NTSB CAROL · Event
Event ERA25LA096
Registry · N555HF
FAA Aircraft Registry record.
Make / Model
PIPER PA-44-180
Year of manufacture
2003 · 22 years old at event
Engine
LYCOMING O&VO-360 SER (180 hp)
Seats / Engines
4 seats · 2 engines
Last airworthiness date
20030825
ADS-B equipped
Yes — Mode-S A712B3
Registrant of record
CHRISTIANSEN AVIATION LLC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The separation of the securing hardware for the right main landing gear upper and lower torque links for undetermined reasons, which prevented extension of the right main landing gear.
Factual narrative
Both pilots reported that after performing airwork they returned to the departure airport where multiple uneventful full stop landings were performed. They then departed and while on the base leg of the airport traffic pattern the right main landing gear did not fully extend. At that point the designated pilot examiner (DPE) took the controls from the pilot applicant, and during the course of 90 minutes, made multiple attempts to fully lower the right main landing gear that were ultimately unsuccessful. The DPE then elected to land with the landing gear retracted rather than with two landing gear down and one retracted. After touchdown the airplane came to rest near the runway centerline. The underside of the fuselage was substantially damaged during the landing. After raising the airplane from the runway, the right main landing gear was manually pulled out of the wheel well and during that process it was discovered that the hardware that secured the upper and lower torque links were not in position and could not be located. Since the hardware could not be found, no determination could be made as to the reason for the separation of the hardware. A review of the airplane’s maintenance records revealed that the hardware securing the right main landing gear torque links was replaced last on about 11 months before the accident. At the time of the accident, the airplane had accrued about 324 flight hours since the hardware replacement. The mechanic who performed the last 100-Hour inspection, about 6 months and 46 hours before the accident, reported that he did not notice any abnormality or defects with the torque link bolts at that time. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).
- — Aircraft-Aircraft systems-Landing gear system-Main landing gear-Malfunction
- — Not determined-Not determined-(general)-(general)-Unknown/Not determined
Verbatim from NTSB's published report. Source file
NTSB_2025_ERA25LA096.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (maintenance). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2026 · Journal article (IJAAA)
From Reactive to Predictive: A hybrid Trust-Mediated Adoption Framework for Data-Driven Maintenance in Distributed-Authority Aviation Environments
Modern aviation maintenance operates within increasingly data-intensive technological environments, yet the operational integration of predictive maintenance into routine decision-making remains incon…
- Semantic Scholar 2025 · Article (Applied Sciences)
Decision-Making Framework for Aviation Safety in Predictive Maintenance Strategies
The implementation of predictive maintenance (PM) in aviation presents unique challenges due to strict safety requirements, complex operational environments, and regulatory constraints.
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
Low-Resource Automatic Speech Recognition Domain Adaptation – A Case-Study in Aviation Maintenance
With timeliness and efficiency being critical in the aviation maintenance industry, the need has been growing for smart technological solutions that optimize and streamline the different underlying ta…
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
A New Trajectory in UAV Safety: Leveraging Reinforcement Learning for Distance Maintenance Under Wind Variations
In the field of aviation, safety is a critical cornerstone, and the operation of Unmanned Aerial Vehicle (UAV) systems is deeply connected with this principle.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Just Culture in Aviation: A Metaphorical Study on Aircraft Maintenance Students
Just Culture, a sub-dimension of safety culture, has been a prominent and debated topic in aviation safety in recent years.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Performance PRISM: A Comprehensive Framework For Performance Measurement In Aircraft Maintenance
Aircraft maintenance is governed by rigorous safety requirements and high operational complexity, demanding robust performance measurement frameworks to ensure optimal maintenance practices.
Browse the full corpus — academia portal ↗