# NTSB LAX94LA104: Beech 58, N1082W, Modesto, CA, January 25, 1994 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: January 25, 1994, 11:00 local (19:00 UTC) - Place: Modesto, CA - Location: 37.6258° N, 120.9544° W: Placed by OpenAirDocs at MODESTO CITY-COUNTY-HARRY SHAM FLD (MOD), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=37.6258&lon=-120.9544&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report November 14, 1994 - Report: Approved by Office Director - NTSB case key (mKey): 28645 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX94LA104 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/28645/pdf - Page: https://openairdocs.org/ntsb/LAX94LA104 ## Probable cause THE PILOT'S FAILURE TO PERFORM THE EMERGENCY LANDING GEAR EXTENSION AND OTHER MAINTENANCE PERSONNEL'S INADEQUATE 100-HOUR INSPECTION. THE PARTIAL ELECTRICAL FAILURE AND THE PILOT APPREHENSION/ANXIETY DUE TO A POSSIBLE ELECTRICAL FIRE WERE FACTORS IN THIS ACCIDENT. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, climb - to cruise - electrical system - failure,partial (contributing factor) - electrical system,battery - corroded (contributing factor) - maintenance,100-hour inspection - inadequate, other maintenance personnel (cause) - Main gear collapsed, landing - roll - emergency procedure - not performed, pilot in command (cause) - anxiety/apprehension, pilot in command (contributing factor) ## Analysis THE AIRPLANE EXPERIENCED ELECTRICAL PROBLEMS SHORTLY AFTER DEPARTING THE AIRPORT IN INSTRUMENT METEOROLOGICAL CONDITIONS. THE ELECTRICAL PROBLEMS RENDERED THE COMMUNICATIONS, NAVIGATION, AND MOST OF THE ELECTRICAL INSTRUMENTS INOPERABLE. THE PILOT CONTINUED TOWARD THE DESTINATION AIRPORT. THE PILOT ENCOUNTERED VMC CONDITIONS ABOUT 39 MILES NORTHWEST OF THE DESTINATION AIRPORT. THE PILOT DID NOT MANUALLY LOWER THE LANDING GEAR BEFORE ENTERING THE TRAFFIC PATTERN AT THE DESTINATION AIRPORT. HE ELECTRICALLY EXTENDED THE LANDING GEAR WHEN ON THE DOWNWIND LEG. HE HEARD THE LANDING GEAR GO DOWN, BUT THE LANDING GEAR DOWN LIGHT DID NOT ILLUMINATE. THE LANDING GEAR COLLAPSED DURING THE LANDING ROLL-OUT. EXAMINATION OF THE AIRPLANE DISCLOSED THAT ONE OF THE BATTERY'S POSITIVE LEADS WAS CORRODED. A MECHANIC HAD PERFORMED A 50-HOUR INSPECTION ABOUT 37 1/2 FLIGHT HOURS PRECEDING THE ACCIDENT. ## Factual narrative On January 25, 1994, about 1100 hours Pacific standard time, a Beech BE-58, N1082W, landing gears collapsed during landing on runway 28R at Harry Sham Field, Modesto, California. The pilot was conducting an instrument flight rules (IFR) personal flight to Modesto. The airplane, registered to and operated by the pilot, sustained substantial damage. The certificated private pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed. The flight originated at San Francisco International Airport, San Francisco, California, about 1030 hours. The pilot submitted a Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1/2. In the report, he said that shortly after departing San Francisco, under instrument meteorological conditions, the airplane began to experience electrical problems. These conditions rendered the communications, navigation radios, and most of the electrical instruments inoperable. The pilot could hear some instructions from the radar sector controller, but could not respond. He was aware that visual meteorological conditions prevailed at the destination airport and he proceeded towards the airport. The airplane encountered visual meteorological conditions between Livermore and Tracy, California, about 39 miles northwest of Modesto. He entered the traffic pattern, but did not observe the local controller flash a green light for landing. The local controller did so, but the pilot did not see it due to his extended downwind leg. The pilot heard the gear go down as he extended it electrically, but the landing gear down light did not illuminate. He thought that the electrical problem caused the light not to illuminate. The airplane landed on the runway. After rolling out about 75 yards, the landing gear collapsed. The pilot said that he thought about manually extending the landing gear, but was concerned about an imminent electrical fire. His thoughts were to get the airplane on the ground. The pilot also indicated in the accident report that a mechanic had performed a 50-hour inspection 37 1/2 hours preceding the accident. Mr. Tom Rouch, Top Gun Aviation, Inc., said in a telephone interview conducted on June 6, 1994, that he repaired the airplane. During the maintenance repair, he found one of the battery's positive leads extremely corroded. This condition caused an open circuit in the electrical system. ## Aircraft - Registration: N1082W (not matched to a registry record) - Reported make and model: BEECH 58 - Category: Airplane - Serial number: TH-324 - Engines: CONTINENTAL IO-520-C 285 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Barber, Bryan A., M.D. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 10, 1993 - Departed: SFO, SAN FRANCISCO, CA - Flight plan: IFR - Airport: MOD, Harry Sham Field, runway 28R, 5,911 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 60; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 667 total, 285 in this make and model, 328 as pilot in command, 28 in the last 90 days, 5 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 100° at 7 knots - Visibility: 15 statute miles - Lowest ceiling: 7,000 ft broken - Temperature: 50 °F, dew point 45 °F - Altimeter: 29.00 inHg - Observed at: MOD ## 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 19940125000849A](https://openairdocs.org/incident/19940125000849A), Jan 25, 1994: Beech 58, Modesto, CA, Substantial damage. Lost electrical power en route IFR. Unsafe gear for landing. Collapsed landing. Battery lead severely corroded. 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.