max. continuous (Sea level) 34.0 in. Hg., 2200 rpm (550 hp) (Straight line manifold pressure variation with altitude to 5000 ft.) 32.5 in. Hg., 2200 rpm (550 hp) Take-off (one minute) 36.0 in. Hg., 2250 rpm (600 hp) A-2-571 Page 4 Installation of above engine requires North American AT-6 engine cowling, cylinder baffles, induction and exhaust system, oil cooler and AT-6 engine mount, as modified by Precipitation Control Company of Phoenix, Arizona, per Dwg. G-2351M. C.G. range for this installation is (+31.9) to (+36.8), unless extended by additional flight testing. This item requires propeller item 8. Landing Gear and Floats 201. 27 inch smooth contour wheels and brakes (Hayes Model 2750A) 6 or 8 ply tires 127 lbs. (+14) 202. 10 inch smooth contour tail wheel (Goodyear) with 4 or 6 ply tire 6 lbs. (+248) Electrical Equipment 301. Battery-Gould D-6-A, 12 volt 71 lbs. (-4) 302. Generator- 50 Amp. Leese-Neville E-5A (Model BT-13A) 24 lbs. (-28.5) Eclipse Type 790 (Model BT-15) 24 lbs. (-27) Interior Equipment 401. "DT TWIN SEAT" installation manufactured by Vest Aircraft Co., Repair Dept, 4600 Dahlia St., Hayden Field, Denver, Colorado Seat kits to be installed in accordance with manufacturer's installation instructions and Dwg. Nos. 1, 2, 3, 4, and 5, and Nos. I, II, an III dated November 29 and 30, 1946. 402. Model V40 Kit for three place conversion manufactured by Aircraft Fabrications Co., 424 Richards Road, Municipal Airport, Kansas City 6, Missouri. Seat kits to be installed in accordance with manufacturer's installation instructions and drawing diagrams A, B, C, D, E, F, G, and H. 403. Twin seat for 3-place conversion mfg. by Rawdon Bros. Aircraft Co., 6628 E. Central, Wichita, Kansas Seat kits to be installed in accordance with mfg.'s installation instructions and Dwg. No. BT-3600. 404. Three place conversion (twin rear seat) North Aviation Company Northport White Bear Lake 10, Minnesota Seat kits to be installed in accordance with manufacturer's installation instructions, drawings and photographs. 405. BT Twin Seat "Standard" Vest Aircraft Company - Repair Depot 4600 Dahlia Street Denver, Colorado Seat kits to be installed in accordance with manufacturer's installation instructions and drawing Nos. I, II, III, and IV dated April 25, 1947. 406. Four-place Conversion Kit Les Farrar Aircraft Sales San Bernardino Airport 900 42nd Street San Vernardino, California Conversion to be made in accordance with manufacturer's installation instructions, photograph, and drawings 103- 1, 103-2, and 103-3. 407. Three-place Conversion (twin rear seat) Aircraft Conversion Company 2849 Pinckard Street North Redondo Beach, California Seat kits to be installed in accordance with manufacturer's installation instructions and drawings 10003.5, 20001, 30002, and 30003, dated May 25, 1947, May 25, 1947, May 24, 1947, May 23, 1947 respectively. 408. Two to Three-Passenger Seat Kit. Valiant Aero Service P.O. Box 99 Roscoe, California Conversion to be made in accordance with manufacturer's installation instructions and Drawings Nos. BT-1A, BT- 1B, and BT-1C. A-2-571 Page 5 NOTE 1. The following must be accomplished prior to certification of the aircraft: (a) Placard rear cockpit, "Solo Flying From Front Seat Only." (b) Placard both cockpits, "Intentional Spinning Prohibited" and "Caution: Unless Right Tank is full, use Reserve or Left Tank for Take-off and Landing." (c) Provide an oil measuring stick for oil tank. (d) Deleted - April 10, 1947 (e) Modify the elevator trim tabs by adding a two-inch wide strip of .032 inch Alclad along the trailing edges so that 1.5 inches of the strips extend rearward from the present trailing edges. On the aluminum tabs, rivet the strip of the present tabs by means of 1/8 inch diameter rivets spaced two inches on centers. On wood tabs, rivet the strips to the present tabs by means of 1/8 inch diameter hollow rivets and washers spaced two inches on centers. Metal elevator trim tabs manufactured in accordance with Drawing No. 1, Paul T. Arnold, 4042 Tilden Avenue, Culver City, California, are acceptable for use