# STC SA48NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Sierra Industries Inc, United States - Description: Installation of fowler flaps, flap actuated drooped ailerons, flap actuated elevator trim and anti- servo rudder trim tab. - Applied: May 1, 1973 - Status date: July 31, 2017 - Product: Aircraft, Small Airplane - Certification basis: Part 3, Part 21 - Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) - Certificate PDF: https://openairdocs.org/files/sha256/42/d8/42d836f59ff006bcd9f68b1da08faac554466a5ad9d3e85e1d8f6c1756231b04 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4CC7250D197C2C9E8625871B004A0644.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA48NW ## ADs that name it (0) None. ## Approved models (1) - Textron Aviation Inc. 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) ## 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. FAA Form 8110-2 (5/14) Page 1 of 4 Reissued on July 31, 2017 to supersede the original STC, which has been lost or misplaced. Number: SA48NW Part 3 of the Civil Air Regulations, (see type certificate data sheet A7CE). Original Product – Type Certificate Number: A7CE Make: Cessna Model: 414 (Normal Category) Installation of Fowler Flaps, Flap Actuated Drooped Ailerons, Flap Actuated Elevator Trim and Anti -Servo Rudder Trim Tab in accordance with FAA Sealed Robertson Aircraft Drawing List No. 24. FAA Approved Robertson Aircraft Airplane Flight Manual Supplement is required. Date of Application: May 01, 1973 Date Reissued: 11/8/84; 10/10/86; 9/8/05; 7/31/17 Date of Issuance: June 29, 1973 Date Amended: November 07, 1974 Signature Title Jim Grigg Manager, Fort Worth A CO Branch, Compliance & Airworthiness Division Sierra Industries, Ltd. 122 Howard Langford Drive Uvalde, TX 78801 FAA Form 8110-2 (5/14) Page 2 of 4 Transfer the ownership of Supplemental Type Certificate Number: SA48NW To (Name and address of transferee) From (Name and address of grantor) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA48NW FAA Form 8110-2 (5/14) Page 3 of 4 Date of Issuance: June 29, 1973 Date Amended: November 07, 1974 Date of Reissuance: July 31, 2017 This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. Supplemental Type Certificate Addendum No. SA48NW is a part of this STC. A copy of this Certificate and Addendum No. SA48NW shall be maintained as part of the permanent records for the modified aircraft. The conditions and limitations of Type Certificate Data Sheet No. A7CE apply except as follows: This STC Addendum, which is a part of Supplemental Type Certificate No. SA48NW prescribes conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations. A copy of this STC Addendum is required to be maintained as part of the modified aircraft’s permanent records. SUPPLEMENTAL TYPE CERTIFICATE HOLDER: R/STOL SYSTEMS, INC. V. Model 414 (Normal Category) Airspeed Limits (CAS) Flaps Extended 10° 195 MPH Flaps Extended 30° 145 MPH Control Surface Movements Wing Flaps Down 10° ± 1° Down 30° +1°, -2° Main Surface Ailerons Flap Droop Aileron Travel Position Neutral From Droop Neutral 0° 0° ± 1° UP 20° +1°, -0° Down 20° +1°, -0° 10° +1°, -1° 8° ± 2° UP 12° ± 2° Down 28° ± 2° 30° +1°, -2° 8° ± 2° UP 12° ± 2° Down 28° ± 2° Rudder – No change. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA48NW FAA Form 8110-2 (5/14) Page 4 of 4 Date of Issuance: June 29, 1973 Date Amended: November 07, 1974 Date of Reissuance: July 31, 2017 Tab (Main surface in neutral, measured normal to rudder hinge line) Rudder Rudder Position Trim Position Tab Position * 0° 0° 0° 32° +1° Right 0° 6° ± 1° Right -0° 32° +1° Left 0° 3° ± 1° Left -0° 0° Full Right 18° +1° Left -0° 0° Full Left 13° +1° Right -0° *Measured from Rudder Surface. NOTE 1. WHEN MODIFIED PER STC SA48NW ADD 50 POUNDS AT STATION 200 TO THE WEIGHT AND BALANCE REPORT. **NOTE 2. THE PLACARDS SPECIFIED IN THE FAA APPROVED CESSNA AIRPLANE FLIGHT MANUAL** MUST BE DISPLAYED PLUS THE FOLLOWING CHANGES MADE BY THE FAA APPROVED ROBERTSON AIRCRAFT FLIGHT MANUAL SUPPLEMENT. A. Maximum Flap Extension Speed - 10° Flap: 195 MPH CAS (169.3 KCAS) B. Maximum Flap Extension Speed - 30° Flap: 145 MPH CAS (125.9 KCAS) C. Minimum Single-Engine Control Speed Flaps 10°-------------------------83 MPH CAS (72 KCAS) Flaps UP-------------------------97 MPH CAS (84 KCAS) Red Radial Line D. Warning – Flaps up prior to opening door. -END- United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA48NW FAA Form 8110-2 (5/14) Page 5 of 4 ## Every issue (2) - July 31, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/42/d8/42d836f59ff006bcd9f68b1da08faac554466a5ad9d3e85e1d8f6c1756231b04) - September 8, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/cd/55/cd5552864c32ed1cd940b4ef9f22b10c3a33cf2a45f9b093dce1f42d10370cf0) --- 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.