Frontier Airlines Flight 567
Boeing 737-3M8 · Incident: airframe, component or system failure on approach
From General Mitchell International Airport (MKE) to Denver International Airport (DEN)
Event
- NTSB case
- DEN04IA026
- 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
- Incident
- 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
- Airline
- 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
Boeing 737-3M8
- Aircraft type
- Boeing 737
- 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
- N303FL
- Operator
- Frontier Airlines
- Onboard fatalities
- Unknown
- Route
- From General Mitchell International Airport (MKE), Milwaukee, WITo Denver International Airport (DEN), Denver, 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 121: Air Carrier
- 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
- None
Cause areas
- Reason for occurrence undetermined
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
While on final approach approximately 1/4 mile from the end of the runway, the captain applied right aileron to correct for a crosswind. He said the control yoke felt like it had "bound up." He used "excessive pressure" to get the control yoke to respond. An uneventful landing was made. During taxi, the captain cycled the control yoke left and right. After a few cycles, it seemed to move freely. He made an intentional sharp left turn and the tiller wheel seemed to "bind up." Mechanics performed a nose landing gear wheel steering test, and checked the cable tension to the nose wheel steering. A leak was discovered in the right hand nose steering accumulator, but the leak was "within limits." The case drain plugs and filters and the left and right hand aileron cables from the main wheel well outboard were inspected. Following flight control movement card 7-9002, mechanics performed an aileron PCU internal leak check. No discrepancies were noted. The airplane was then test flown and was returned to service. No data was recovered from the DFDR that would explain the event as described by the captain.
Probable cause
The restricted movement of the flight control yoke and tiller wheel steering for reasons undetermined.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN04IA026
- Event ID
- 20031203X01984
- Case number
- DEN04IA026
- 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, damage. 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: 11e304e089a89145fab3c826166902723134f0671441219ca910c4ca6cd44a49; retrieved 2026-09-18T15:34:47.954Z.