# NTSB investigations: Airframe/component/system failure/malfunction

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

Page 45 of 79 · 3,929 cases

## Cases, newest first

- [NTSB LAX91LA217](https://openairdocs.org/ntsb/LAX91LA217.md): Farrington 18A · Long Beach, CA · Accident · No injuries · Limited investigation · Final report · May 17, 1991 · N6126S · Substantial damage
  > Ground resonance remedial action not performed by the pilot.
- [NTSB SEA91LA106](https://openairdocs.org/ntsb/SEA91LA106.md): Beech A36 · Rawlins, WY · Accident · No injuries · Limited investigation · Final report · May 16, 1991 · N6724T · Substantial damage
  > The pilot's lack of familiarity with the aircraft, his lack of understanding of the electrical system, and a premature precautionary landing. Contributing to the accident were an alternator failure and the resultant false readings of the powerplant…
- [NTSB LAX91LA214](https://openairdocs.org/ntsb/LAX91LA214.md): Grumman G164B · Yuba City, CA · Accident · Minor injuries · Limited investigation · Final report · May 14, 1991 · N48658 · Substantial damage
  > Fatigue in the propeller blade which led to its ultimate failure. Factors relating to this accident were the soft terrain conditions on which the airplane landed and a berm across the airplane's ground path.
- [NTSB MIA91LA144](https://openairdocs.org/ntsb/MIA91LA144.md): Air Tractor AT-301 · Tutwiler, MS · Accident · Minor injuries · Limited investigation · Final report · May 13, 1991 · N8563S · Substantial damage
  > Fatigue failure of one of the propeller blades resulting in the forced landing. Contributing to the accident was lack of suitable terrain.
- [NTSB NYC91LA134](https://openairdocs.org/ntsb/NYC91LA134.md): Tierra II · Cooperstown, NY · Accident · Minor injuries · Limited investigation · Final report · May 12, 1991 · N198WC · Destroyed
  > The mechanical failure of the flight control system, which resulted in a a loss or airplane control and subsequent forced landing in trees.
- [NTSB CHI91FA152](https://openairdocs.org/ntsb/CHI91FA152.md): Short Brothers SD3-60 · Chicago, IL · Accident · No injuries · Field investigation · Final report · May 11, 1991 · N715NC · Substantial damage
  > The failure of the nose wheel steering hydraulic line during after landing ground operations. A related factor is the manufacturer's inadequate inspection and/or replacement standards.
- [NTSB FTW91LA077](https://openairdocs.org/ntsb/FTW91LA077.md): Vuncannon Rotoway Exec 152 · Jonesboro, AR · Accident · Serious injuries · Limited investigation · Final report · May 10, 1991 · N316FV · Destroyed
  > The pilot's inadequate lookout and failure to maintain sufficient clearance from the wires for safe operation.
- [NTSB SEA91FA099](https://openairdocs.org/ntsb/SEA91FA099.md): Piper PA-34-200T · Ravensdale, WA · Accident · 1 fatal · Field investigation · Final report · May 7, 1991 · N2859M · Destroyed
  > The in-flight breakup of the airplane as a result of the pilot exceeding the speed and stress limits for the airplane. A factor relating to the accident was the center of gravity loading that exceeded the aft limits.
- [NTSB DEN91FA068](https://openairdocs.org/ntsb/DEN91FA068.md): Bell 206B-3 · Houston, TX · Accident · Serious injuries · Field investigation · Final report · May 7, 1991 · N717NH · Destroyed
  > Engine mount delamination and lack lubrication, causing the drive shaft to fail. Poor servicing of the helicopter was a related factor.
- [NTSB LAX91LA191](https://openairdocs.org/ntsb/LAX91LA191.md): Hiller UH-12E · Delano, CA · Accident · No injuries · Limited investigation · Final report · May 4, 1991 · N4414 · Substantial damage
  > That the pilot improperly performed the autorotation by misjudging the flare altitude. Contributing to this accident was the total failure of the freewheeling sprag clutch due to excessive wear and the soft dirt terrain.
