# STC SA2-346

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Signature Flight Support Corporation, United States
- Description: Modification of flap and trailing edge.
- Applied: November 20, 1957
- Status date: August 31, 2000
- 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/sha256/3f/91/3f914751510978d27b1a92834d9a73b31d493d70ed742f8b663f1806073f7d3a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/08A37F7FB3EDB74685256CC10083D47C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2-346

## ADs that name it (0)

None.

## Approved models (1)

- Lockheed Martin Aeronautics Company 18 ([TCDS A-723](https://openairdocs.org/tcds/A-723))

## 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.

JHnitriJ gfatt* ffif ^ JBepartmenl of tErHnspartniitm - ^phcral ^fitatton ^Afrmmislratmn Certificate SA2-346 signature Flight Support Corporation, a Delaware Corporation 7511 Lemmon Avenue, Hangar C Dallas, TX 75209 3R407 Civil Air 723 Lockheed 18 Modification of flap and trailing edge in accordance with Drawing List SD10400Q-D dated September 15, 1965, or later FAA approved revision.

An increase in flap speeds is optional with this modification for Lockheed 18, but aircraft not certificated under SR407 must have placard installed calling out increased flap speed as shown on AFM Supplement dated 9/29/61 and Lockheed 18 certificated under SR407 must have FAA Approved AFM Supplement dated 9/29/61 and placard calling out increased flap speeds.

This STC is part of the basic Howard 250 and H250 Tri-Gear modifications and this modification is covered in the flight manuals for each model.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

e&rffe.

.• November 20, 1957 . -March 03, 1958 . 6/15/92; 12/21/98; 8/31/00 .-June 2, 1982 Rev. 13 (Signature)- Frances Cox Manager, Special Certification Office, Southwest Region {Title) Any altaratlpa cf thla certificate lj puntsbablf by ti fjne of not exceeding $1,000, Of onofitt not exceeding 3 ysais, or ?orn B110-ZUO-68) Pags 1 of This certirioals My (* transferred in jccordanoe with FA^ 21.47.

INSTRUCTIONS The transfer endorsement below may be used 10 notify the appropriate FAA Regional Office of I he transfer of [his Supple me ma I Typo Ceriilic ale.

The FAA will reissui' th<- certiorate in iht name of the transferee and forward it lo him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (A ddras of transferee) and itrfff) (City, Slalt, ami ^!fladr) from (JVame of grantor) (Print or type) .—— (Address of grantor) { Mumbfr and strffl} (City, Start, and ZIP t Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

**C FAA AC 69-SS38**

## Every issue (1)

- August 31, 2000: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3f/91/3f914751510978d27b1a92834d9a73b31d493d70ed742f8b663f1806073f7d3a)

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