# STC SA4977NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Turbotech, United States
- Description: Relocation of battery or installation of dual battery system.
- Applied: June 26, 1990
- Status date: September 5, 1990
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 5A6](https://openairdocs.org/tcds/5A6)
- Certificate PDF: https://openairdocs.org/files/sha256/64/e3/64e37bda598363e4678f86815e08eb1fdc9eea57ef77d7649114470f2d02293a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D814E2E1F5186A785256CC2000E4014.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4977NM

## ADs that name it (0)

None.

## Approved models (11)

- Cessna Aircraft Company 180 ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180A ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180B ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180C ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180D ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180E ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180F ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180G ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180H ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180J ([TCDS 5A6](https://openairdocs.org/tcds/5A6))
- Cessna Aircraft Company 180K ([TCDS 5A6](https://openairdocs.org/tcds/5A6))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA4977NM This certificate issued to: Turbotech Purt 3 of the CIVIT Air Regulations Original Product -Iype bertificate Number: 5A6 Make: Cessna Model: 180, 180A, 180B, 180C, 180D, 180E, Desorplion fLype Design thange: Relocation of battery or installation of dual 180F, 180G, 180H, 180J, 180K battery system per Turbotech Drawings listed in Report TT-405, dated June 14, 1990, or later FAA approved revision.

Limilation&and binditiApproval of this change in type design applies only to the above model aircraft. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of those other previously approved moditications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate, and Continuation Sheet must be maintained is part of the permanent records for the moditied aircratt. (See Continuation Shee

Datespapplicalim: June 26, 1990 Sute missuerd:

Date of Issuance: September 5, 1990 I ate unended:

FEDERAL AVIATION ( Sigrature) Manager, Seattle Aircraft Certification Office

- (Title)

47.

FAA FoR 8110-2 (10-68)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) NumberSA4977NM Limitations and Conditions: (continued) The Conditions and Limitations of Type Certificate Data Sheet (TCDS) Number 5A6 apply except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of STC SA4977NM, prescribes the conditions and limitations under which the products for which the STC was issued.

meets the airworthiness requirements of the Federal Air Regulations.

Supplemental Type Certificate HOLDER: TURBOTECH Model 180 Series (Normal/Utility Category) as modified by STC SA4977NM Placards: For dual battery installation, the following placards are required:

Adjacent to battery switch:

Battery # 1 (Forward) Battery Selector Switch Battery # 2 (Aft) On instrument panel, in full view of the pilot:

**THIS AIRPLANE IS EQUIPPED WITH TWO BATTERIES**

- Switching between the batteries is accomplished with the selector switch.

- Only one battery may be selected at any time.

- Neither battery will charge unless selected.

- To charge a battery, select that battery with the engine running.

Battery is charged when the ammeter indication drops to a low value.

- During flight, each battery should be selected for at least 20 minutes if possible. (Longer if battery is excessively drained.)

- Starting may be accomplished with either battery selected.

- With alternator inoperative, switching batteries will cause a momentary disruption in electrical power and may cause some avionics to reset.

- END-

47.

## Every issue (1)

- September 5, 1990: Issued, Current. [certificate](https://openairdocs.org/files/sha256/64/e3/64e37bda598363e4678f86815e08eb1fdc9eea57ef77d7649114470f2d02293a)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.