- [NTSB NYC91FA125](https://openairdocs.org/ntsb/NYC91FA125.md): Boeing 727-100QC · Windsor Locks, CT · Accident · No injuries · Field investigation · Final report · May 3, 1991 · N425EX · Destroyed
  > A catastrophic and uncontained failure of the no.3 engine which resulted in a fuel fed fire.
- [NTSB DEN91FA065](https://openairdocs.org/ntsb/DEN91FA065.md): Piper PA-31B-310 · Bennett, CO · Accident · 1 fatal · Field investigation · Final report · May 1, 1991 · N7407L · Destroyed
  > In-flight separation of the left engine cowl assembly that was not properly latched, and failure of the pilot to maintain minimum control speed, which resulted in his loss of aircraft control. Factors related to the accident were: an inadequate preflight…
- [NTSB FTW91LA064](https://openairdocs.org/ntsb/FTW91LA064.md): Bell 47G4 · Corpus Christi, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 27, 1991 · N1195W · Destroyed
  > The initial restricted movement and eventual locking of the cyclic control as a result of the failure of the lateral servo. A factor was the installation of the failed component by an unqualified person.
- [NTSB CHI91FA140](https://openairdocs.org/ntsb/CHI91FA140.md): Cessna P210 · Kansas City, MO · Accident · 1 fatal · Field investigation · Final report · Apr 25, 1991 · N65M · Destroyed
  > The pilot in command's intentional flight with known mechanical deficiencies in the aircraft which resulted in a fire & forced landing in unsuitable terrain. A factor contributing to the accident was improper maintenance to the turbocharger waste gate by…
- [NTSB FTW91FA070](https://openairdocs.org/ntsb/FTW91FA070.md): Bell 206B · So. Marsh 275 · Accident · 2 fatal · Field investigation · Final report · Apr 23, 1991 · N213AL · Destroyed
  > The inflight structural failure and separation of the vertical fin which led to a loss of control and mast bumping. The failure of the fin was due to inadequate corrosion control efforts by the operator.
- [NTSB NYC91LA102](https://openairdocs.org/ntsb/NYC91LA102.md): Schweizer SGS-1-30 · Wurtsboro, NY · Accident · 1 fatal · Limited investigation · Final report · Apr 6, 1991 · N3620D · Destroyed
  > An inflight failure of the left wing spar due to overload from pilot induced control inputs, while recovering from a dive. Factors related to the accident were, the pilot's decision to fly with the trim system disconnected and lack of recent experience in…
- [NTSB LAX91LA160](https://openairdocs.org/ntsb/LAX91LA160.md): Burnett, Jerry D. Challenger II · Bullhead City, AZ · Accident · No injuries · Limited investigation · Final report · Apr 6, 1991 · N4555J · Substantial damage
  > The disintegration of the propeller. Contributing to this accident was the deterioration of aircraft control and the nonavilability of suitable landing terrain.
- [NTSB DCA91MA033](https://openairdocs.org/ntsb/DCA91MA033.md): Embraer EMB-120RT · Brunswick, GA · Accident · 23 fatal · Class 1 · Major · Final report · Apr 5, 1991 · N270AS · Destroyed
  > The loss of control in flight as a result of a malfunction of the left engine propeller control unit which allowed the propeller blade angles to go below the flight idle position. Contributing to the accident was the deficient design of the propeller control…
- [NTSB BFO91LA042](https://openairdocs.org/ntsb/BFO91LA042.md): Beech P35 · Gilbertsville, KY · Accident · No injuries · Limited investigation · Final report · Apr 3, 1991 · N1476G · Substantial damage
  > The pilot's failue to ensure the gear was fully extended during a precautionary landing after the loss of electrical power for undetermined reasons.
- [NTSB ATL91LA076](https://openairdocs.org/ntsb/ATL91LA076.md): David Lowe ULTRA-PUP · Waycross, GA · Accident · No injuries · Limited investigation · Final report · Apr 3, 1991 · N71427 · Substantial damage
  > The failure of the airplane battery, which prohibited the complete extension of the landing gear, resulting in a landing with the nose gear retracted. A factor in the accident was the soft terrain at the selected landing area.
