# STC SA1785NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: AeroAcoustics Aircraft Systems Inc., United States
- Description: Installation of a de-icing operational placard.
- Applied: January 3, 1983
- Status date: January 5, 1983
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-723](https://openairdocs.org/tcds/A-723)
- Certificate PDF: https://openairdocs.org/files/sha256/c0/5e/c05ec6588a05051243cd8ee1b51a9026b227af3daec49aa75e625d2cb20e8338
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/128CD983D3C2AC0A85256CC10083D076.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1785NM

## ADs that name it (0)

None.

## Approved models (1)

- Lockheed Aircraft Corporation 18 ([TCDS A-723](https://openairdocs.org/tcds/A-723))

## 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: SA1785NM This certificate issued to: Aerobase, InC.

Part 4a of the CiVil Air Regulations Original Product - Typobertificate Number: A-723 Make: Lockheed (Learstar) Model: 18 Description of Type Design Change: Installation of a de-icing operational placard in accordance with Aerobase, Inc. Installation Drawing No. L18-1, dated January 5, 1983, or later FAA approved revision.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to 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 those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificat and the FAA Approved Airplane Flight Manual Supplement shall be maintained as part of the permanent records for the modified aircraft.

This certificate and the supporting data which is the basis for approval shall nemain in effect until sur vendered, suspended, vecked, or a termination date is otherwise established by the Sldministrator of the Federal Aviation Administration Date of Application: January 3, 1983 Date Reissued:

Date of Issuance: January 5, 1983 Date Amended:

FEDERAL AVIATION rection of the Sidministrater Vanell M Pederon (Signature ) TO MINISTRAIO Acting Manager, Seattle Aircraft Certification Office (Title)

I PAD! A

## Every issue (1)

- January 5, 1983: Issued, Current. [certificate](https://openairdocs.org/files/sha256/c0/5e/c05ec6588a05051243cd8ee1b51a9026b227af3daec49aa75e625d2cb20e8338)

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