# STC SH2389NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Croman Corporation, United States
- Description: Installation of an Electronics International Digital Temperature Indicator with related thermocouples, adapters and harness to monitor the temperature fo the main gear box bearings.
- Applied: November 10, 1983
- Status date: November 10, 1983
- Product: Aircraft
- Certification basis: Part 21
- Data sheets: [TCDS H2EA](https://openairdocs.org/tcds/H2EA)
- Certificate PDF: https://openairdocs.org/files/sha256/b3/6b/b36b417f74ec25aef21ea7e69ba75db9702fea004665e7c5289bd5baaba1ae2f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3E545F135255779E862579D60061B82D.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH2389NM

## ADs that name it (0)

None.

## Approved models (1)

- Sikorsky Aircraft Corporation S-61A ([TCDS H2EA](https://openairdocs.org/tcds/H2EA))

## 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 SH2389NM This certificate issued to: Croman Corporation Part 21.25 of the Federal Aviation Regulations:

Original Product Type bertificate Nunter: H2EA Make Sikorsky Model: S-6 1A Description of Type Design Change:

Installation of an Electronics International Digital Temperature Indicator with related thermocouples, adapters and harness to monitor the temperature of the main gear box bearings in accordance with Croman Corporation Drawing No. S61-5000, Sheets 1 through 4, dated April 22, 1984, or later FAA approved revision. This installation supplements the existing main gear box oil temperature monitoring Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation of the Electronics International Digital Temperature Indicating System on Sikorsky Model S-61A Helicopter, Serial Number 61094, R/N N318Y, only. The modified rotorcraft must be operated in accordance with an FAA approved copy of the Rotorcraft Flight Manual dated May Il, 1984, or later FAA approved revision.

A copy of this certificate and the Rotorcraft Flight Manual Supplement must be carried in the rotorcraft at all times.

Date of Application: November 10, 1983 Dute missued:

Date of Issuance: . May 11, 1984 Date Amended:

FEDERAL AVIATION stralor (Signalure) Acting Manager, Seattle Aircraft Certification Offic (Title)

47.

## Every issue (1)

- November 10, 1983: Issued, Current. [certificate](https://openairdocs.org/files/sha256/b3/6b/b36b417f74ec25aef21ea7e69ba75db9702fea004665e7c5289bd5baaba1ae2f)

---
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.