# STC SA1778NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Thompson Aero Products, United States - Description: Installation of a descent rate control (DRC) system (wing spoilers and speed brakes) including pneumatic actuating system. - Applied: June 21, 1982 - Status date: May 10, 1984 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A13CE](https://openairdocs.org/tcds/A13CE), [TCDS A20CE](https://openairdocs.org/tcds/A20CE) - Certificate PDF: https://openairdocs.org/files/sha256/52/b0/52b04014b27c78fad2d43f85f8502d265eb78c8ae81772d6717acbd7e0b22334 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/21CC666F662BE66E85256CC10083D04F.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA1778NM ## ADs that name it (0) None. ## Approved models (4) - Cessna Aircraft Company 177 ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) - Cessna Aircraft Company 177A ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) - Cessna Aircraft Company 177B ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) - Cessna Aircraft Company 177RG ([TCDS A20CE](https://openairdocs.org/tcds/A20CE)) ## 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: SA1778Nx This certificate issued to: Thompson Aeronautical Consultants Purt 23 of the Federal Aviation Regulations , dated February 1, 1965. Original Product - Type Certificate Number: A13CE A20CE Make: Cessna Cessna Model: 177, 177A and 177B 177RG Description of Type Design Change: Installation of a Descent Rate Control (DRC) System (Wing Spoilers and Speed Brakes) including a pneumatic actuating system in accordance with Precise Flight, Inc. DRC Installation Manual Report No. 107. Approval of this change in type design applies to the above Limitations and Conditions: model aircraft only. This approval should not be extended tc aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of thos other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate, Addendum No. SA1778NM, Owner's Manual or Pilot's Operating Handbook for Descent Rate Control (DRC), and FAA Approved Flight Manual Supplement shall be maintained as part of the permanent records for the modified aircraft. Date of Application: June 21, 1982 Date Reissued: May 10, 1984 Date of Issuance: January 28, 1983 Date Amended: FEDERAL AVIATION Pharto ELebro psoder *MINISTRATOR Manager, Seattle Aircraft Certification Offic 47. **FAA FORM B110-2 (10-68)** niced States of Anctica Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) May 10, 1984 e Number SA 1778NM Supplemental Type Certificate ADDENDUM NO. SA1778NM The conditions and limitations of the original Type Certificate Data Sheet apply except where superseded by the following: Supplemental Type Certificate Data Sheet, which is part of STC SA1778NM, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations: Supplemental Type Certificate HOLDER: Precise Flight, Inc. CESSNA MODEL 177, 177A, 177B, and 177RG (NORMAL CATEGORY) AS MODIFIED BY STC SA1778NM Engine: Same as Type Certificate Data Sheet A13CE or A20CE Fuel: Same as Type Certificate Data Sheet A13CE or A20CE Engine Limits: Same as Type Certificate Data Sheet A13CE or A20CE Propeller and Propeller Limits: Same as Type Certificate Data Sheet A13CE or A20CE C. G. Range: Same as Type Certificate Data Sheet A13CE or A20CE Serial Numbers: Refer to Type Certificate Data Sheet Equipment: Cessna Owner's Manual or Pilot's Operating Handbook and AFMS for DRC System must be maintained in the airplane at all times. NOTE 1: Current weight and balance report including list of equipment in the certified empty weight must be in the aircraft. NOTE 2: In addition to the Placards and Markings required by Type Certificate Data Sheet, Note 2, apply the following: (a) The following placard is to be in front and in full view of the pilot: **MAXIMUM SPOILER DEPLOYED SPEED - 160 KNOTS (CAS)** **FAA FORM B110-2-1 (10-69) PAGE 3 OF 4 PAGES** United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) May 10, 1984 c Number SAI778NK Supplemental Type Certificate ADDENDUM NO. SA1778NM (b) The following placard is to be mounted on the throttle controller: **APPROACH** **ENROUTE OFF** (c) The following placard is to be placed in front and in full view of the pilot: **DESCENT RATE CONTROL FOR OPERATING INSTRUCTIONS** **AND LIMITATIONS - SEE SUPPLEMENT IN OWNER'S MANUAL** OR PILOT'S OPERATING HANDBOOK NOTE 3: With the described DRC System Installation, performance will be at least equal to or better than that given in the Owner's Manual or Pilot's Operating Handbook for the Cessna 117 Series or the 177RG airplane. - END - **FAA FORM 8110-2-1 (10-69) PAGE 4 OF 4 PAGES** ## Every issue (1) - May 10, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/52/b0/52b04014b27c78fad2d43f85f8502d265eb78c8ae81772d6717acbd7e0b22334) --- 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.