on all models. These tabs incorporate the 1-1/2" extension required. (f) For day operation, only circuit protectors in the circuits to electrical equipment used in the operation need be made accessible to the pilot in flight. The airplane should be restricted to day operation. (g) To make the airplane eligible for night operation the following must be accomplished: (1) Provide certificated position lights. (2) Remove position light resistors. (3) Relocate all electrical circuit protective devices so that they are accessible to the pilot in flight. (h) Removal of the propeller spinner is optional. (i) Placard the baggage compartment, "Maximum capacity 175 lbs." (j) BT-13. A generator field switch should be installed adjacent to the battery actuating toggle switch now installed on the front cockpit electrical panel, and the levers of the two switches should be ganged for master switch operation. BT-13A and BT-15. A generator field switch should be installed to be controlled by the pilot in the front cockpit. In addition, the battery solenoid circuits now connected to the ignition switch should be removed and connected to a separate switch installed adjacent to the generator switch and ganged with it. BT-13B. Either the battery or generator switch should be moved so that these switches are adjacent to each other, and the levers of the two switches should then be ganged. NOTE 2. (a) Airplanes with all metal wings equipped with "flap lids" and/or with wing tips removed, in accordance with approved data listed in NOTE 2(b) below, are eligible as passenger carriers with the following limitations: Maximum take-off and landing weights: (1) With "flap lids" only 4745 lbs. (2) With wing tips removed 3920 lbs. (3) With "flap lids"and removed tips 4450 lbs. C. G. limits (See diagram below) Gross wt., LBS. 4800 3900 4000 4100 4200 4300 4400 4500 4600 4700 31 33 35 37 39 41 With "flap lids" only installed With "flap lids" installed and wing tips removed Basic airplane Rear Limit With wing tips removed C.G. in inches from fwd. face of firewall Front Limit A-2-571 Page 6 (b) Approved modification kits may be obtained from the following agencies: (1) "Flap lids" - Dixie Air, Inc., Van De Graff Field, Tuscaloosa, Alabama, Drawing No. R-101-1 or Installation instructions and Drawing No. D-1 furnished with kit. (2) Wing tip modification: Clover Clip Company, Box 2013, Tucson, Arizona, Drawings 101-1 and 101-2. - END - ``` ## ADs (5, in force first) - [AD 46-06-04](https://openairdocs.org/ad/46-06-04): Propeller Spinner Attaching Lugs · Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1) and BT-13B (Navy SNV-2) - [AD 47-25-10](https://openairdocs.org/ad/47-25-10): Elevator Tab Failure · Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1) and BT-13B (Navy SNV-2) - [AD 49-07-03](https://openairdocs.org/ad/49-07-03): Fuel System Placard · Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1) and BT-13B (Navy SNV-2) - [AD 49-27-01](https://openairdocs.org/ad/49-27-01): Fuel Line Rework · Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1) and BT-13B (Navy SNV-2) - [AD 52-02-01](https://openairdocs.org/ad/52-02-01): Bronze Rear Spar Fittings · Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1), BT-13B (Navy SNV-2) and 1 more ## Registered aircraft by registry model (OpenAirDocs) - [Consolidated Vultee BT-13A](https://openairdocs.org/model/consolidated-vultee-bt-13a): 56 aircraft (registry code 2420224) - [Consolidated Vultee BT-13B (SNV-2)](https://openairdocs.org/model/consolidated-vultee-bt-13b-snv-2): 11 aircraft (registry code 2420228) - [Convair BT-13A](https://openairdocs.org/model/convair-bt-13a): 11 aircraft (registry code 2420204) - [Consolidated Vultee BT-15](https://openairdocs.org/model/consolidated-vultee-bt-15): 8 aircraft (registry code 2420312) - [Consolidated Vultee BT-13](https://openairdocs.org/model/consolidated-vultee-bt-13): 7 aircraft (registry code 2420222) - [Convair BT-15](https://openairdocs.org/model/convair-bt-15): 4 aircraft (registry code 2420302) - [Convair BT-13](https://openairdocs.org/model/convair-bt-13): 