MIA85IA203
1985-06-24 · SAN JUAN, Puerto Rico · None · 1 aircraft · Status: Completed
Airport SJU
Current FAA registration · N7DD
- Make / Model
- MITSUBISHI MU-2B
- Year of manufacture
- 1974 · 11 years old at event
- Engine
- AIRESEARCH TPE331-5&6SER (776 hp)
- Seats / Engines
- 9 seats · 2 engines
- Last airworthiness date
- 19790501
- ADS-B equipped
- Yes — Mode-S A9502B
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Factual narrative
AFTER DEPARTURE THE NOSE GEAR UNSAFE LIGHT REMAINED ILLUMINATED PETER GEAR RETRACTION. ATTEMPTS TO GET A SAFE LIGHT ON THE NOSE GEAR IN THE EXTENDED POSITION WAS UNSUCCESSFUL AND WHEN THE AIRCRAFT LANDED IT SETTLED ONTO A PARTIALLY RETRACTED NOSE GEAR. INSPECTION OF THE AIRCRAFT REVEALED THAT THE NOSE GEAR STRUT HAD NOT FULLY EXTENDED AND THAT WHEN THE GEAR WAS RETRACTED THE NOSE GEAR TIRES CAUGHT THE NOSE GEAR DOORS PREVENTING THEM FROM OPENING. THE GEAR RETRACTED AGAINST THE GEAR DOORS CAUSING FAILURE OFTHE RETRACT JACKSCREW. A MICROSWITCH WHICH CUTS THE GEAR MOTOR OFF WHEN THIS CONDITION OCCURRS WAS FOUND OUT OF ADJUSTMENT AND DID NOT OPERATE. ADDITIONALLY IT WAS FOUND THAT THE MECHANICS WHO DID THE LAST GEAR RETRACT TEST ON THE AIRCRAFT USED A MAINTENANCE MANUAL FOR AN EARLIER MODEL AIRCRAFT WHICH DID NOT HAVE THIS SAFETY SWITCH THUS FAILING TO CHECK IT FOR ADJUSTMENT. NO REASON AS TO WHY THE NOSE GEAR STRUT DID NOT FULLY EXTEND WAS FOUND. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1985_MIA85IA203.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (maintenance). All research papers
- 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 2026 · Article (Reliability Engineering & System Safety) Understanding human error in military aviation maintenance: The role of Performance shaping factors, cognitive workload and error orientation
- 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.
- Semantic Scholar 2024 · Article (Defence Science Journal) Modelling of Human Factors in Aviation Maintenance Using HFACS ME Human Factors Analysis and Classification System Maintenance Extension and Bayesian Network
Aircraft maintenance is a complex task involving a skilled human workforce, spare parts, and various other resources. Human factors are an inherent element of the human workforce.
- 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 (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…