# NTSB investigations: CFM International CFM56 series: 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.

## Latest cases

- [NTSB DEN08IA033](https://openairdocs.org/ntsb/DEN08IA033.md): Boeing 737-832 · Phoenix, AZ · Incident · No injuries · Incident investigation · Final report · Nov 25, 2007 · N3744F · Minor damage
  > Delamination of the right outboard tire tread during the takeoff roll due to underinflation and/or overloading during use in service.
- [NTSB CHI08IA022](https://openairdocs.org/ntsb/CHI08IA022.md): Airbus Industrie A320-211 · Fargo, ND · Incident · No injuries · Incident investigation · Final report · Oct 21, 2007 · N331NW · Minor damage
  > The failure of the Brake and Steering Control Unit, which allowed the nose landing gear to turn to the 90-degree position.
- [NTSB LAX07IA014](https://openairdocs.org/ntsb/LAX07IA014.md): Boeing 737-790 · Los Angeles, CA · Incident · No injuries · Incident investigation · Final report · Oct 19, 2006 · N614AS · No damage
  > A complete failure and depressurization of both hydraulic systems due to two separate events: 1) the failure of a engine driven pump on the 'A' system, and 2) the fatigue fracture and failure of a hydraulic line on the 'B' system.
- [NTSB NYC06FA184](https://openairdocs.org/ntsb/NYC06FA184.md): Boeing 737-300 · Pittsburgh, PA · Accident · Minor injuries · Field investigation · Final report · Jul 27, 2006 · N529AU · Substantial damage
  > The airplane tug driver's inadvertent movement of the tug gear shift lever from forward to reverse, which resulted in the nose landing gear collapse. Contributing to the accident was the defective gear shift lever.
- [NTSB MIA04LA004](https://openairdocs.org/ntsb/MIA04LA004.md): Airbus Industrie A-319-112 · Tampa, FL · Accident · Serious injuries · Limited investigation · Final report · Oct 16, 2003 · N764US · No damage
  > An intermittent fault with the airplane's Brake Steering Control Unit (BSCU) for undetermined reasons, which resulted in a momentary loss of brakes and steering, and a serious injury to a flight attendant during the resultant sudden stop during taxi for…
- [NTSB ANC02IA007](https://openairdocs.org/ntsb/ANC02IA007.md): Douglas DC-8-71F · Anchorage, AK · Incident · No injuries · Incident investigation · Final report · Dec 14, 2001 · N825BX · No damage
  > The asymmetrical activation of the left wing spoiler due to a broken retraction cable during takeoff. A factor associated with the incident was the operator's inadequate inspection of the cable.
- [NTSB LAX02IA002](https://openairdocs.org/ntsb/LAX02IA002.md): Boeing 737-700 · Santa Ana, CA · Incident · No injuries · Incident investigation · Final report · Oct 10, 2001 · N615AS · No damage
  > The failure of the stabilizer electric trim motor as a result of internal mechanical seizure.
- [NTSB MIA01IA129](https://openairdocs.org/ntsb/MIA01IA129.md): McDonnell Douglas DC-8-71F · Nashville, TN · Incident · No injuries · Incident investigation · Final report · Apr 26, 2001 · N8076U · Minor damage
  > The failure of company maintenance personnel to install the correct hydraulic landing gear extension component, and the failure of company maintenance inspection personnel to comply with proper post maintenance test procedures, resulting in the impossibility…
- [NTSB SEA01IA039](https://openairdocs.org/ntsb/SEA01IA039.md): McDonnell Douglas DC-8-71F · Seattle, WA · Incident · No injuries · Incident investigation · Final report · Jan 16, 2001 · N8084U · No damage
  > A malfunctioning relay in the aircraft's flight management system (FMS) switching matrix and associated false "on course" indication on the captain's course deviation indicator (CDI), resulting in proper localizer course alignment not being obtained or…
- [NTSB DEN00IA032](https://openairdocs.org/ntsb/DEN00IA032.md): Boeing 737-347 · Salt Lake City, UT · Incident · No injuries · Incident investigation · Final report · Dec 24, 1999 · N305WA · Minor damage
  > Improper assembly of the wheel during build up in the operator's maintenance facilities.
- [NTSB SEA00IA019](https://openairdocs.org/ntsb/SEA00IA019.md): Boeing 737-400 · Portland, OR · Incident · No injuries · Incident investigation · Final report · Nov 11, 1999 · N772AS · Minor damage
  > Arcing in the electrical system wiring for undetermined reasons.
- [NTSB NYC99IA024](https://openairdocs.org/ntsb/NYC99IA024.md): Boeing 737-3TO · Newark, NJ · Incident · No injuries · Incident investigation · Final report · Nov 6, 1998 · N12318 · Minor damage
  > A loss of torque on the apex nut of the shimmy damper for undetermined reason(s), which resulted in a failure of the shimmy damper, and the subsequent failure of the lower torsion link of the right main landing gear.
- [NTSB CHI98IA095](https://openairdocs.org/ntsb/CHI98IA095.md): Airbus Industrie A-320-212 · Memphis, TN · Incident · No injuries · Incident investigation · Final report · Feb 16, 1998 · N341NW · Minor damage
  > the inadequate (bronze) material used by the fuel pump's manufacturer, which wore and ultimately blocked the fuel filter bypass and partially blocked the fuel nozzles, causing the fuel spray to burn through the low pressure turbine case.
- [NTSB SEA97IA071](https://openairdocs.org/ntsb/SEA97IA071.md): McDonnell Douglas DC-8-71F · Portland, OR · Incident · No injuries · Incident investigation · Final report · Mar 12, 1997 · N830BX · No damage
  > improper installation of four attach bolts on the elevator drive torque tube.
- [NTSB CHI97IA034](https://openairdocs.org/ntsb/CHI97IA034.md): Airbus Industrie A-320-211 · Romulus, MI · Incident · No injuries · Incident investigation · Final report · Nov 24, 1996 · N310NW · No damage
  > restricted movement of the autopilot mode engagement/disengagement lever bearing in the rudder artificial feel and trim unit. A factor relating to this incident was: company management not implementing the respective service bulletin.
- [NTSB CHI96IA207](https://openairdocs.org/ntsb/CHI96IA207.md): Airbus Industrie A-320 · Boston, MA · Incident · No injuries · Incident investigation · Final report · Jun 14, 1996 · N347NW · No damage
  > an undetermined intermittent fault in the trimmable horizontal stabilizer actuator system.
- [NTSB LAX96IA184](https://openairdocs.org/ntsb/LAX96IA184.md): Boeing 737-300-3H4 · Ontario, CA · Incident · No injuries · Incident investigation · Final report · Apr 30, 1996 · N331SW · Minor damage
  > The repair facility's improper assembly of the landing gear oleo strut during overhaul.
- [NTSB CHI96IA109](https://openairdocs.org/ntsb/CHI96IA109.md): Airbus Industrie A320-211 · Detroit, MI · Incident · No injuries · Incident investigation · Final report · Mar 18, 1996 · N340NW · No damage
  > a defective diode in the number two stabilizer actuator that produced an intermittent loss of electrical motor power during transient, closed loop control of the actuator. A factor was the intermittent open circuit in the elevator servo controller…
- [NTSB MIA95IA214](https://openairdocs.org/ntsb/MIA95IA214.md): Boeing 737-3B7 · Fort Lauderdale, FL · Incident · No injuries · Incident investigation · Final report · Aug 25, 1995 · N373US · No damage
  > Low electrical resistance of the autopilot aileron actuator for unspecified reasons which resulted in an uncommanded roll to the right.
- [NTSB FTW95IA348](https://openairdocs.org/ntsb/FTW95IA348.md): Boeing 737-3H4 · Lubbock, TX · Incident · No injuries · Incident investigation · Final report · Aug 18, 1995 · N309SW · Minor damage
  > installation of an incorrect bearing in the number three main wheel by the wheel assembly supplier, which led to subsequent failure of the wheel bearing and separation of the wheel during takeoff.
- [NTSB MIA95IA187](https://openairdocs.org/ntsb/MIA95IA187.md): Boeing 737-3B7 · Orlando, FL · Incident · No injuries · Incident investigation · Final report · Jul 18, 1995 · N390US · No damage
  > Contamination of the wiring harness and electrical connectors to the E-1-2 and E-1-3 shelf disconnect brackets in the electronics compartment, which resulted in an electrical fault and an uncommanded roll malfunction of the autopilot. A factor relating to the…
- [NTSB CHI95IA342](https://openairdocs.org/ntsb/CHI95IA342.md): Airbus Industrie A320-211 · Minneapolis, MN · Incident · No injuries · Incident investigation · