# STC SA2857CE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Learjet Inc, United States
- Description: Installation of the hot interphone system modification to the D-B systems audio amplifier and control system.
- Applied: August 19, 1992
- Status date: October 5, 1992
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE)
- Certificate PDF: https://openairdocs.org/files/sha256/7d/04/7d0453c9b7c6cf20f3364c9546578a72b5e3c9bd927a4ada21ab6715b2385083
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/079F99ED9E05FF0D85256CC20008CA19.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2857CE

## ADs that name it (0)

None.

## Approved models (2)

- Learjet Inc. Learjet 35A (C-21A) ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 36A ([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 SA2857CE This certificate issued to: 8220 W. Harry Learjet Inc.

Wichita, KS 67209 Certifies that the change in the type design for the folvwing praluck will tho dirritations und conditions therefrasspecifiedheremmedsteninerliness requiroments/ Furt 25 afthe Federal Aviation Ruyululius effective February 1, 1965, as amended and Special Conditions as delineated on Type Certificate Data Sheet No. A10CE Original Product -Type berlificateNumber:

Make: Learjet Mixtel: 35A and 36A Contrarillang systems audio amplifier and control system in Installation of the Hot Interphone System accordance with: (1) Learjet Inc. Master Document List (MDL) No.

T100085, No Revision, dated September 9, 1992, and (2) FAA Approved Airplane Flight Manual Supplement (AFMS) W1261 dated October 5, 1992, or later FAA Approved revisions of (1) or (2).

Limitations and Conditions: This approval should not be extended to other specific airplanes of these models 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 airplane.

August 19, 1992 Date of Issuance: October 5, 1992 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Laurence A. Hesson (Signature) TOMINISTRA Wichita Aircraft Certification Office Lawrence A. Herron, Manager (Title)

## Every issue (1)

- October 5, 1992: Issued, Current. [certificate](https://openairdocs.org/files/sha256/7d/04/7d0453c9b7c6cf20f3364c9546578a72b5e3c9bd927a4ada21ab6715b2385083)

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