# SDR 99ZZZX1034

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N739TD
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Aircraft serial: 17270785
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Tachometer
- Condition: Unapproved Part
- Location: Cockpit
- Part time: 338 hours
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX1034

## Discrepancy

OWNER COMPLAINED OF ENGINE RPM BEING LOW.  CHECKED TACHOMETER WITH TACH-CHECK, FOUND TACH 400 RPM LOW.  SUBMITTER STATED THIS IS THE SECOND TACH LIKE THIS FOUND IN LAST 3 YEARS.  THE ONLY MARKING ON THE TACHOMETER IS 'MADE IN CHINA'.

---
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.