# STC SA7975SW-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: RAM Aircraft, Limited Partnership, USA
- Description: Option 1: Install Vortex Generators on vertical stabilizer in accordance with RAM Drawing No. 1474 Rev. B. dated
March 4, 1991 or later FAA approved revision. Option 2: Same as Option 1, except no change in airspeeds;
Supplemental Flight Manual not required. Option 3: Install vortex generators on vertical stabilizer and wing top
- Applied: December 13, 1990
- Status date: March 10, 2008
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS 3A25](https://openairdocs.org/tcds/3A25)
- Certificate PDF: https://openairdocs.org/files/sha256/64/9b/649bb177ffb0bfcec1eb296b53efd6e556e1a319a659933babf81057623cebac
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID110410326820230324142237.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA7975SW-D

## ADs that name it (0)

None.

## Approved models (3)

- Textron Aviation Inc. 335 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Textron Aviation Inc. 340 ([TCDS 3A25](https://openairdocs.org/tcds/3A25))
- Textron Aviation Inc. 340A ([TCDS 3A25](https://openairdocs.org/tcds/3A25))

## 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.

11XTi±à$tat f !artmett± f Ir nzpnrtathrn - rI baffnn xnixtzfra±irnt $upplimflthxt Jgp JItrtffitate Project No. ST1GO1SC-A SA7975SW-D '4' RAMAircraft,LimitedPartnership 7505KarlMay Drive Waco,TX 76708 ad e I 'eJS gnze, iaJ9 o/ /eã het 'Sc□ 3A25 '#e2i. Cessna 335;340;340A Option1:InstallVortexGeneratorsonverticalstabilizerin accordancewithRAMDrawingNo. 1474Rev.B.dated March4, 1991or laterFAAapprovedrevision. Option2: SameasOption1,except nochangein airspeeds;

SupplementalFlightManualnot required. Option3: Installvortex generators onverticalstabilizerandwingtop (Seecontinuationsheet3 of4) thihz Option 1: VortexGeneratorInstallationonVerticalStabilizerOnly.

A) Standard335,340and340A - FAAApprovedSupplementalFlightManualNo.F M1001datedApril2, 1991,is required.

(Seecontinuationsheet3 of4)

c.'a eth ed 6yo4e< ,49de e ___ e áfi 4~va j1 e December13, 1990 1 February27, 1991 ,tgged'. October08, 2001;March10,2008 1a rnw4ci - (Signature) S. Frances ox,Manager SpecialCertificationOffice, SouthwestRegion (Title) Any alterationof thiscertificateis punishableby a fine of not exceeding$1,000,orirriprisonrnentnot exceeding2 years,or both.

- FAA Form 8110-2(10-68) Page 1 00 4 Thiscertificatemay be transferred in accordancewithFAA 21.47.

ni±g ta±s (13f uwrica partmnt nf rxxt jrnrtatnn - rd rittirn mthztratiuu $uppImxthil Igjw rlifirate (iIrnttrniinn $Iet) SA7975SW-D Date of Issuance:February27, 1991 Date of Reissuance:March10,2008 (Continued):

surfacein accordancewithRAMDrawingNo. 1474Rev.B datedMarch4, 1991orlaterFAAapprovedrevision.

Option4: Sameas Option3, except no changein airspeeds;SupplementalFlightManualnot required.

ewl z*' (Continued):

B) 340and340AIncreasedGrossWeight - Thismodification(STCSA7975SW-D)hasbeenfoundto be compatible withSTC5A7382SW-D and5A7365SW-D. CombinedFAAApprovedSupplementalFlightManualNo. FM1002 datedApril 2, 1991,is required.

C) 340and340AIncreasedGrossWeightandHorsepower - Thismodification(STC5A79755W-D)hasbeenfoundto be compatiblewithSTCSA23465W-D and5A42415W-D. CombinedFAAApprovedSupplementalFlightManual No.FM1003datedApril2, 1991,is required.

Note: Compatibilityof the combinedmodificationslistedabovewithfuturerevisionsto eitherSTCmust be determined by theinstaller.Theinstallermust determinewhetherthisdesignchangeis compatiblewithpreviouslyapproved modifications.If theholderagreesto permitanotherpersonto usethiscertificateto alterthe product,theholdershall givetheotherpersonwrittenevidenceof thatpermission.

Option 2: Vortex GeneratorInstallationonVerticalStabilizerOnly. No changein airspeedmarkings;Supplemental FlightManualnot required.

Aircraftinstallationeffectivityis the sameas listedin Option 1 above.

Option 3: VortexGeneratorInstallationonVerticalStabilizerandWingTop Surface.

A) Standard335,340,340A - FAAApprovedSupplementalFlightManualNo. FM1004datedApril 2, 1991,is required. Theinstallermust determinewhetherthisdesignchangeis compatiblewithpreviouslyapproved modifications.If theholderagreesto permitanotherpersonto usethiscertificateto altertheproduct,theholdershall givetheotherpersonwrittenevidenceof thatpermission.

B) 340and340AIncreasedGrossWeight - Thismodification(STC5A79755W-D)hasbeenfoundto be compatible withSTC5A73825W-D and5A73655W-D. CombinedFAAApprovedSupplementalFlightManualNo.FM1005 datedApril 2, 1991,is required.

FAA Forts 8110-2-1(10-69) Page 3 of 4 This certificatemay be transferred in accordance with FAR 21.47.

xt1te tata f nwrica jrnrtmxtt nf rntzpnrtatrn - xrtI raffon mhüz±rttinn $upp1mixtta1 rtificate (Lrntiniuttiirn $It) SA7975SW-D Dateof Issuance:February27, 1991 Dateof Reissuance:March10,2008 edf d (Continued):

C) 340and340AIncreasedGrossWeightandHorsepower - Thismodification(STCSA7975SW-D)hasbeenfoundto be compatiblewithSTCSA2346SW-D andSA4241SW-D. CombinedFAAApprovedSupplementalFlightManual No.FM100ÔdatedApril2, 1991,is required.

Note: Compatibilityof the combinedmodificationslistedabovewithfuturerevisionsto eitherSTCmust be determined by the installer.Compatibilityof the combinedmodificationswithotherpreviouslyapprovedmodificationsmust be determinedby the installer.If theholderagreesto permitanotherpersonto usethiscertificateto altertheproduct,the holdershallgive the otherpersonwrittenevidenceofthatpermission.

Option 4: VortexGeneratorInstallationonVerticalStabilizerandWing Top Surface.No changein airspeedMarkings;

SupplementalFlightManualnot required.

Aircraftinstallationeffectivityis the sameas listedin Option3 above.

Any alterationof this certificateis punishableby a fineof not exceeding$1,000, or imprisonmentnot exceeding3 years,or both.

FAA Form 8110-2-1(10-69) Page 4 of 4 This certificatemay be transferredin accordance with FAR 21.47.

## Every issue (1)

- March 10, 2008: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/64/9b/649bb177ffb0bfcec1eb296b53efd6e556e1a319a659933babf81057623cebac)

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