ASN Wikibase Occurrence # 280450
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| Date: | Saturday 16 July 2022 |
| Time: | 18:17 LT |
| Type: |  Socata TB21 Trinidad TC GT |
| Owner/operator: | |
| Registration: | N718TB |
| MSN: | 2128 |
| Year of manufacture: | 2002 |
| Total airframe hrs: | 634 hours |
| Engine model: | Lycoming TI0-540 SER |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Marcos, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | San Diego-Montgomery-Gibbs Executive Airport, CA (MYF/KMYF) |
| Fullerton Municipal Airport, CA (FUL/KFUL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, he had just picked up the airplane after an annual inspection. He conducted a pattern-only flight before departing for a cross-country flight to reposition the airplane. About 30 minutes after takeoff, there was a total loss of engine power and the pilot performed a forced landing on a road. The airplane struck a vehicle during landing, which separated the left wing from the fuselage.
Postaccident examination of the engine revealed the mechanical fuel pump shaft had sheared. Further disassembly revealed rotational scoring, heat discoloration, and foreign (aluminum) debris on the pump's rotor shaft and bearing bore. The scoring and heat discoloration were determined to have occurred due to friction occurring between the rotor shaft and bearing bore. Mechanical damage to the affected components did not allow for the determination of pre-event component measurements, including the rotor shaft or the bearing dimensions.
The mechanical fuel pump was a recently rebuilt unit and was installed on the engine during the annual inspection that was completed five days before the accident. The overhaul procedures for the fuel pump specify the bearing to be honed and the rotor to be lubricated during reassembly. Honing to incorrect dimensions or improper lubrication would likely result in increased friction between the two components. Debris between the rotor and bearing could also increase friction. The rubber seal installed at the driven end of the rotor exhibited softening and deformation consistent with thermal distress, which could have allowed debris to enter the fuel pump after the pump began to overheat. Additionally, debris could have been introduced during the rebuild process or during the installation process through the fuel line ports and fittings, but due to the friction damage the source of the debris could not be identified. The fuel pump shaft sheared due to the friction between the rotor shaft and bearing bore; however, damage prevented determination of the source of the friction.
Probable Cause: The failure of the mechanical fuel pump due to internal friction for reasons that could not be determined based on available evidence, which resulted in a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB WPR22LA259
FAA register: https://registry.faa.gov/aircraftinquiry/Search/NNumberResult?NNumbertxt=718TB
https://flightaware.com/live/flight/N718TB/history/20220717/0125Z/KMYF/L%2033.10367%20-117.22575
Location
Media:
BREAKING: A Cessna made an emergency landing on Rancho Santa Fe Road in San Marcos, according to the San Marcos Fire Department. https://t.co/8sfCYl5lqQ
— NBC 7 San Diego (@nbcsandiego) July 17, 2022
Plane makes emergency landing onto surface streets in San Marcos https://t.co/1IMzusLFb5
— CBS Los Angeles (@CBSLA) July 17, 2022
Just witnessed an airplane land/crash on Rancho Santa Fe Road & Melrose pic.twitter.com/dvBru70mBf
— Robert Wade (@EncinitasRob) July 17, 2022
Small Plane Makes Emergency Landing at Busy San Marcos Intersection https://t.co/fCHpGrewAJ
— Omari Fleming (@OmariNBCSD) July 17, 2022
Emergency Landing - San Marcos - #MeadowlarkIC
— SD County Fire Scanner (@SDCountyFires) July 17, 2022
Northbound Rancho Santa Fe Rd from Melrose Dr and Boulderidge Dr from Broadacres Way will be shut down for an extended duration. 1 patient has been transported to the hospital.https://t.co/jx4sCw3S6f
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Jul-2022 05:14 | gerard57 | Added |
| 17-Jul-2022 05:47 | harro | Updated [Aircraft type, Cn, Departure airport, Source] |
| 17-Jul-2022 06:56 | RobertMB | Updated [Time, Aircraft type, Source, Damage, Narrative] |
| 17-Jul-2022 07:52 | Aerossurance | Updated [Location, Embed code] |
| 17-Jul-2022 07:52 | Aerossurance | Updated [[Location, Embed code]] |
| 17-Jul-2022 07:54 | Aerossurance | Updated [Embed code] |
| 17-Jul-2022 07:55 | Aerossurance | Updated [Embed code] |
| 18-Jul-2022 17:02 | RobertMB | Updated [Total occupants, Embed code, Narrative] |
| 19-Jul-2022 06:31 | AgOps | Updated [Embed code, Category] |
| 30-Jul-2022 16:34 | AgOps | Updated [Total occupants, Narrative] |
| 09-Aug-2022 18:39 | Captain Adam | Updated [Time, Destination airport, Source, Narrative] |
| 28-Apr-2024 09:46 | ASN Update Bot | Updated [Time, Operator, Total occupants, Other fatalities, Destination airport, Source, Embed code, Narrative, Accident report] |
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