DEN06LA041 · Piper PA-30
Piper PA-30 · Accident: airframe, component or system failure on approach
From Sioux Gateway Airport / Brigadier General Bud Day Field (SUX) to Greeley–Weld County Airport (GXY)
Event
- NTSB case
- DEN06LA041
- 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
- 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
- Instrument Meteorological Cond
Piper PA-30
- Aircraft type
- Piper PA-30
- Category
- Airplane
- 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
- N7743Y
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Sioux Gateway Airport / Brigadier General Bud Day Field (SUX), Sioux City, IATo Greeley–Weld County Airport (GXY), Greeley, CO
- 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 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
- 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
- Airframe, component or system failure
- 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
- Airframe › Ice
- Pilot in command › Flight into adverse weather, performed
- Pilot in command › Wheels up landing, performed
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot was cleared for the ILS approach to runway 34 (10,000 feet by 100 feet, dry asphalt) and was instructed to change radio frequency to the airport UNICOM. The pilot performed a missed approach, contacted approach control and informed them that he was executing a missed approach for a "no gear indication." The airplane subsequently circled over the airport in an attempt to get the landing gear to come down. Finally, the pilot performed a wheels up landing. During the landing, the airplane's right wing struck a runway sign. The pilot said that about half way to their destination, they heard something vibrate. After 5 minutes the vibration stopped. The pilot said the vibration occurred again later. On the ILS approach, the pilot said the wheels failed to come down. "I advised approach control and said I intended to circle the field and extend the landing gear manually." The pilot said he "was not successful lowering the wheels. They wouldn't budge." The pilot said that airport personnel requested he continue to circle until emergency equipment was in place. "I did, and continued trying to lower the wheels. When the airport people were ready, we landed with the wheels up." The pilot said the temperature en route was "about minus 5 [degrees]." Responders to the airplane reported that it was covered with ice that measured approximately 3/4 inch thick. An examination of the airplane's systems showed no anomalies. The weather at the airport was reported as ceilings 400 broken, 5,500 broken, 7,500 overcast, 1-1/2 mile visibility, temperature 2 degrees Fahrenheit (F), dew point -2 degrees F, winds 040 at 16 knots, and altimeter 30.32 inches.
Probable cause
the pilot's flight into adverse weather conditions, the airframe ice, and the wheels up landing. Factors contributing to the accident were the icing conditions, the frozen landing gear, the frozen alternate gear extension system, and the runway sign.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN06LA041
- Event ID
- 20060223X00221
- Case number
- DEN06LA041
- 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, coordinates. 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: 83192d629989ece1e466ad5c7c4a70ad060bd6a17e9197e2670323e693b4ab6f; retrieved 2026-09-21T18:49:43.103Z.