# STC ST497CH

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Monogram Systems, United States
- Description: Installation of Envirovac toilets P/N 7900101 (L/H) and P/N 7900102 (R/H)
- Applied: December 15, 1995
- Status date: May 26, 2009
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS T00001SE](https://openairdocs.org/tcds/T00001SE)
- Certificate PDF: https://openairdocs.org/files/sha256/aa/83/aa83962589821466d3acdf9c399e0a04cc98c30f223e2933e72cc56c38eb9651
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/91B0BAB4B47AE344862576000070720F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST497CH

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 777-200 Series ([TCDS T00001SE](https://openairdocs.org/tcds/T00001SE))

## 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.

Part 25 of the Federal Aviation Regulations. (See Type Certificate Data Sheet T00001SE for complete certification basis.)

Installation of Envirovac toilets P/N 7900101 (L/H) and P/N 7900102 (R/H) installed per EVAC Supplement to Boeing 777 Maintenance Manual 38-32-01, Pages 401-412, no revision, dated December 13, 1995, or later FAA Approved revision.

1) Compatibility of this design change with previously approved modifications must be determined by the 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.

Monogram Systems 1500 Glenn Curtiss Street Carson, CA 90746-4012 T00001SE Make : Boeing Company

777-200 Series Date of application : December 15, 1995

Date of issuance : April 12, 1996

Date reissued : June 20, 1006, August 8, 2006, May 26, 2009

( Signature) Roy E. Boffo, III Acting Branch Manager, Systems and Flight Test Branch Chicago Aircraft Certification Office

( Title)

## Every issue (2)

- May 26, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/aa/83/aa83962589821466d3acdf9c399e0a04cc98c30f223e2933e72cc56c38eb9651)
- August 8, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/1a/c8/1ac84b65694812b3fa072b7d6cb1c22a7409f79be211eb99e338dfd537382496)

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