# STC SA4398SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Honeywell International Inc., United States
- Description: Modification of air to air heat exchanger (P/N 179450-2-2 or194110-1).
- Applied: January 15, 1981
- Status date: September 10, 2021
- Product: Aircraft, Large Airplane
- Certification basis: Part 1, Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/98/ef/98efed4e5ccaf4a156fdaa918030004f0fd296e362814692793e1c31d2e15512
- Approved model list and other attachments: [SA4398SW_AML.pdf](https://openairdocs.org/files/sha256/3e/f1/3ef1e811c96f46d4e769f8f7c6d4c97b56a57d42839406473f16773b58ef9331)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5C41DB2916A60DD3862587580049A243.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4398SW

## ADs that name it (0)

None.

## Approved models (2)

- McDonnell Douglas Corporation DC-9 Series ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation MD-88 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## 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.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate This certificate issued to:

SA4398SW Honeywell International Inc.

1944 E Sky Harbor Circle N Phoenix, AZ 85034 .

the * Regulations A6WE Make: Original Product Type Certificate Number:

McDonnell Douglas *See attached FAA Approved Model List (AML) Modification of air to air heat exchanger (P/N 179450-2-2 or P/N 194110-1) according to Drawing 85LB2064, Sheets 1 through 3, Revision E, dated 12-07-90, and Drawing 80LB2021, Sheets 1 and 2, Revision P, dated 1-29-91, or later FAA approved revisions. *CAR 4b is applicable to the DC-9 Series through -51. FAR 25 is applicable to the DC-9-80 Series and to Model MD-88.

1) Compatibility of this modification with previously installed equipment must be determined by installer.

2) 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.

January 15, 1981 Date Reissued:

10/8/87; 10/01/96; 11/15/05; 11/14/12; 9/10/21 Date of Issuance: Date Amended:

June 26, 1981 8/20/81; 3/20/85; 6/6/91 Revision 3 By Direction of the Administrator Signature:

William S. Shealy ODA Administrator, ODA-602216-NM

SA4398SW

### SA4398SW_AML.pdf

FAA APPROVED MODEL LIST (AML) SA4398SW Honeywell International Inc.

1944 E Sky Harbor Circle N Phoenix, AZ 85034 Date of Issuance: June 26, 1981 Date Amended: June 06, 1991 Date Reissued: November 14, 2012; September 10, 2021 Item Aircraft Make Aircraft Model Original Type Certificate Number Regulation/Part 1 McDonnell Douglas DC-9 Series A6WE CAR 4b/ FAR 25 2 McDonnell Douglas MD-88 A6WE CAR 4b/ FAR25 FAA Approved: ____________________________________________ William S. Shealy ODA Administrator, ODA-602216-NM Date: September 10, 2021

## Every issue (3)

- September 10, 2021: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/98/ef/98efed4e5ccaf4a156fdaa918030004f0fd296e362814692793e1c31d2e15512), [SA4398SW_AML.pdf](https://openairdocs.org/files/sha256/3e/f1/3ef1e811c96f46d4e769f8f7c6d4c97b56a57d42839406473f16773b58ef9331)
- November 14, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/63/78/63787ea235fce683c356b768829aaf36144973144d87624ae70a3265b2144311), [SA4398SW_AML.pdf](https://openairdocs.org/files/sha256/de/f0/def02f3c77e570bb87b3871678112ad7be221d2bc56100c278fd98d7bbd097c6)
- November 15, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/9a/b0/9ab0626d019fbd865244732db430ba8bad4c24d26a384eb6da8eeda95430ca5a)

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