# NTSB SEA98LA059: Beech 35-C33, N1310A, Hillsboro, OR, April 1, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 1, 1998, 11:10 local (19:10 UTC) - Place: Hillsboro, OR - Coordinates: 45.43922, -122.960762 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.4392&lon=-122.9608&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report February 11, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 42772 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA98LA059 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42772/pdf - Page: https://openairdocs.org/ntsb/SEA98LA059 ## Probable cause The flight instructor's inadequate supervision and the dual student's premature lift off which resulted in inadequate airspeed, a stall, and collision with the ground. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - in flight, takeoff - initial climb - lift-off - premature, dual student (cause) - airspeed - inadequate, dual student - stall - remedial action - inadequate, pilot in command(cfi) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - runway ## Analysis While practicing soft-field takeoffs in a single-control throw-over yoke aircraft, the student pulled the aircraft off the runway prior to attaining enough speed to remain airborne. Immediately after becoming airborne, the aircraft banked sharply to the left, dropped onto the runway, and bounced back into the air. According to the instructor pilot, when he saw that the aircraft was going to lift off prematurely, he commanded the student to lower the nose. But, the student did not lower the nose enough, and the instructor did not apply forward pressure to the central control pedestal to keep the aircraft from lifting off too early. It was later discovered that the left wing had impacted the asphalt surface when the aircraft dropped back onto the runway. ## Factual narrative On April 1, 1998, approximately 1110 Pacific standard time, the left wing of a Beech 35-C33, N1310A, impacted the runway immediately after a premature liftoff at Portland-Hillsboro Airport, Hillsboro, Oregon. The certified flight instructor and his student, who holds a private pilot certificate, were not injured, but the aircraft, which was owned and operated by Tektronix Flying Club, sustained substantial damage. The 14 CFR Part 91 local instructional flight was being operated in visual meteorological conditions. No flight plan had been filed, and there was no report of an ELT transmission. According to the FAA inspector who talked to the instructor, while practicing soft-field takeoffs, the student pulled the aircraft into the air prior to attaining enough speed to remain airborne. The aircraft almost immediately banked sharply to the left, and dropped back onto the runway hard enough to be "jolted" back into the air. The takeoff was then continued, followed by an immediate return to inspect for damage. According to the instructor pilot, when the aircraft, which was configured with a single throw-over control yoke, began lifting off, he commanded the student to "drop the/your nose." The student did not drop the nose enough to avoid the premature lift-off, and the instructor did not attempt to apply forward pressure on the central control pedestal to keep the aircraft from lifting off too early. ## Aircraft - Registration: [N1310A](https://openairdocs.org/aircraft/N1310A), registered now, S/N CD-1105, built 1967 (OpenAirDocs) - Reported make and model: Beech 35-C33 - Registry model: [Beech 35-C33](https://openairdocs.org/model/beech-35-c33) (registry code 1151408) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: CD-1105 - Airframe hours: 6902 - Engines: Continental IO-470K 225 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Tektronix Flying Club - Airworthiness certificate: Standard, Utility; Standard, Normal - Last inspection: Annual, January 31, 1998, 47 hours before - Departed: HIO - Airport: HIO, Portland-Hillsboro, runway 30, 6,600 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 1,050 total, 320 in this make and model, 886 as pilot in command, 21 in the last 90 days, 13 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °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 19980401005279A](https://openairdocs.org/incident/19980401005279A), Apr 1, 1998: Beech 35C33, Portland, OR, Substantial damage. Student made premature liftoff. Settled. Wing dipped CFI continued with dual. On landing found wing damaged. (.4)while practicing soft-field takeoffs in a… ## Other investigations on N1310A (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 CEN25LA368](https://openairdocs.org/ntsb/CEN25LA368), Sep 6, 2025: Beech 35-C33 (N1310A), Brookings, SD, destroyed, investigation ongoing - [NTSB SEA99LA053](https://openairdocs.org/ntsb/SEA99LA053), Apr 18, 1999: Beech 35-C33 (N1310A), Hillsboro, OR, substantial damage. Probable cause: A landing gear collapse for undetermined reasons. 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.