# NTSB CHI05CA095: Cessna 172P, N777UM, Ann Arbor, MI, April 8, 2005 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: April 8, 2005, 09:20 local (13:20 UTC) - Place: Ann Arbor, MI - Coordinates: 42.223056, -83.745552 - Nearby events: https://openairdocs.org/map.md?lat=42.2231&lon=-83.7456&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report July 7, 2005 - Report: Approved by Office Director - NTSB case key (mKey): 61428 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI05CA095 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61428/pdf - Page: https://openairdocs.org/ntsb/CHI05CA095 ## 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. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, go-around (vfr) - fuel system,nozzle - failure (cause) - Forced landing, emergency landing after takeoff - In flight collision with terrain/water, emergency landing after takeoff - altitude - low (contributing factor) - unsuitable terrain or takeoff/landing/taxi area - encountered (cause) ## Analysis The airplane was damaged during a forced landing following a loss of engine power during a go-around. Engine runs subsequent to the accident revealed that the engine would run rough when advanced to 1,400 rpm. The engine operated throughout it's operational rpm range when fitted with a carburetor from another airplane. The accident carburetor was found to be missing the accelerator pump nozzle tube. No other discrepancies were noted. ## Factual narrative On April 8, 2005, about 0920 eastern daylight time, a Cessna 172P, N777UM, piloted by a student pilot and certified flight instructor (CFI), was substantially damaged during a forced landing following a loss of engine power during an attempted go-around from runway 06 (3,500 feet by 75 feet, concrete), at the Ann Arbor Municipal Airport, Ann Arbor, Michigan. The 14 CFR Part 91 training flight was operating in visual meteorological conditions without a flight plan. Neither the CFI nor student were injured. The local flight originated about 0755. The CFI stated that a go-around was executed due to excessive speed during the landing approach. He stated that upon throttle advancement, the engine lost power resulting in the forced landing. A postaccident examination of the airplane was conducted. Engine runs subsequent to the accident revealed that the engine would run rough when advanced to 1,400 rpm. A carburetor from another Cessna 172 was mounted on the accident airplane. With this carburetor, the engine was able to be advanced to 2,700 rpm and the engine operation throughout the rpm range was normal. Examination of the accident carburetor revealed that the accelerator pump nozzle tube was missing. No other discrepancies were noted. ## Aircraft - Registration: [N777UM](https://openairdocs.org/aircraft/N777UM), registered now, S/N 17275405 (OpenAirDocs) - Reported make and model: Cessna 172P - Registry model: [Cessna 172P](https://openairdocs.org/model/cessna-172p) (registry code 2072436) (OpenAirDocs) - Category: Airplane - Serial number: 17275405 - Engines: Textron Lycoming O-320 160 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: University Michigan Flyers - Airworthiness certificate: Standard, Normal - Departed: ARB, Ann Arbor, MI - Destination: Ann Arbor, MI ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 28; injuries: none; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 2,800 total, 1,572 in this make and model ## Weather - Conditions: Visual (VMC), Day ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20050408006929A](https://openairdocs.org/incident/20050408006929A), Apr 8, 2005: Cessna 172P, Ann Arbor, MI, Substantial damage. (-23) During training flight, engine RPM would not reduce below approximately 1300 RPM. Instructor attempted to land aircraft, but could not reduce airspeed… 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. --- 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.