3 aircraft (registry code 2420202) - [Convair BT-13B](https://openairdocs.org/model/convair-bt-13b): 3 aircraft (registry code 2420208) - [Cons Vultee/Basinger BT-13A](https://openairdocs.org/model/cons-vultee-basinger-bt-13a): 1 aircraft (registry code 2420225) - [Cons Vultee/Lacey BT-13B](https://openairdocs.org/model/cons-vultee-lacey-bt-13b): 1 aircraft (registry code 2420229) - [Cons Vultee/Pittman BT13](https://openairdocs.org/model/cons-vultee-pittman-bt13): 1 aircraft (registry code 2420220) - [Consolidated Vultee/Gunderson BT-13A](https://openairdocs.org/model/consolidated-vultee-gunderson-bt-13a): 1 aircraft (registry code 2420221) - [Consolidated Vultee/Vanech BT-13A](https://openairdocs.org/model/consolidated-vultee-vanech-bt-13a): 1 aircraft (registry code 2420223) - [Consolidated/Nocco C VULTEE BT-13](https://openairdocs.org/model/consolidated-nocco-c-vultee-bt-13): 1 aircraft (registry code 2420201) - [Vultee/Reed Ron BT-13A](https://openairdocs.org/model/vultee-reed-ron-bt-13a): 1 aircraft (registry code 2421705) - [Consolidated Vultee BT-13B](https://openairdocs.org/model/consolidated-vultee-bt-13b): 0 aircraft (registry code 2420231) - [Consolidated/Diaz Mark A BT-13A](https://openairdocs.org/model/consolidated-diaz-mark-a-bt-13a): 0 aircraft (registry code 2420227) - [Vultee BT-13](https://openairdocs.org/model/vultee-bt-13): 0 aircraft (registry code 2421704) - [Vultee BT-13B](https://openairdocs.org/model/vultee-bt-13b): 0 aircraft (registry code 2421706) ## STCs approved under this data sheet (24) - [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC - [STC SA7965SW](https://openairdocs.org/stc/SA7965SW): Application of fabric and polyurethane finishing system.. Shady Aviation 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 SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc. - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation - [STC SA6070NM](https://openairdocs.org/stc/SA6070NM): Installation of a 'quick-disconnect drain plug' on the engine rocker sump for the oil drain retrieval system after engine shutdown.. West Coast Air Creations - [STC SA01282NY](https://openairdocs.org/stc/SA01282NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830.. Airwolf Filter Corporation - [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 SA11172SC](https://openairdocs.org/stc/SA11172SC): Installation of an ADS600-B Automatic Dependent Surveillance-Broadcast (ADS-B) Universal Access Transceiver (UAT) and Global Positioning System (GPS) antenna. NavWorx Inc - [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric.. Aviation Products Systems 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 SA02594CH](https://openairdocs.org/stc/SA02594CH): Installation of a fuel selector valv. Crone Enterprises LLC - [STC SA241CH](https://openairdocs.org/stc/SA241CH): Install Ceconite 101 fabric.. Aviation Products Systems Inc. - [STC SA1008WE](https://openairdocs.org/stc/SA1008WE): Installation of Poly-Fiber covering material.. Poly-Fiber Inc. - [STC SA00068LA](https://openairdocs.org/stc/SA00068LA): Installation of tail wheel adapter ring.. R-R-R-Russ Aircraft - [STC SA1351WE](https://openairdocs.org/stc/SA1351WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12). Ceconite Inc - [STC SA4-1210](https://openairdocs.org/stc/SA4-1210): Installation of Eonnex cover on aircraft surfaces.. Ceconite, Inc - [STC SA4-592](https://openairdocs.org/stc/SA4-592): Eonite covering on ailerons and rudder.. Lott William C - [STC SA1350WE](https://openairdocs.org/stc/SA1350WE): Replace existing fabric on wings, fuselage, empennage and/or control surfaces with fiberglass cloth.. Ceconite, Inc - [STC SA4-625](https://openairdocs.org/stc/SA4-625): Flap lids.. Mann E H & E Snow - [STC SA4-404](https://openairdocs.org/stc/SA4-404): Glass cloth application on control surfaces.. Glasco-Air Products - [STC SA4-840](https://openairdocs.org/stc/SA4-840): Fabric replaced with glass cloth on wings, fuselage, empennage and/or control surfaces.. Air Fibre Inc --- 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.