# NTSB LAX98LA183: Cessna 172H, N2573L, Mariposa, CA, June 5, 1998 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: June 5, 1998, 14:40 local (21:40 UTC) - Place: Mariposa, CA - Coordinates: 37.490562, -119.99971 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=37.4906&lon=-119.9997&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 2 serious - Status: Completed, report August 3, 1999 - Report: Approved by Office Director - NTSB case key (mKey): 30108 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX98LA183 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/30108/pdf - Page: https://openairdocs.org/ntsb/LAX98LA183 ## Probable cause Fuel exhaustion due to the pilot's inadequate preflight planning, and improper in-flight decision not to make a precautionary landing for additional fuel. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - nonmechanical, cruise - normal - fluid,fuel - exhaustion - aircraft preflight - improper, pilot in command (cause) - refueling - not performed, pilot in command (cause) - fuel supply - inadequate, pilot in command (cause) - in-flight planning/decision - improper, pilot in command (cause) - precautionary landing - not performed, pilot in command (cause) - Forced landing, descent - emergency - In flight collision with object, emergency descent/landing - object - tree(s) (contributing factor) ## Analysis The day before the pilot's flight he checked his airplane and determined that its right fuel tank was full of fuel, and the left tank was 'down 2 to 3 gallons.' The following morning a preflight inspection was performed, no fuel was added, and the pilot took off from Mariposa, California. After flying about 1:20 hours, the pilot landed at Bakersfield and ate lunch. Thereafter, he took off for a return flight to Mariposa. En route, the pilot cruised at 6,500 feet msl and overflew Fresno, a community with several airports. The pilot observed the airplane's fuel gauges, switched tanks, and continued heading toward Mariposa. About 35 miles past Fresno, all engine power was lost. A ground-based witness heard the pilot transmit a distress call indicating that he was out of fuel. The pilot attempted to make a forced landing on a highway, but on approach collided with trees. No evidence of any preimpact mechanical malfunction or failure was found during an examination of the airplane. Fuel system continuity was established, with no ruptures evident to any line or tank. The FAA reported that the amount of fuel observed remaining in the fuel tanks was less than 1 gallon and was in the unusable range. A few drops of fuel were observed in the gascolator. The pilot stated that the accident could have been prevented had he refueled (before departure) at Bakersfield. ## Factual narrative HISTORY OF FLIGHT On June 5, 1998, about 1440 hours Pacific daylight time, a Cessna 172H, N2573L, operated by the pilot, experienced a total loss of engine power while cruising near Mariposa, California. During the pilot's forced landing about 2 miles south of the uncontrolled Mariposa-Yosemite Airport, the airplane collided with trees and was substantially damaged. The private pilot and passenger were seriously injured. Visual meteorological conditions prevailed and no flight plan was filed. The flight originated from an undetermined airport in the Bakersfield, California, area about 1400. In the pilot's report he reported that on June 4, 1998, he checked his airplane and determined that its right fuel tank was full, and the left tank was "down 2 - 3 gallons." The following morning a preflight inspection was performed, and no fuel was added. The pilot took off either "shortly after 10 o'clock" or at 1054 according to the airport's logs. The pilot stated that he flew for 1:20 hours, and landed at Bakersfield where he had lunch. Thereafter, the pilot and passenger took off for their return flight to Mariposa. The pilot did not report his departure time. He stated that while en route, he flew over Fresno at 6,500 feet mean sea level and switched fuel tanks. After flying for an additional 35 miles the engine quit, and he landed on Highway 140. The pilot and passenger and a ground-based witness were subsequently interviewed by officers from the California Highway Patrol (CHP) which provided the following additional pertinent information: (1) Passing Fresno, the fuel quantity was observed becoming low, and the right fuel tank was selected; (2) At the time, the right fuel tank's gauge indicated it was about 1/4 full; (3) After all engine power was lost, a ground-based witness heard a pilot transmit a distress call indicating that he was out of fuel; (4) During the flight between Mariposa and Bakersfield, the engine was operated at a higher than normal rpm to facilitate seating the newly installed rings and valves; and (5) The airplane's log contained a notation dated 6/5/98 with the remarks "Rings & Valves." PERSONAL INFORMATION The pilot reported that his total flight time was about 2,979 hours. He had flown the Cessna 172 for 56 hours, and his last biennial flight review was performed in a Cessna 172H. The passenger was issued a student pilot certificate on January 15, 1998. At that time, he also applied for a third-class aviation medical certificate. The examining physician declined to issue the requested medical certificate. AIRPLANE AND WRECKAGE AND IMPACT INFORMATION The Federal Aviation Administration (FAA) coordinator and the participant from the Cessna Aircraft Company examined the airplane. Neither party reported observing evidence of any preimpact mechanical malfunction. The FAA reported that the integrity of the fuel tanks, caps, and lines was established. The right and left fuel tanks were found empty, except for a small quantity of fuel present along the tanks' leading edge. A few drops of fuel were observed in the gascolator. The FAA verbally reported that the amount of fuel observed remaining in the fuel tanks was less than 1 gallon and this quantity was in the unusable range. According to the Cessna Aircraft Company, the airplane was equipped with standard 39-gallon capacity fuel tanks. In all flight attitudes, 36 gallons of fuel are considered usable. ADDITIONAL INFORMATION The pilot indicated in his report that no mechanical malfunctions or failures were experienced during the flight. Also, he reported that the accident could have been prevented had he refueled (before takeoff) at Bakersfield. ## Aircraft - Registration: [N2573L](https://openairdocs.org/deregistered/N2573L-2011-07-20), registration cancelled 2011-07-20, S/N 17255773, built 1967 (OpenAirDocs) - Reported make and model: Cessna 172H - Registry model: [Cessna 172H](https://openairdocs.org/model/cessna-172h) (registry code 2072424) (OpenAirDocs) - Registry engine: [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series) (registry code 17022, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 17255773 - Engines: Continental O-300-D 145 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Thomas R. Wentworth - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 10, 1997 - Departed: NA, BAKERSFIELD, CA - Destination: 068 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: right; flight hours: 2,979 total, 56 in this make and model, 2,705 as pilot in command, 4 in the last 90 days, 3 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 5 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 77 °F ## 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 19980605020749A](https://openairdocs.org/incident/19980605020749A), Jun 5, 1998: Cessna 172H, Mariposa, CA, Substantial damage. During descent into O68 ran out of fuel. Tried land on highway. But wing hit a tree. Crashed on shoulder I40 (-23) on 06/05/1998 at approximately 1630 hours… 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.