# STC SA944NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Avcon Industries Inc, United States - Description: Installation of the XR Drag Reduction System - Applied: July 20, 1977 - Status date: December 5, 2000 - Product: Aircraft, Small/Large Airplane - Certification basis: Part 21 - Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE) - Certificate PDF: https://openairdocs.org/files/sha256/b0/4b/b04b1d2d290539433e6b59481e3dd32a672168c7448e9221eecf550ef9e9ab83 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B9D4200DC02D8C1B86256FC0007763F2.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA944NW ## ADs that name it (2) - [AD 2005-23-06](https://openairdocs.org/ad/2005-23-06): Thrust reverser hydraulic system · Engine thrust reversers (NORDAM Group STC SA1669SW or 2 others). Effective Dec 19, 2005. Cited in the text - [AD 84-19-06](https://openairdocs.org/ad/84-19-06): Tab Control System · Learjet 24, 24A, 24B and 22 more. Effective Oct 22, 1984. Named in the applicability ## Approved models (8) - Learjet Inc. 24 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 24B ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 24D ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 25 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 25B ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 25C ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 25D ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) - Learjet Inc. 25F ([TCDS A10CE](https://openairdocs.org/tcds/A10CE)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA944NW This certificate issued to: Avcon Industries, Inc., a Kansas Corporation 516 N. Oliver, Hangar 'J" Newton, KS 67114 Purt 25 of the Federal Aviation Regulations. and including Amendment 25-18. Original Product Typo Cerlificato Number: ALOCE Make: Gates Learjet Model: 24, 24B, 24D, 25, 25B/C, 25D/F Description of Type Design Change: Installation of the XR Drag Reduction System in accordance with Dee Howard Company Drawing List No. 044 dated 12/15/82, or later FAA approved revision. Date of Application: July 20, 1977 Date Reissued: 11/12/99; 12/15/00 Date of Issuance: June 16, 1980 Date Amended: 7/9/80; 2/24/81; 3/20/81; 5/5/81; 8/6/81; 5/20/82; 5/31/83; 12/6/83 Rev. 8 FEDERAL AVIATION By Direction of the Administrator Michel MArley (Signature) TOMINISTRATO Michele M. Owsley, Manager Airplane Certification Office, Southwest Region (Title) 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA94 ANW Date of Issuance: June 16, 1980 Reissuance Date: December 13, 2000 Limitations and Conditions: (Continued): Supplemental Type Certificate ADDENDUM NO. SA944NW (24, 24B, 24D) AIRSPEED LIMITS (CAS) Aircraft previously approved for 350 knots Vmo retain 350 knots Vmo Aircraft approved for 300 knots Vmo may retain the 300 knots Vmo or may be approved for 350 knots Vo by the installation of the Dee Howard 350 knot Vmo Kit Number 360001-5, 24-100 through 24-180 or Kit Number 360001-4, 24-181 through 24-229 or Kit Number 360001-3, 24-230 through 24-328. Vie (Flaps Extended) Landing 150 KCAS Flaps 20° 200 KCAS Flaps 10° 250 KCAS VA Sea Level (15,000 lb.) 206.8 KCAS 30,000 ft. 213.0 KCAS VMCA (Minimum Control Speed) 85 KCAS The limitations noted in Type Certificate Data Sheet No. AlOCE are applicable except as shown in this STC. Engines Two General Electric Turbojet CJ610-6 C.G. Range (Landing All stations noted are body stations. Gear Extended) (+223.8) to (+235.4) at 9,000 lb. (+223.8) to (+235.4) at 9,219 lb. (+230.9) to (+235.4) at 15,300 1b. The variation between points is linear. Maximum Weights Ramp 15,300 lb. Takeoff 15,000 1b. Landing 12,630 1b. Zero Wing Fuel 11,400 lb. with ECR 1071, or 1514, or 1515 Additional Fuel Capacity (gal) Usable Two glove tanks 80 210.0 FAA Form 8110-2-1(10-69) Page 3 of 6 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA94 ANN Date of Issuance: June 16, 1980 Reissuance Date: December 13, 2000 Limitations and Conditions: (Continued): Supplemental Type Certificate ADDENDUM NO. SA944NW (24, 24B, 24D) The limitations noted in Type Certificate Data Sheet No. AlOCE are applicable except as shown in this STC. Control Surface Horizontal Stabilizer - Movements Upper Limit 0°00' to -0°30' Lower Limit -7°00' to -7°30' See appropriate FAA Approved Airplane Flight Manual Supplement Reissue A dated 9/28/83, or later FAA approved revision for all Model 24 airplanes. 