- [NTSB LAX91LA172](https://openairdocs.org/ntsb/LAX91LA172.md): Hughes 369C · Papua, Papua New Guinea · Accident · Minor injuries · Limited investigation · Final report · Apr 2, 1991 · N9227F · Destroyed
  > The loss of control of the helicopter due to a restriction of the cyclic control system.
- [NTSB CHI91IA120](https://openairdocs.org/ntsb/CHI91IA120.md): Cessna 172RG · West Chicago, IL · Incident · No injuries · Incident investigation · Final report · Apr 2, 1991 · N9592B · Minor damage
  > Failure of the splined shaft on the right main landing gear pivot assembly. A factor related to the incident was inadequate design of the landing gear pivot assembly.
- [NTSB SEA91LA077](https://openairdocs.org/ntsb/SEA91LA077.md): Bell BH-47G2A · Waitsburg, WA · Accident · No injuries · Limited investigation · Final report · Mar 31, 1991 · N38926 · Substantial damage
  > The improper installation of the main rotor mast nut and lock washer by maintenance personnel which resulted in the separation of the main rotor system.
- [NTSB ANC91LA043](https://openairdocs.org/ntsb/ANC91LA043.md): Piper PA-31T · Kenai, AK · Accident · No injuries · Limited investigation · Final report · Mar 31, 1991 · N308SC · Substantial damage
  > The failed nose gear shimmy dampner, contributing to the accident was the rough ice and snow covered ramps where the airplane had been operating and the lack of maintenance on the runways.
- [NTSB LAX91LA135](https://openairdocs.org/ntsb/LAX91LA135.md): Mooney M20D · Herlong, CA · Accident · No injuries · Limited investigation · Final report · Mar 18, 1991 · N1921Y · Substantial damage
  > The inadequate preparation of the propeller during overhaul. The installation of an improper pitched propeller and the fatigue failure of the propeller blade emanating from corrosion were factors in the accident.
- [NTSB ATL91FA067](https://openairdocs.org/ntsb/ATL91FA067.md): Piper PA-28-201T · Hamilton, NC · Accident · 2 fatal · Field investigation · Final report · Mar 18, 1991 · N2871H · Destroyed
  > The pilot's improper use of equipment which affected the operation of the standby vacuum pump, the pilot's loss of aircraft control after experiencing spatial disorientation, and his exceeding the design stress limits of the aircraft. Factors related to the…
- [NTSB LAX91FA134](https://openairdocs.org/ntsb/LAX91FA134.md): Cessna 172RG · Buckeye, AZ · Accident · 2 fatal · Field investigation · Final report · Mar 16, 1991 · N6439 · Destroyed
  > The pilot of the airplane exceeding the certificated never exceed velocity. The overloading of the wing attachment fittings while maneuvering was a factor in the accident.
- [NTSB ATL91LA066](https://openairdocs.org/ntsb/ATL91LA066.md): Benson B8M · Hartselle, AL · Accident · 1 fatal · Limited investigation · Final report · Mar 16, 1991 · N6572K · Substantial damage
  > The improper installation of the main rotor bearing block by the owner/pilot which resulted in the separation of the main rotor system.
- [NTSB MIA91LA113](https://openairdocs.org/ntsb/MIA91LA113.md): Bell UH-1B · Vero Beach, FL · Accident · Minor injuries · Limited investigation · Final report · Mar 12, 1991 · N9687R · Substantial damage
  > Improper maintenance adjustment by company maintenance personnel resulting in overtorque of a tailboom attach bolt which allowed the tailboom to shift. This disengaged the tail rotor drive shaft at a coupling resulting in the loss of tail rotor drive.
- [NTSB MIA91FA095](https://openairdocs.org/ntsb/MIA91FA095.md): Beech 35-C33A · Key West, FL · Accident · 3 fatal · Field investigation · Final report · Mar 10, 1991 · N4828J · Destroyed
  > The pilot-in-command's failure to maintain airspeed, while returning for an emergency landing following propeller failure, resulting in the aircraft stalling and entering a spin.
