NTSB CAROL · Event
Event DCA95MA007
Registry · N521PA
FAA Aircraft Registry record.
Make / Model
HUGHES HELICOPTERS INC 369FF
Year of manufacture
1985 · 9 years old at event
TCDS
H3WE · MD HELICOPTERS INC (MDHI)
Engine
ROLLS-ROYC 250-C30 (650 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
20130528
ADS-B equipped
Yes — Mode-S A68DEB
Registrant of record
PATRIOT AVIATION INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
1) IMPROPERLY INSTALLED ELECTRICAL WIRING FOR SPECIAL MISSION OPERATIONS THAT LED TO AN IN-FLIGHT FIRE THAT CAUSED AIRPLANE SYSTEMS AND STRUCTURAL DAMAGE AND SUBSEQUENT AIRPLANE CONTROL DIFFICULTIES; 2) IMPROPER MAINTENANCE AND INSPECTION PROCEDURES FOLLOWED BY THE OPERATOR; AND 3) INADEQUATE OVERSIGHT AND APPROVAL OF THE MAINTENANCE AND INSPECTION PRACTICE BY THE OPERATOR IN THE INSTALLATION OF THE SPECIAL MISSION SYSTEMS.
Factual narrative
The flight was inbound to FAT following an operational exercise with two ANG F-16s. Northeast of the airport, about 9,000 feet MSL, VFR, the flight called approach control, declared an emergency due to engine fire and requested immediate vectors to the airport. Approach control asked the flight which runway they requested and the flight replied 29. The flight was seen on radar at 6, and then 4 nautical miles at 4,000 feet MSL, with the airport at 12 O'clock. The flight reported field in sight and was handed over to the tower. Intracockpit conversations were transmitted on tower frequency until impact. A pilot mentioned possibly having to make a 270 degree turn, but the flight was seen passing through the extended centerline of runway 29, about 1 1/2 miles from the approach end of the runway, appearing to be low and fast. The airplane impacted to the west on Olive Avenue. Witnesses reported that the airplane impacted in a nose low and left wing down attitude. The airplane immediately became a fireball which slid down the avenue. Several apartments on the north side of the avenue became ignited. Some major airplane components, including the right wing, right engine, and empennage came to rest on the avenue. The left engine came to rest in an apartment unit. Both pilots were fatally injured. There were injuries to persons on the ground. ADDITIONAL PERSONS: Douglas E. Mooradian Airports Operations Manager Department of Airports 2401 N. Ashley Way Fresno, CA 93727 Lieutenant Jerry Davis Police Department City of Fresno 2326 Fresno Street Fresno, CA 93721 Franklin D. Schick Manager, Airworthiness R&D Learjet, Inc. One Learjet Way Wichita, KS 67277 Charles R. Mote, Jr. Air Safety Investigator National Air Traffic Controllers Association 13036 Treecrest St. Poway, CA 92064 Fred W. Kirby Manager, Technical Services National Business Aircraft Association, Inc. 1200 Eighteenth St., N.W. Washington, D.C. 20036 Patrick W. Murphy Phoenix Air Group, Inc. Director of Maintenance 100 Phoenix Air Drive, S.W. Cartersville, Georgia 30120 AT ABOUT 1146 PST, LEARJET 35A, N521PA, OPERATING AS A PUBLIC USE AIRCRAFT, CRASHED IN FRESNO, CA. OPERATING WITH CALL SIGN DART 21, THE FLIGHTCREW HAD DECLARED AN EMERGENCY INBOUND TO FRESNO AIR TERMINAL DUE TO ENGINE FIRE INDICATIONS. THEY FLEW THE AIRPLANE TOWARD A RIGHT BASE FOR THEIR REQUESTED RUNWAY, BUT THE AIRPLANE CONTINUED PAST THE AIRPORT. THE FLIGHTCREW WAS HEARD ON TOWER FREQUENCY ATTEMPTING TO DIAGNOSE THE EMERGENCY CONDITIONS AND CONTROL THE AIRPLANE UNTIL IT CRASHED, WITH LANDING GEAR DOWN, ON AN AVENUE IN FRESNO. BOTH PILOTS WERE FATALLY INJURED. TWENTY-ONE PERSONS ON THE GROUND WERE INJURED, AND 12 APARTMENT UNITS IN 2 BUILDINGS WERE DESTROYED OR SUBSTANTIALLY DAMAGED BY IMPACT OR FIRE. INVESTIGATION REVEALED THAT SPECIAL MISSION WIRING WAS NOT INSTALLED PROPERLY, LEADING TO A LACK OF OVERLOAD CURRENT PROTECTION. THE IN-FLIGHT FIRE MOST LIKELY ORIGINATED WITH A SHORT OF THE SPECIAL MISSION POWER SUPPLY WIRES IN AN AREA UNPROTECTED BY CURRENT LIMITERS. THE FIRE RESULTED IN FALSE ENGINE FIRE WARNING INDICATIONS TO THE PILOTS THAT LED THEM TO A SHUTDOWN OF THE LEFT ENGINE. AN INTENSE FIRE BURNED THROUGH THE AFT ENGINE SUPPORT BEAM, DAMAGING THE AIRPLANE STRUCTURE AND SYSTEMS IN THE AFT FUSELAGE AND MAY HAVE PRECLUDED A SUCCESSFUL EMERGENCY LANDING. (FOR FURTHER INFORMATION, SEE NTSB/AAR-95/04) Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1994_DCA95MA007.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 (stall, 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 2023 · Conference paper
The Value of Strong Partnerships to Build a Successful Aviation Maintenance Career Pathway Program for Transitioning Military Service Members
The aerospace industry is competing with other industries for a qualified workforce, and many of those competing industries are investing heavily in creating workforce development pipelines.
- 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…
- NASA NTRS 2026 · Conference Paper
Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall
This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range …
- 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.
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