NTSB CAROL · Event
Event MIA04LA038
Registry · N4721R
FAA Aircraft Registry record.
Make / Model
CESSNA 172RG
Year of manufacture
1979 · 24 years old at event
Engine
LYCOMING O&VO-360 SER (180 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
19790914
ADS-B equipped
Yes — Mode-S A5CB13
Registrant of record
WATERDAWG EXPRESS LLC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
Pilot's improper emergency landing gear extension procedure which resulted in the right main landing gear not locking in the down position subsequent right main landing gear collapsing on landing.
Factual narrative
On December 24, 2003, about 2030 eastern standard time, a Cessna 172RG, N4721R, registered to an individual and operated by Avion Jet Center, LLC, as a Title 14 CFR Part 91 personal flight had the right main landing gear collapse during landing on runway 27 at Key West International Airport, Key West, Florida. Visual meteorological conditions prevailed at the time, and an IFR flight plan was filed. The commercial-rated pilot and passenger received no injuries, and the airplane incurred substantial damage. The flight originated from St. Lucie County International Airport, Fort Pierce, Florida, on the same day about 1815. The pilot stated that he was cleared to land on runway 27 and when he selected to extend the landing gear, he did not get a green light to confirm all three landing gear were down and locked. He continued with the landing checklist in hope the landing gear light would illuminate. There was no light upon completion of the landing checklist, he checked the electrical fuses and performed several cycles of gear extension with no change to the indication of the landing gear position. He pumped the emergency gear extension hand pump. He informed the tower of the situation. The tower instructed him to perform several low fly-bys. Tower and fire rescue personnel visually verified that all three landing gear were down. As the airplane's main landing gear touched the runway in a soft field-landing configuration, the right main landing gear collapsed. The airplane veered off the runway to the right and came to a stop at a ditch. The pilot and passenger exited the airplane without assistance. In a later statement to NTSB, the pilot stated that he pumped the emergency gear extension pump handle until he felt resistances. He could not remember how many strokes exactly he performed, somewhere from 2 to 3 strokes. The airplane was removed from the accident site and relocated to a maintenance facility on the airport. On a later date, under NTSB and FAA supervision, the airplane was placed on jacks to perform a gear extension and retraction examination. The nose gear was isolated from the hydraulic system due to the extent of damage received in the accident. The main landing gears were operationally checked once with the airplane's own battery power and twice with the emergency landing gear extension hydraulic hand pump for manual extension of the landing gear. The main landing gears extended and locked into position within 12 to 15 pumps of the emergency landing gear extension hydraulic hand pump. No defects were observed in the operation of the extension and locking of the main landing gears by hand pump. An examination of the main landing left and right gear actuators and locking systems revealed no anomalies. Avion's chief flight instructor stated close to a month before the accident, on the accident airplane, he had to perform an emergency extension of the landing gear by the hand pump; more so, it took anywhere from 10 to 20 pumps to lower the gear and into the lock position. According to the chief pilot who checked out the pilot only verbal instructions on how to extend the landing gear by hand pump was given during the check ride in the airplane. On approach the pilot selected to extend the landing gear, but he did not get a green light to confirm all three landing gear were down and locked. He checked the electrical fuses and performed several cycles of gear extension with no change to the indication of the landing gear position. He pumped the emergency gear extension hand pump. He advised air traffic control and was instructed to perform several low fly-bys. Tower and fire rescue personnel visually verified that all three landing gear were down. As the airplane's main landing gear touched the runway in a soft field-landing configuration, the right main landing gear collapsed. The pilot stated that he pumped the emergency gear extension pump handle until he felt resistances. He could not remember how many strokes exactly he performed, somewhere from 2 to 3 strokes. The main landing gears were operationally checked once with the airplane's own battery power and twice with the emergency landing gear extension hydraulic hand pump for manual extension of landing gears. The main landing gears extended and locked into position within 12 to 15 pumps of the emergency landing gear extension hydraulic hand pump. No defects were observed in the operation of the extension and locking of the main landing gears by hand pump. An examination of the main landing left and right gear actuators and locking systems revealed no anomalies. Avion's chief flight instructor stated close to a month before the accident, on the accident airplane, he had to perform an emergency extension of the landing gear by the hand pump; more so, it took anywhere from 10 to 20 pumps to lower the gear and into the lock position. According to the chief pilot who checked out the pilot only verbal instructions on how to extend the landing gear by hand pump was given during the check ride in the airplane. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_2003_MIA04LA038.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)
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- Semantic Scholar 2025 · Article (Applied Sciences)
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- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
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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 ↗