- [NTSB ANC91LA033](https://openairdocs.org/ntsb/ANC91LA033.md): Cessna A185-F · Shageluk, AK · Accident · No injuries · Limited investigation · Final report · Mar 8, 1991 · N1855Q · Substantial damage
  > The collapse of the left main landing gear during the landing roll due to preexisting cracks.
- [NTSB DCA91MA023](https://openairdocs.org/ntsb/DCA91MA023.md): Boeing 737-291 · Colorado Spgs, CO · Accident · 25 fatal · Class 1 · Major · Final report · Mar 3, 1991 · N999UA · Destroyed
  > A loss of control of the airplane resulting from the movement of the rudder surface to its blowdown limit. The rudder surface most likely deflected in a direction opposite to that commanded by the pilots as a result of a jam of the main rudder power control…
- [NTSB ATL91LA062](https://openairdocs.org/ntsb/ATL91LA062.md): Piper PA-23-250 · Suches, GA · Accident · Serious injuries · Limited investigation · Final report · Mar 1, 1991 · N6546Y · Destroyed
  > The pilot's failure to maintain altitude during cruise flight after loss of electrical power for an undetermined reason.
- [NTSB DEN91IA047](https://openairdocs.org/ntsb/DEN91IA047.md): Cessna 421C · Fort Morgan, CO · Incident · No injuries · Incident investigation · Final report · Feb 25, 1991 · N125KS · Minor damage
  > The total failure of the flight compartment windshield (copilot's side) for undetermined reasons.
- [NTSB MIA91LA084](https://openairdocs.org/ntsb/MIA91LA084.md): Fairchild Hiller FH-1100 · Ldl-By-The-Sea, FL · Accident · Minor injuries · Limited investigation · Final report · Feb 22, 1991 · N210FH · Substantial damage
  > Tail rotor blade failure due to undetermined reasons and unsuitable terrain during a precautionary landing.
- [NTSB CHI91LA097](https://openairdocs.org/ntsb/CHI91LA097.md): Hughes 269C · North Mankato, MN · Accident · Serious injuries · Limited investigation · Final report · Feb 20, 1991 · N8955F · Destroyed
  > The fatique failure of the tail boom support strut attachment cluster and the improper inspection of the cluster attachment.
- [NTSB LAX91FA103](https://openairdocs.org/ntsb/LAX91FA103.md): Cessna 172 · Bullhead City, CA · Accident · Serious injuries · Field investigation · Final report · Feb 17, 1991 · N8551B · Substantial damage
  > The pilot's poor in-flight planning and decision and physical impairment from fatigue; he also failed to maintain flying speed. The lineman's failure to secure the access door and the pilot's impairment due to consumption of alcohol were factors in the…
- [NTSB LAX91LA123](https://openairdocs.org/ntsb/LAX91LA123.md): Beech B95 · Riverside, CA · Accident · No injuries · Limited investigation · Final report · Feb 10, 1991 · N2712Y · Substantial damage
  > Failure of the pilot to follow the emergency gear extension procedure to fully extend the landing gear. Contributing to the accident was the failure of the pilot to monitor the condition of the electrical power system, leading to the complete loss of…
- [NTSB LAX91LA092](https://openairdocs.org/ntsb/LAX91LA092.md): Cessna 150M · Buckeye, AZ · Accident · No injuries · Limited investigation · Final report · Feb 6, 1991 · N9433U · Substantial damage
  > That maintenance personnel failed to properly install the wings by not reconnecting the bolts at the bellcrank and performed an inadequate annual inspection.
- [NTSB LAX91LA090](https://openairdocs.org/ntsb/LAX91LA090.md): Riddell Lancair 235 · Agua Caliente, CA · Accident · Serious injuries · Limited investigation · Final report · Feb 1, 1991 · N17S · Substantial damage
  > The failure of the propeller blades due to a weakening of the wood structure due to acid hydrolysis. A factor in the accident was the inadequate maintenance of the propeller assembly by allowing exposure to excessive moisture and heat.
- [NTSB CHI91LA086](https://openairdocs.org/ntsb/CHI91LA086.md): Beech 200 · Indianapolis, IN · Accident · No injuries · Limited investigation · Final report · Feb 1, 1991 · N5584M · Substantial damage
  > Separation of the aft, upper, accessory case cowl assembly from the airplane, and inadequate airframe equipment provided by the manufacturer.