2. This modification must be maintained in accordance with Dee Howard Maintenance Supplement No. R044-10 Maintenance Manual Nos. DHP-A-44-0, DHP-C-44-0 and DHP-K-44-0. 3. All Model 24 airplane must be modified with the STC SA944NW Teledyne AOA Systems to be eligible for this installation for flight to a maximum operating altitude of 45,000 feet. Supplemental Type Certificate ADDENDUM NO. SA944SW (25, 25B/C, 25D/F) AIRSPEED LIMITS Engines Two General Electric Turbojet CJ-610-6 or -8A if installed (25D/F Aircraft previously approved for 350 knots Vmo retain 350 knots Vmo. Aircraft approved for 300 knots Vo may retain the 300 knots Vmo or may be approved to 350 knots Vmo by the installation of the Dee Howard, 350 knots Vmo Kit Number 360001-2, 25-003 thru -060, 062 thru 066, or Kit No. 360001-1 for 25-061, 067 thru -205. VEe (Flaps Extended) Landing 150 KCAS Flaps 20° 200 KCAS Flaps 10° 250 KCAS VA (16,300 1b.) Sea level 206 KCAS 30,000 ft. 226 KCAS VMCA (Minimum Control Speed) 100 KCAS The limitations noted in Type Certificate Data Sheet No. AlOCE are applicable except as shown in this STC. FAA Form 8110-2-1 (10-69) Page 4 of 6 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuatian Sheet) Number: SA944NW Date of Issuance: June 16, 1980 Reissuance Date: December 13, 2000 Limitations and Conditions: (Continued): Supplemental Type Certificate ADDENDUM NO. SA944NW (25, 25B/C, 25D/F) C.G. Range (Landing All stations noted are body stations Gear Extended (366.8) to (383.25) at 10,000 or less (376.7) to (383.25) at 16,500 1b. (377.12) to (383.25) at 16,800 1b. The variation between points is linear. Maximum Weights Ramp 16,800 1b. Takeoff 16,300 lb. Landing 13,700 1b. Zero Wing Fuel 10,000 lb. (Model 25) Zero Wing Fuel 11,400 lb. (Model 25B/C, 25D/F) Additional Fuel Capacity (gal.) Usable Arm Two glove tanks 80 359.98 Control Surface Horizontal Stabilizer Movements Upper Limit -0°14' to -1°00' Lower Limit - 7°30' to -8°30' Other Operating Conditions FAA Approved Airplane Flight Manual Supplement, Reissue A, dated 7/13/82, Change 6 dated 9/28/83, or later FAA approved revision applies to all Model 25's. This modification must be maintained in accordance with Dee Howard Company Maintenance Manual Supplement No. R044-10 or Maintenance Manual Nos. DHP-A-44.1-0, DHP-C-44.1-0 and DHP-K-44-0. The following airplanes are eligible for the STC SA944NW XR installation when modified accordingly: Airplane Serial Numbers 25-003 thru 25-205 must be modified with the STC SA944NW Teledyne AOA System modification, or have the Conrac AOA System previously installed in accordance with GCC AAK76-4 to be eligible for flight to a maximum operating altitude of 45,000 feet. Airplane Serial Numbers 25-206 and subsequent must be modified with the STC SA944NW Teledyne AOA System modification, or be original unmodified type certificate airplane to be eligible for flight to a maximum operating altitude of 45,000 feet. FAA Form 8110-2-1(10-69) Page 5 of 6 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Cantinuation Sheet) Number: SA944N4 Date of Issuance: June 16, 1980 Reissuance Date: December 13, 2000 Limitations and Conditions: (Continued): Airplane Serial Numbers 25-230 and subsequent with -8A engines installed and with the original Conrac AOA System installed are eligible for flight to a maximum operating altitude of 51,000 feet. Compatibility of this modification with other previously approved modifications must be determined by the installer. - END- FAA Form 8110-2-1(10-69) Page 6 of 6 ## Every issue (1) - December 5, 2000: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b0/4b/b04b1d2d290539433e6b59481e3dd32a672168c7448e9221eecf550ef9e9ab83) --- 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.