# NTSB CHI97LA210: Cessna A188B, N9746G, Aitkin, MN, July 13, 1997 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: July 13, 1997, 14:10 local (19:10 UTC) - Place: Aitkin, MN - Coordinates: 46.530647, -93.708999 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=46.5306&lon=-93.7090&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report December 15, 1997 - Report: Approved by Office Director - NTSB case key (mKey): 10629 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI97LA210 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10629/pdf - Page: https://openairdocs.org/ntsb/CHI97LA210 ## Probable cause loss of engine power for undetermined reason(s). A factor relating to the accident was: the wet/soft terrain in the emergency landing area. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - reason for occurrence undetermined (cause) - Forced landing, emergency landing after takeoff - Nose over, emergency landing - terrain condition - wet (contributing factor) - terrain condition - soft (contributing factor) ## Analysis The pilot said the airplane accelerated normally to climb speed during takeoff. At about 100 feet above ground level (AGL), he noticed that the manifold pressure was low. 'All other engine readings appeared normal. The engine rapidly lost power.' The pilot attempted to land in a hay field adjacent to the airport. During touchdown, the main gear dug into wet/soft ground, and the airplane nosed over. The pilot said, 'Engine power at touchdown was minimal to zero.' Examination of the airplane revealed no anomalies. The pilot said that he could not remember how the switches were configured for takeoff. A note in the Cessna A188B Owner's Manual under HOT WEATHER/HOT ENGINE START (300 Horsepower Engine) stated, 'During a restart after a brief shutdown in extremely hot weather, the presence of fuel vapor may require the auxiliary fuel pump to operate in the 'ON' position for up to 1 minute or more before the vapor is cleared sufficiently to obtain 8 to 10 gallons/hour for starting.' A paragraph in the Cessna A188B Owner's Manual under TAKE-OFF stated, 'With 300 horsepower engines, it is important that the auxiliary fuel pump be turned off for take-off. Otherwise, the mixture will be excessively rich, causing a serious loss in power.' ## Factual narrative On July 13, 1997, at 1410 central daylight time (cdt), a Cessna A188B, N9746G, operated by an airline transport pilot, sustained substantial damage when on initial climb the airplane's engine lost power. The pilot set the airplane down in a field where during the subsequent landing attempt, the airplane nosed over. Visual meteorological conditions prevailed at the time of the accident. The aerial application flight was being conducted under 14 CFR Part 137. A flight plan was not on file. The pilot reported minor injuries. The local flight originated at Aitkin, Minnesota, at 1410 cdt. In his written statement, the pilot said that this was the airplane's second takeoff of the day. The airplane accelerated normally to climb speed during takeoff. At approximately 100 feet above ground level (AGL), the pilot noticed that the manifold pressure was low. "All other engine readings appeared normal. The engine rapidly lost power." The pilot attempted to land in a hay field adjacent to the airport. During the touchdown the airplane's main gear dug into the wet, soft ground. The airplane nosed over on its back. The pilot said, "Engine power at touchdown was minimal to zero." A deputy for the Aitkin County, Minnesota, Sheriff's Department described the wreckage at the scene to a Federal Aviation Administration (FAA) inspector. The airplane's forward fuselage, to include the engine and cowling, was crushed down and rearward. The engine mounts were bent down and aft. The airplane's cockpit was crushed inward. The empennage was crushed down and to the side. The outboard leading edges and upper surfaces of both wings showed skin wrinkling. One of the propeller blades was bent aft. The airplane was moved to Aitkin Airport, Aitkin Minnesota, where flight control continuity was examined and confirmed by an airframe and powerplant mechanic. The airplane's engine was restarted and ran normally. No anomalies were found with the engine controls, or other airplane systems. The FAA inspector spoke to the pilot following the accident. The pilot said that he could not remember how he had his switches configured for takeoff. A note in the Cessna A188B Owner's Manual under HOT WEATHER/HOT ENGINE START (300 Horsepower Engine) states, "During a restart after a brief shutdown in extremely hot weather, the presence of fuel vapor may require the auxiliary fuel pump to operate in the "ON" position for up to 1 minute or more before the vapor is cleared sufficiently to obtain 8 to 10 gallons/hour for starting." A paragraph in the Cessna A188B Owner's Manual under TAKE-OFF states, "With 300 horsepower engines, it is important that the auxiliary fuel pump be turned off for take-off. Otherwise, the mixture will be excessively rich, causing a serious loss in power." ## Aircraft - Registration: [N9746G](https://openairdocs.org/deregistered/N9746G-2015-05-19), registration cancelled 2015-05-19, S/N 18801586T, built 1974 (OpenAirDocs) - Reported make and model: Cessna A188B - Registry model: [Cessna A188B](https://openairdocs.org/model/cessna-a188b) (registry code 2073005) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18801586T - Airframe hours: 3800 - Engines: Continental IO-520-D 300 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Jimair, Inc. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, April 30, 1997, 20 hours before - Departed: AIT - Airport: AIT, Aitkin, runway 34, 3,398 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: center; flight hours: 25,000 total, 1,200 in this make and model, 23,000 as pilot in command, 150 in the last 90 days, 50 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 73 °F - Altimeter: 29.00 inHg - Observed at: AIT, 1 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 19970713018259A](https://openairdocs.org/incident/19970713018259A), Jul 13, 1997: Cessna A188B, Aitkin, MN, Substantial damage. Unable to sustain flight on climbout. Nosed over landing. No ag operating certificate. Gross weight not reported. (-23) on July 13, 1997, at 1410 central… ## Other investigations on N9746G (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 MIA76FKQ11](https://openairdocs.org/ntsb/MIA76FKQ11), Aug 29, 1975: Cessna A188B (N9746G), Minter City, MS, substantial damage 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.