- [NTSB NYC91DFA02](https://openairdocs.org/ntsb/NYC91DFA02.md): Hayes Kolb/Twinstar · Round Lake, NY · Accident · 1 fatal · Final report · Jan 27, 1991 · N71817 · Substantial damage
  > In-flight structural failure of the outboard wing attachment fittings on both wings due to an undetermined reason.
- [NTSB FTW91FA033](https://openairdocs.org/ntsb/FTW91FA033.md): Piper PA-30 · Oppella, AR · Accident · 1 fatal · Field investigation · Final report · Jan 27, 1991 · N291R · Destroyed
  > The pilot's failure to maintain a proper climb rate following loss of his visual references and allowing himself to become diverted during the takeoff. Factors in the accident were interrupted instrument lighting and the dark night conditions.
- [NTSB LAX91LA099](https://openairdocs.org/ntsb/LAX91LA099.md): Walter Chandler Phoenix · Cayucos, CA · Accident · Minor injuries · Limited investigation · Final report · Jan 25, 1991 · N2027C · Substantial damage
  > The pilot's selection of unsuitable terrain and his misjudgment of the proper touch down point following the pilot's decision to make a precautionary landing. Contributing to the accident was an in-flight separation of the trim tab rod from the trim tab,…
- [NTSB LAX91LA079](https://openairdocs.org/ntsb/LAX91LA079.md): Robinson R-22 HP · Scottsdale, AZ · Accident · No injuries · Limited investigation · Final report · Jan 25, 1991 · N21439 · Substantial damage
  > The failure of the drive belts due to excessive wear of the clutch assembly upper sheave and the pilot's inaccurate flare during the termination of the autorotation. A factor in the accident was the inadequate design of the clutch assembly upper sheave.
- [NTSB NYC91LA062](https://openairdocs.org/ntsb/NYC91LA062.md): Cessna P206 · Cleveland, OH · Accident · Minor injuries · Limited investigation · Final report · Jan 23, 1991 · N4626F · Substantial damage
  > Fatigue failure of the number two propeller blade actuating pin, due to improper installation of the pins and non-compliance with an airworthiness directive (AD 77-13-77).
- [NTSB SEA91FA261](https://openairdocs.org/ntsb/SEA91FA261.md): Beech 35 · Walla Walla, WA · Accident · No injuries · Field investigation · Final report · Jan 16, 1991 · N3081V · Substantial damage
  > Improper static balance of the ruddervators following rebuilding/repainting, which resulted in empennage flutter. Improper installation of the trim tabs and an encounter with turbulence were related factors.
- [NTSB MIA91LA064](https://openairdocs.org/ntsb/MIA91LA064.md): Cessna 175 · Okeechobee, FL · Accident · No injuries · Limited investigation · Final report · Jan 11, 1991 · N7293M · Substantial damage
  > Failure of the right brake line at the caliper during the landing roll rendering the brakes ineffective. A factor was the pilot's misjudgement of wind direction.
- [NTSB FTW91FA029](https://openairdocs.org/ntsb/FTW91FA029.md): Beech F-90 · Nacogdoches, TX · Accident · Serious injuries · Field investigation · Final report · Jan 11, 1991 · N311DS · Destroyed
  > The loss of thrust due to the propeller's feathering on liftoff as a result of improper adjustments made during an engine change. A factor was the lack of suitable terrain to which the pilot could execute a forced landing.
- [NTSB ATL91FA020](https://openairdocs.org/ntsb/ATL91FA020.md): Mooney M20F · Pageland, SC · Accident · 2 fatal · Field investigation · Final report · Jan 11, 1991 · N6858V · Destroyed
  > Failure of the pilot to maintain control of the aircraft, due to spatial disorientation. Factors related to the accident were: the weather conditions and the malfunction of a gyro instrument (probably the attitude indicator).

Next page: https://openairdocs.org/ntsb.md?occurrence=130&page=46

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."mKey" IN (SELECT o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o."occurrenceNumber" = 1 AND o."occurrenceCode" = 130)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=130&page=45

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