FTW98LA033 · Aerospatiale SA316B
Aerospatiale SA316B · Accident: uncontrolled altitude deviation on approach
From NM (no airport) to an unrecorded destination
Event
- NTSB case
- FTW98LA033
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Aerospatiale SA316B
- Aircraft type
- Aerospatiale SA316
- Category
- Helicopter
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- CFPWH
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From NM (no airport)To not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 133: Rotorcraft Ext. Load
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Uncontrolled altitude deviation
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Pilot in command › Settling with power, inadvertent
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The pilot was being trained in the use of GPS (Global Positioning System) navigation for deploying and retrieving seismic equipment. A long line was being used to sling the equipment to drilling sites. The pilot descended into a canyon towards the next drop site. He lowered collective slightly and established a 200 fpm (feet per minute) descent rate. He 'immediately got an uncomfortable feeling about the situation.' He decided to abort the approach and try a longer, more shallow approach into the canyon. He pushed forward slightly on the cyclic and increased collective to initiate a climb. The helicopter shuddered and the rate of descent increased. The pilot realized the helicopter had encountered its on downwash and was 'settling with power.' He lowered collective and pushed forward on the cyclic. The helicopter struck the ground, bounced slightly to the left, and spun around. The wind was light and variable.
Probable cause
the pilot inadvertently allowing the helicopter to settle with power.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record FTW98LA033
- Event ID
- 20001208X09024
- Case number
- FTW98LA033
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: e6aabe5676b5a539d3962562f55dbb44e01fba41e1cbcdf3318ad2e6f5f9cb60; retrieved 2026-09-21T21:05:57.339Z.