# Accident 20050408006929A: Cessna 172P, Ann Arbor, MI, April 8, 2005

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 8, 2005, 09:40 local time
- Place: Ann Arbor, MI
- Airport: Ann Arbor Municipal Airport
- Damage: Substantial damage
- Phase of flight: Go Round (Aborted VFR)
- Operating rules: General operating rules (Part 91)
- Location: 42.2231° N, 83.7456° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=42.2231&lon=-83.7456&mi=10
- Aircraft: N777UM, registered now (https://openairdocs.org/aircraft/N777UM) (OpenAirDocs)
- Registry model: Cessna 172P (registry code 2072436, https://openairdocs.org/model/cessna-172p) (OpenAirDocs)
- Reported make and model: CESSNA 172P
- Reported engine: LYC O320D2J
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 2,800 total, 1,572 in this make and model, 75 in the last 90 days
- NTSB investigation: [NTSB CHI05CA095](https://openairdocs.org/ntsb/CHI05CA095) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20050408006929A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) DURING TRAINING FLIGHT, ENGINE RPM WOULD NOT REDUCE BELOW APPROXIMATELY 1300 RPM. INSTRUCTOR ATTEMPTED TO LAND AIRCRAFT, BUT COULD NOT REDUCE AIRSPEED SUFFICIENTLY DUE TO HIGH ENGINE RPM. INSTRUCTOR PERFORMED A GO-AROUND AND ENGINE MADE FULL POWER. DURING A 2ND GO-AROUND ATTEMPT, THROTTLE WAS ADVANCED TO FULL POWER SETTING, BUT ENGINE FAILED TO ACCELERATE. AIRCRAFT HIT A FENCE BEYOND THE END OF THE RUNWAY, CLEARED THE FENCE, AND CAME TO REST IN A FIELD JUST EAST OF STATE ST. THE AIRCRAFT WAS SUBSTANTIALLY DAMAGED. DURING A POST-ACCIDENT GROUND RUN, IT WAS FOUND THAT THE ENGINE WOULD NOT IDLE BELOW 1300 RPM OR ACCELERATED PAST 1800 RPM (THROTTLE/MIXTURE CONTROL RIGGING CHECKED GOOD). A COMPRESSION TEST WAS PERFORMED AND #3 CYLINDER WAS FOUND TO BE 44/80 PSI, PRIMARILY LEAKING THROUGH THE PISTON RINGS. WHEN THE CARBURETOR WAS REMOVED, IT WAS FOUND THAT THE ACCELERATOR PUMP DISCHARGE NOZZLE (TUBE) WAS MISSING FROM THE CARBURETOR AIR INLET. THIS TUBE IS PRESSED-FIT INTO THE INLET CASTING DURING ASSEMBLY A SECOND CARBURETOR WAS INSTALLED AND THE ENGINE RAN AT THE PROPER IDLE AND FULL POWER RPM. IT IS ASSUMED THAT THE NOZZLE WAS INGESTED BY THE ENGINE. A MALFUNCTION OR DEFECT REPORT WAS SUBMITTED BY THIS INSPECTOR.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI05CA095](https://openairdocs.org/ntsb/CHI05CA095), Apr 8, 2005: Cessna 172P (N777UM), Ann Arbor, MI, substantial damage. Probable cause: The failure of the carburetor nozzle resulting in loss of engine power and the unsuitable terrain encountered during the forced landing. A factor was the low altitude.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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