# SDR 95ZZZX6142

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N7112V](https://openairdocs.org/aircraft/N7112V), registered now
- Make and model: Mooney M20F
- Registry model: [Mooney M20F](https://openairdocs.org/model/mooney-m20f) (OpenAirDocs)
- Aircraft serial: 220047
- Engine: Lyc IO360A1A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Pipe
- Part number: 78743
- Condition: Cracked
- Location: Nr 3 Cylinder
- Part time: 1,680 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/95ZZZX6142

## Discrepancy

REPLACED PARTS RECEIVED BACK FROM OVERHAUL AGENCY FOLLOWING PROP STRIKE DISASSEMBLY INSPECTIONS, INCLUDED A PN SL-1024J PISTON AND SUBJECT NR 3 CYL INTAKE PIPE.  PISTON EXHIBITED EARLY STAGES OF TYPICAL DETONATION DAMAGE ON THE HEAD, ADJACENT TO ITS O.D., AT THE 12 O'CLOCK POSITION AS INSTALLED.  TPT 678 HRS.  CAUSE APPARENTLY DUE TO EXCESSIVELY LEAN MIXTURES RESULTING FROM AMBIENT AIR ENTERING SUBJECT CRACKED INTAKE PIPE AND ADJ TO ITS CYL MATING END.  CRACK WAS IN THE PIPE'S ATTACHMENT FLARE RADIUS, WAS CLEARLY VISIBLE, & EXTENDED AROUND APPROX 40 PERCENT OF THE PIPE'S DIAMETER.  CYL HAD BEEN REPLACED 67 HRS PREVIOUSLY.

---
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.