WPR18FA178 · Schempp-Hirth STANDARD CIRRUS UNDESIGNAT
Schempp-Hirth STANDARD CIRRUS UNDESIGNAT · Accident: loss of control in flight while maneuvering
From Sampley's Airport (28AZ) to Sampley's Airport (28AZ)
Event
- NTSB case
- WPR18FA178
- 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
- 1 · all aircraft and ground
- Ground fatalities
- Unknown
- 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
Schempp-Hirth STANDARD CIRRUS UNDESIGNAT
- Aircraft type
- Schempp Hirth STANDARD CIRRUS
- Category
- Glider
- 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
- N7880
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Sampley's Airport (28AZ), Aguila, AZTo Sampley's Airport (28AZ), Aguila, AZ
- Aircraft age
- About 48 years (built 1970)
- 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 91: General Aviation
- 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
- Maneuvering
- Defining eventThe 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
- Loss of control in flight
- 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
- Aircraft › Aircraft oper/perf/capability
- Personnel issues › Task performance
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The glider pilot departed the airport via a tow winch for a local area flight. The tow winch driver reported that the takeoff and flight in the pattern were normal. When he observed the glider again, about 3 minutes later, it was crossing the approach end of the runway at an altitude of about 400 ft. The glider made a right 360° turn, abruptly pitched 60° nose-down and completed two spins. The glider came to rest inverted on the desert floor. An examination of the glider revealed no mechanical malfunctions that would have precluded normal operations. Investigators established flight control continuity, and all breaks were attributed to impact forces. Given the glider's circling at low altitude, it is likely that the pilot encountered atmospheric lift (thermal) and was attempting to climb when he inadvertently exceeded the glider's critical angle of attack and entered an aerodynamic stall/spin. The glider's low altitude at the time of the spin entry would have precluded recovery.
Probable cause
The pilot's exceedance of the glider's critical angle of attack while attempting a thermal climb at low altitude, which resulted in an aerodynamic stall/spin at an altitude that precluded recovery.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record WPR18FA178
- Event ID
- 20180623X00040
- Case number
- WPR18FA178
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
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, cause areas. 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: bba4a536119de0f5cd2cf7165326a0699a3e7a708527c0f96e07a2728b66166b; retrieved 2026-09-15T06:42:55.570Z.