# STC ST12014LA

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aircraft Technical Development Inc. Dba Aerocon Engineering Company, United States
- Description: Installation of Aerocon Engineering Company (AEC) On-Board Airstairs
- Applied: August 2, 2021
- Status date: May 28, 2025
- Product: Aircraft, Large Airplane
- Certification basis: Part 25
- Data sheets: [TCDS T00063IB](https://openairdocs.org/tcds/T00063IB)
- Certificate PDF: https://openairdocs.org/files/sha256/1d/79/1d79d5df3fde50f75c2a46e7c34252ba93a4ea2f0c001c55ddf855c1a23f329b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID126906700620250604181931.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST12014LA

## ADs that name it (0)

None.

## Approved models (1)

- Airbus SAS A350-941 ([TCDS T00063IB](https://openairdocs.org/tcds/T00063IB))

## 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.

ST12041LA Aircraft Technical Development Inc. Dba Aerocon Engineering Company 7716 Kester Avenue Van Nuys, California 91405 Part 25 Title 14 CFR T00063IB Airbus SAS A350-941 Series The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of that airplane.

08/02/2021 05/28/2025 for Manager, West Certification Branch 3 Installation of Aerocon Engineering Company (AEC) On-Board Airstairs in accordance with FAA Approved AEC Master Drawing List (MDL) ASA350-8900, Revision A, dated February 20, 2025, or later FAA approved revisions.

ST12041LA 3

ST12041LA (Continuation Sheet)

The approval of this modification applies to the above noted airplane model series only. A copy of this STC must be included in the permanent records of the modified aircraft.

Instructions for Continued Airworthiness (ICA), Aerocon Engineering Company Maintenance Manual Supplement Document No. MMS-ASA350-2159, Revision NC, dated July 25, 2022, or later FAA accepted revision must be made available to the operator at the time of installation.

Certification Basis:

For the model A350-941 airplane, the certification basis is 14 CFR part 25, effective February 1, 1965, including Amendments 25-1 through 25-129.

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

- End - 3 3 Add Page

## Every issue (1)

- May 28, 2025: Issued, Current. [certificate](https://openairdocs.org/files/sha256/1d/79/1d79d5df3fde50f75c2a46e7c34252ba93a4ea2f0c001c55ddf855c1a23f329b)

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