Overall Trends
Total, fatal, and serious accidents in the selected range.
Premium research interface
The modern interface for aviation safety intelligence.
Search investigations, review source evidence, monitor watched reports, and trace long-term patterns from one calm, data-first workspace.
63k+
Reports indexed
1940-2026
Coverage
Recent
Last data refresh
Search everything
Fast key and full-text search with live filters, watches, and precise metadata.
Use quotes for exact phrase matches (for example "fuel selector valve").
Featured Report
Safety trends by operating rule
Track fatal and non-fatal accident patterns across Part 91, Part 135, and Part 121 operations.
Loading trend charts…
High-signal investigations
Major cases, deep-report coverage, and investigation media across decades of NTSB history.
Browse the aviation graph
Move quickly by aircraft, airport, operator, and time with indexes built for research, not wandering.
Last Data Update
By Decade
By Month
Aircraft Manufacturer
More manufacturersAirports
More airportsOperators
More operatorsAbout
Aviation safety reports, made easier to study
NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.
The goal is practical safety education: make it faster to find relevant investigations, compare similar events, review factual records, and understand the evidence behind probable-cause and preliminary reports.
The investigative work and source records belong to the National Transportation Safety Board and the published investigation record. This site is not affiliated with or endorsed by the NTSB.
FAQs
NTSB Report
June 30, 1988 · Helio HST-550A · N9991F
Perris, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 30, 1988
Injury Outcomes
1 injury (1 fatality)
Location
Perris, CA
Aircraft
Helio HST-550A
Tail Number
N9991F
Operator
Perris Valley Skydiving
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX88FA241
AFTER DROPPING SKYDIVERS THE PILOT ENTERED A DESCENT TO RETURN TO THE AIRPORT FOR ANOTHER LOAD OF JUMPERS. HE WAS RECEIVING RADAR ADVISORIES DURING THE DROP FROM A TRACON CONTROLLER. AS THE AIRCRAFT DESCENDED BELOW 4,000 FEET MSL THE CONTROLLER TERMINATED THE RADAR ADVISORY SERVICE. IMMEDIATELY AFTER THE CONTROLLER DISCONTINUED THE SERVICE HE ASKED THE PILOT TO CHECK FOR A STUCK MICROPHONE SWITCH. THE AIRCRAFT CONTINUED ITS DESCENT AND COLLIDED WITH A CAMPING TRAILER AND BUILDING UNDER CONSTRUCTION IN AN EXTREME NOSE LOW ATTITUDE. THE ELEVATOR TRIM WAS FOUND IN THE FULL NOSE DOWN POSITION. NO OTHER MALFUNCTIONS WERE FOUND.
NTSB Probable Cause
FAILURE OF THE ELECTRICAL STABILIZER TRIM CONTROL THAT RESULTED IN AN UNCOMMANDED FULL NOSE DOWN ELEVATOR TRIM COMMAND.
Full Narrative
AFTER DROPPING SKYDIVERS THE PILOT ENTERED A DESCENT TO RETURN TO THE AIRPORT FOR ANOTHER LOAD OF JUMPERS. HE WAS RECEIVING RADAR ADVISORIES DURING THE DROP FROM A TRACON CONTROLLER. AS THE AIRCRAFT DESCENDED BELOW 4,000 FEET MSL THE CONTROLLER TERMINATED THE RADAR ADVISORY SERVICE. IMMEDIATELY AFTER THE CONTROLLER DISCONTINUED THE SERVICE HE ASKED THE PILOT TO CHECK FOR A STUCK MICROPHONE SWITCH. THE AIRCRAFT CONTINUED ITS DESCENT AND COLLIDED WITH A CAMPING TRAILER AND BUILDING UNDER CONSTRUCTION IN AN EXTREME NOSE LOW ATTITUDE. THE ELEVATOR TRIM WAS FOUND IN THE FULL NOSE DOWN POSITION. NO OTHER MALFUNCTIONS WERE FOUND.
Flight
Event TypeAccident
Event Time13:00 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHelio HST-550A
Tail NumberN9991F
Aircraft CategoryAir
DamageDestroyed
OperatorPerris Valley Skydiving
Operating RulePart 91
Engines1
Engine TypeTurboprop
Engine DetailsP&W · PT-6A-27 · Turboprop · 680
Seats10
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 48 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 8 kt
Visibility3 sm
CeilingNone
Temperature / Dew Point59
Altimeter29.00 inHg
Observation Time19:55
Weather SourceWFAC