# NTSB CHI96LA132: Siai-Marchetti S.205/22R, N954W, Anoka, MN, April 13, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 13, 1996, 13:35 local (18:35 UTC) - Place: Anoka, MN - Coordinates: 45.209995, -93.389442 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.2100&lon=-93.3894&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report May 29, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 10229 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI96LA132 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10229/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=10229 - Page: https://openairdocs.org/ntsb/CHI96LA132 ## Probable cause A loose exhaust system that had become disconnected and blocked, which resulted in partial loss of engine power. ## 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, climb - exhaust system,manifold/pipe - loose (cause) - exhaust system,baffle - disconnected (cause) - exhaust system,stack - blocked(total) (cause) - Forced landing, descent - emergency - In flight collision with object, emergency landing - object - wire,transmission - object - vehicle - wheels up landing - performed, pilot in command - In flight collision with terrain/water, emergency landing - terrain condition - roadway/highway ## Analysis The pilot said that just after takeoff, the airplane 'lost partial power and would climb only very slowly.' He began a slow left turn in an attempt to return to the airport and land on a perpendicular runway. Following the turn, the pilot determined that the airplane could no longer maintain altitude. He elected to perform a gear-up forced landing on a road. The airplane struck a power line and two vehicles before impacting on the road. Examination of the wreckage revealed that the left muffler baffle had broken loose from the muffler and was blocking the exhaust stack. All three of the right side engine exhaust pipes were found loose and leaking at the cylinder heads. ## Factual narrative On April 13, 1996, at 1335 central daylight time (cdt), a Siai- Marchetti, S.205/22R, operated by a private pilot, sustained substantial damage when during initial climb, the airplane's engine lost power. The airplane subsequently impacted on a road. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under 14 CFR Part 91. A VFR flight plan was on file. The pilot and passenger reported no injuries. The flight originated at Anoka, Minnesota, and was en route to Mandan, North Dakota. In his written statement, the pilot said that just after takeoff, the airplane "lost partial power and would climb only very slowly." He began a slow left turn in an attempt to return to the airport and land on the perpendicular runway. Following the turn, the pilot determined that the airplane could no longer maintain altitude. The pilot elected to perform a gear-up forced landing on a road. The airplane struck a power line and two vehicles before impacting on the road. The Federal Aviation Administration (FAA) inspector who examined the wreckage at the scene found the airplane resting upright on a road. There was damage to the underside of the fuselage just aft of the right wing root. There was crush damage to the outboard two feet of the right wing along the leading edge. The left wingtip had been sheared off and the wing was bent in from the leading edge to the spar. The propeller exhibited tip bending. Flight control continuity was confirmed. All other systems, with exception of the engine, revealed no anomalies. Examination of the engine revealed that the left muffler baffle had broken loose from the muffler and was blocking the exhaust stack. All three of the right side engine exhaust pipes were found loose and leaking at the cylinder heads. ## Aircraft - Registration: [N954W](https://openairdocs.org/deregistered/N954W-2013-05-23), registration cancelled 2013-05-23, S/N 4-154, built 1968 (OpenAirDocs) - Reported make and model: SIAI-MARCHETTI S.205/22R - Registry model: [Siai-Marchetti S.205/22R](https://openairdocs.org/model/siai-marchetti-s-205-22r) (registry code 8120412) (OpenAirDocs) - Registry engine: [Franklin 6A-350SER](https://openairdocs.org/engine/franklin-6a-350ser) (registry code 27023, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 4-154 - Airframe hours: 919 - Engines: FRANKLIN 6A-350-C2 220 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Arthur Devries/James Devries - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 24, 1995, 94 hours before - Departed: ANE - Destination: Y19, MANDAN, ND - Flight plan: VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 177 total, 20 in this make and model, 125 as pilot in command, 20 in the last 90 days, 7 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 10° at 10 knots - Visibility: 15 statute miles - Lowest ceiling: 1,500 ft overcast - Altimeter: 30.00 inHg - Observed at: MIC, 11 nm away ## 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 19960413007209A](https://openairdocs.org/incident/19960413007209A), Apr 13, 1996: Mrchti S20522R, Minneapolis, MN, Substantial damage. Lost power on climbout. Landed gear up on highway. Loose baffle and plug in muffler caused improper back pressure. (-23) on April 13, 1996 at 1830 gmt, a… ## Docket (2 files) The files NTSB released with the investigation on May 3, 1996, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=10229. 644 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 556 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40424988&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Supplement S (item 2, .PDF, 88 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40046232&FileExtension=.PDF&FileName=Supplement%20S-Master.PDF 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.