# STC SA5757NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: Aeronautical Testing Service Inc., United States - Description: Installation of vortex generator system on wing and vertical stabilizer. - Applied: April 8, 1991 - Status date: June 17, 1994 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 3A25](https://openairdocs.org/tcds/3A25) - Certificate PDF: https://openairdocs.org/files/sha256/2d/a5/2da50c08e1d48a83bcd332a41bf988e12e05ff7981bb0128526ed1cd9bd400d5 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3C99A5415D64489485256CC200122B37.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA5757NM ## ADs that name it (0) None. ## Approved models (3) - The Cessna Aircraft Company 320D ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - The Cessna Aircraft Company 320E ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - The Cessna Aircraft Company 320F ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. Number SA5757NM This certificate, issued to: Aeronautical Testing Service Part 3 of the Civil Air Regulations. Original ProductType Certificate Number: 3A25 Make: Cessna Model: 320D, 320E, 320F Description of the Type Design Change: Installation of vortex generators on the wing and vertical stabilizer, and strakes on the inboard and outboard sides of the engine nacelles, in accordance with an FAA approved copy of Aeronautical Testing Service, Inc. Drawing List No. ATS-310K-Q, Revision B, dated May 26, 1994, or later FAA approved revision. NOTE: Several modification options are provided. These may include changes to the airplane stall speed, minimum control speed, and maximum gross weight. For specific information regarding each option, including Supplemental Airplane Flight Manual (SAFM) requirements, please refer to Continuation Sheet (page 3 of 6) Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. Date of application: April 8, 1991 Date reissued: Date of issuance: August 4, 1992 Date amended: September 28, 1993; October 18, 1993; June 17, 1994 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) Number SA5757NM Aeronautical Testing Service, Inc. Issued: December 22, 1993 Reissued: Amended: September 28, 1993; October 18, 1993; June 17, 1994 Description of the Type Design Change continued: Description of Modification Options: Each of these options incorporate the vortex generator kit. Option 1: All models; no change in airspeeds, airspeed indicator markings or placards; SAFM not required. Option 2: All models; reduced VMCA and stall speeds, changes required for airspeed indicator markings and placards; SAFM required. Option 3: All models equipped with 2-bladed propellers; reduced VMCA and stall speeds; increased gross weight, changes required for airspeed indicator markings and placards; SAFM required. Option 4: All models equipped with 3-bladed propellers or a 300 Hp or 325 Hp engine installation in accordance with RAM STC No. SA2750SW or SA4011SW, respectively; reduced VMCA and stall speeds; increased gross weight, changes required for airspeed indicator markings and placards; SAFM required. The following aircraft limitations apply to the various options: Option 1: No change Option 2: Reduced VMCA and stall speeds Option 3: Models with two-bladed propellers; reduced VMCA and stall speeds; increased gross weight. 320D C.G. Range (landing gear extended): (+38.70) to (+42.97) at 5304 lbs. (takeoff) (+38.00) to (+43.10) at 5200 lbs. (landing) (+43.60) at 4800 lbs. (+32 .00) to (+43.60) at 4300 lbs. or less Straight line variation between points given. **FAA FORM 8110-2-1 (10-69) PAGE 3 OF 6 PAGES** Number SA5757NM Aeronautical Testing Service, Inc. Issued: December 22, 1993 Reissued: Amended: September 28, 1993; October 18, 1993; June 17, 1994 Weights: Ramp 5350 lbs. Takeoff 5304 lbs. Landing 5200 lbs 320E, F . C.G. Range (landing gear extended): (+40.07) to (+42.97) at 5406 lbs. (takeoff) (+39.30) to (+43.10) at 5300 lbs. (landing) (+43.60) at 4900 lbs. (+32.00) to (+43.60) at 4300 lbs. or less Straight line variation between points given. Weights: Ramp 5450 lbs. Takeoff 5406 lbs. Landing 5300 lbs. Option 4: Models with three-bladed propellers or a 300 Hp or 325 Hp engine installation in accordance with RAM STC No. SA2750SW or SA4011SW, respectively; reduced VMCA and stall speeds; increased gross weight. 320D C.G. Range (landing gear extended): (+39.83) to (+42.76) at 5474 lbs. (takeoff) (+38.00) to (+43.10) at 5200 lbs. (landing) (+43.60) at 4800 lbs. (+32.00) to (+43.60) at 4300 lbs. or less Straight line variation between points given. Weights: Ramp 5520 lbs. Takeoff 5474 lbs. Landing 5200 lbs **FAA FORM 8110-2-1 (10-69) PAGE 4 OF 6 PAGES** Number SA5757NM Aeronautical Testing Service, Inc. Issued: December 22, 1993 Reissued: Amended: September 28, 1993; October 18, 1993; June 17, 1994 320E, F C.G. Range (landing gear extended): (+41.34) to (+42.75) at 5579 lbs. (takeoff) (+39.30) to (+43.10) at 5300 lbs. (landing) (+43.60) at 4900 lbs. (+32.00) to (+43.60) at 4300 lbs. or less Straight line variation between points given. Weights: Ramp 5620 lbs Takeoff 5579 lbs. Landing 5300 lbs. Supplemental Airplane Flight Manual (SAFM): Aircraft modified per this STC must be operated in accordance with the following Aeronautical Testing Service, Inc. (ATS) SAFM, or later FAA revisions: Option 1: SAFM not required. Option 2: ATS SAFM Report Nos. ATS 92·02g (3200) and ATS 92-02h (320E and 320F), Revisions "B," each revised June 8, 1994. Option 3: ATS SAFM Report Nos. ATS 92-02r (3200) and ATS 92-02s (320E and 320F), with two bladed propellers, Revisions "A," each revised June 8, 1994. Option 4: ATS SAFM Report Nos. ATS 92-02m (3200) and ATS 92-02n (320E and 320F), with three bladed propellers, Revisions "A," each revised June 8, 1994. ATS SAFM Report Nos. ATS 94-09a (3200) and ATS 94-09b (320E and 320F), for 300 Hp aircraft modified per STC SA2750SW, each dated June 17, 1994. ATS SAFM Report Nos. ATS 94-09f (3200) and ATS 94-09g (320E and 320F), for 325 Hp aircraft modified per STC SA4011SW, each dated June 17, 1994. **FAA FORM 8110-2-1 (10-69) PAGE 5 OF 6 PAGES** Number SA5757NM Aeronautical Testing Service, Inc. Issued: December 22, 1993 Reissued: Amended: September 28, 1993; October 18, 1993; June 17, 1994 Records: The following must be maintained as part of the permanent records for the modified aircraft: Option 1: A copy of this Certificate. Options 2, 3 and 4: A copy of this Certificate and the appropriate FAA approved SAFM. Other Limitations: All Options: The ATS modification consists of ninety (90) vortex generators mounted on the wings and vertical fin, and four (4) metal strakes, one mounted on the inboard and outboard sides of each engine nacelle. If more than four vortex generators are missing or damaged, the aircraft must be flown in accordance with the original markings, placards and manual. If more than six vortex generators are missing or damaged, or if any strake is missing or damaged, the aircraft is not airworthy and must be repaired before flight. Refer to the appropriate SAFM for specified Operating Limits placard language and airspeed indicator markings for Options 2, 3, 4. - END - **FAA FORM 8110-2-1 (10-69) PAGE 6 OF 6 PAGES** ## Every issue (1) - June 17, 1994: Amended, Current. [certificate](https://openairdocs.org/files/sha256/2d/a5/2da50c08e1d48a83bcd332a41bf988e12e05ff7981bb0128526ed1cd9bd400d5) --- 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.