# STC SA3151WE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Aero Union Corporation, United States
- Description: Installation of 3000 gallon external retardant tanks under the fuselage at the wing center section.
- Applied: January 6, 1976
- Status date: February 27, 1976
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-781](https://openairdocs.org/tcds/A-781)
- Certificate PDF: https://openairdocs.org/files/sha256/73/49/734912673b9c1f77c7b93204e3ac7ec7934953d9f3f688cc9b65ecdc9fb7abdd
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/181C72BC2EC7389686257B0500582292.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3151WE

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company DC-6 ([TCDS A-781](https://openairdocs.org/tcds/A-781))

## 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.

Brparrmcnr of l:ransportarion -federal Slniation Sldministration ~upplcmcntal 1Igpc <tcrtiftcatc /~~/h~///u.chany~,~·n>i'/u~L'y/u:~.Jjt..v/<>?<-.d.e/~ouq:n,?ji~.uxdUU-~>mi{u'<~•n.:J·Al;u/~"'·n~/,;..;...:;

.//~Jn....M./.df'u~~Ud'k~<-n-/m-«14·.d.e-~?<u.~.i-ne.i.V~ru'~u?Unfj/~f!J1:M 4 a & bcj.//w Civil .Air ~r£u"~"n.t' and A'Tlendrnent 4-1 effective November 1, 1946 4md.~du<£-.~&~/ea~v~nk?<-: A781 Jtzk: McD:mnell D::mglas Ji.dd: OC-6 q~c-Jib~m·~JyjuY~~jn ffkn,f-&: Installation of 3000 gallon external reta!'d::h'1t t~.ks under the fuselage at the ~ring center section. Modification must be in accord~.ce with FAA sealed Aero Union Drawing List No. 6-3100 Revision "B" or later F.A.A approved reVlslons. Loading must be in accordance with Aero Union Report HBS o:,-6 "Loading Schedule Supplement" and operation must be in accordance V~d.th FA..A a-::m:-:::-:ed /lirplane Flight t'lanual Supplement dated Feb. 27, 1976 or later FAA approve; G.

revisions.

-.£;nda/t£-n.i·..a.n.d-6;'7w0~:rr?W : The approval of this change in type design applies basically to DC-6 airplanes only. This approval should not be extended to ct~e~ aircraft of ti'..is r.1odel on which other previously approved modifications &r'2 incorporated unless it is determined by the installer that the interrel&tic~sr~;

between this change aTJ.d any of those other pre\riously approved modifications :·,-:..._ introduce no adverse effect upon the airworthLTJ.ess of that aircraft.

~·..u#"eaiL.-and.l'h~..-"'Y0<-N'i·~~".d:z/o.u.~~..Gvb"uL'oa.J~;:""~/'/VN>Va/M.a/~1'Cm.a~:n,..<nA'jJ~I'.anu/.-.ur­ ~,.u:L-.~ ..a.u.yi.-n~~~~'~'<'t-<ku/, P,~<-.-a~IL ... n-wuu"unv.daib~ ~""'~oiib~ud /_y Uu .':£/m~:niJim/n, <j //,~ ( ill It'/ A nr alteration of this urt1{icatt is punishablt b) a fint of not rxcudmg $1 .000, or lmjJrzsonment m,t txceedme. :1 J fllT.l, '1' ""'' ·_ TJus Cl!ril~hca!, ma·y he JronJf"ennf ir? £U.cmdtuta 1f"!tlt FA P.. ~-} ..; -

/ ,;,:5!- •"' { . --· . 2-/77 . -

**CERTIFICATE, OR SUPPLEMENTAL TYPE CERTIFICATE**

• NAME AND ADDRESS OF APPLICANT 2. APPLICATION MADE FOR: 3. PRODUCT INVOLVED

AERO UNION CORPORATION Chico Municipal Airport TYPE CERTIFICATE De AIRCRAFT Chico, California 95926

**PRODUCTION CERTIFICATE ENGINE X SUPPLEMENTAL T. C. PROPELLER**

4. COMPLETE THE FOLLOWING FOR TYPE CERTIFICATE A. MODEL DESIGNATION(S) (All models listed are to be completely described in the required technical data, including drawings, representing the design, material, specifications, construction, and performance of the Aircraft, Aircraft Engine, Propeller which is the subject of this application.)

5. COMPLETE THE FOLLOWING FOR PRODUCTION CERTIFICATE (With this form submit, in manual fonn, one copy of quality control data or changes thereto covering new products, as required by applicable FAR.)

A. FACTORY ADDRESS (If different from 1 above) - ""·APPLICATION IS FOR: 0 NEW P.C. 0 ADDITIONS TO P.C. NO.

c. APPLICANT IS HOLo::>ER OF OR A LICENSEE UNDER T. C. OR S.T.C. NO. (attach evidence of licensing alireement)

6. COMPLETE THE FOLLOWING FOR SUPPLEMENTAL TYPE CERTIFICATE A. MAKE AND MODEL DESIGNATION DF PRODUCT TO BE MODIFIED Douglas DC-6 B. DESCRIPTION OF MODIFICATION Installation of external retardant tank under the fuselage.

C. WILL. DATA BE AVAILABLE: F='OR SALE OR RELEASE TO OTHER PERSONS?

0 YES [ZJNO D. WILL PARTS BE MANUFACTURED FOR SALE? (Ref. FAR 21.303) 0 YES ~NO

**CERTIFICATION**

I CERTIFY THAT THE ABOVE STATEMENTS ARE TRUE /}.rei//.· ./ U ~~ 1 /<./t-p1-tfi1·~ S1--fTURE OF CERTI FVING OFFICIAL 6 January 1976 Agent DATE Tl TLE

- ·- FAA Form 8110.12 tS-69) FORMERLY FAA FORM 312.

GPO Q7S. 051!

## Every issue (1)

- February 27, 1976: Issued, Current. [certificate](https://openairdocs.org/files/sha256/73/49/734912673b9c1f77c7b93204e3ac7ec7934953d9f3f688cc9b65ecdc9fb7abdd)

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