# NTSB WPR25LA059: Boeing A75N1(PT17), N9199R, El Cajon, CA, December 8, 2024

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: December 8, 2024, 13:30 local (21:30 UTC)
- Place: El Cajon, CA
- Coordinates: 32.826222, -116.97244 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.8262&lon=-116.9724&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 199407
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR25LA059
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/199407/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=199407
- Page: https://openairdocs.org/ntsb/WPR25LA059

## Probable cause

The pilot’s inability to maintain directional control during landing with a flat tire.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Boeing A75N1(PT17), 27 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=1380134), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Boeing A75N1(PT17), 33 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=1380134), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Landing gear system: tube](https://openairdocs.org/ntsb-findings/01023245): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Boeing A75N1(PT17), 1 case](https://openairdocs.org/ntsb-findings/01023245/cases.md?model=1380134), [All aircraft, 19 cases](https://openairdocs.org/ntsb-findings/01023245/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing-landing roll: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [Boeing A75N1(PT17), 2 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=1380134), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md)
- [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Boeing A75N1(PT17), 32 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=1380134), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)
- [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Boeing A75N1(PT17), 14 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=1380134), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md)
- [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Boeing A75N1(PT17), 22 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=1380134), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md)

## Analysis

The pilot of the tailwheel equipped airplane reported that during a formation takeoff, the airplane began to veer left, and he lifted off earlier than the lead airplane to maintain directional control. After an uneventful flight, during landing, the airplane began to track violently to the left, despite the pilot’s control inputs. The airplane exited the left side of the runway, and as it was almost stopped, veered to the right onto the runway surface, and came to rest upright. During the accident sequence, the lower left wing struck the ground, which resulted in substantial damage to the left aileron. Upon exiting the airplane, the pilot observed the left main tire was deflated and partially separated from the wheel assembly. Inspection of the runway environment revealed that there was a thick skid mark from where the airplane’s left tire touched down at the beginning of the runway.

## Aircraft

- Registration: [N9199R](https://openairdocs.org/aircraft/N9199R), registered now, S/N 75-2212, built 1941 (OpenAirDocs)
- Reported make and model: BOEING A75N1(PT17)
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Lycoming R680-17](https://openairdocs.org/engine/lycoming-r680-17) (registry code 42404, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-2212
- Year built: 1941
- Engines: Lycoming R680-17/B4E 225 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Airport: SEE, Gillespie Fld, runway 09L/27R, 5,342 × 100 ft, asphalt
- Equipment: ADS-B, Handheld GPS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 75; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; seat: rear; restraint: 4-point; flight hours: 23,000 total, 75 in this make and model, 18,000 as pilot in command, 4 in the last 90 days, 1 in the last 30 days

## Weather

- Conditions: Visual (VMC), Dawn
- Wind: 220° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 72 °F, dew point 34 °F
- Altimeter: 30.04 inHg
- Observed at: KSEE
- METAR: KSEE 082147Z 22006KT 10SM SKC 22/01 A3004

## 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 20241208019069A](https://openairdocs.org/incident/20241208019069A), Dec 8, 2024: Boeing A75N1(PT17), El Cajon, CA, Substantial damage. Aircraft landed on 27L @ see aproximately 1400. Upon landing veered off left side of runway, then back on runway due to flat tire on l/h MLG resulting in wheel…

## Other investigations on N9199R (2)

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 FTW73DRJ16](https://openairdocs.org/ntsb/FTW73DRJ16), Sep 13, 1972: Boeing A75N1 (N9199R), Evelyn, LA, substantial damage
- [NTSB FTW73FRJ11](https://openairdocs.org/ntsb/FTW73FRJ11), Aug 10, 1972: Boeing A75N1 (N9199R), Natchitoches, LA, minor damage

## Docket (3 files)

The files NTSB released with the investigation on May 9, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=199407. 261 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 260 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18618143&FileExtension=pdf&FileName=6120%20059_Redacted-Rel.pdf
- Mor-pilot and passenger statement (item 2, PDF, 1 page, 65 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18607603&FileExtension=pdf&FileName=MOR%20059-Rel.pdf
- Accident photos (item 3, PDF, 3 pages, 841 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18607234&FileExtension=pdf&FileName=68237-Rel.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.

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