# STC SA4585NM-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Learjet Inc, United States
- Description: Installation of Honeywell/Sperry EDZ 603 Single EFIS System.
- Applied: October 21, 1988
- Status date: May 7, 2002
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A22CE](https://openairdocs.org/tcds/A22CE)
- Certificate PDF: https://openairdocs.org/files/sha256/45/13/451366a7ab01f82eca2c7e95888e1d72fe67e70ab51cfef68cfcbf9017e690e1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/717E053B46C1531A85256CC2000E3D52.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4585NM-D

## ADs that name it (0)

None.

## Approved models (1)

- The Cessna Aircraft Company S550 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))

## 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: SA4585NM-D This certificate issued to:

Learjet Inc.

One Learjet Way Wichita, Kansas 67209 Part 25 of the Federal Aviation Regulations.

Original Product -Type Certificate Number: A22CE Make: Cessna Model: S550 Description of Type Design Change:

Installation of Honeywell / Sperry EDZ603 Single EFIS System in accordance with Combs Gates Denver, Inc. Drawing List DL64673, revision N/C, dated November 11,1988, FAA approved November 28, 1988, or later approved revision.

1. FAA approved Aircraft Flight Manual Supplement, dated November 28, 1988 or later approved revision is required.

2. This approval should not be extended to aircraft of this model on which previously approved modifications are incorporated unless it is determined that the interrelationship 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 Certification and Flight Manual Supplement must be maintained as part of the permanent records for the modified aircraft.

Date of Application: October 21,1988 Date Reissued: January 4, 1995 May 7, 2002 Date of Issuance: November 30, 1988 Date Amended:

FEDERAL AVIATION By Direction of the Administrator (Signature) David T. Grossman Program Manager TOMNISTRATO Denver Aircraft Certification Office. Northwest Mountain Region, Denver, Colorado (Title)

## Every issue (1)

- May 7, 2002: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/45/13/451366a7ab01f82eca2c7e95888e1d72fe67e70ab51cfef68cfcbf9017e690e1)

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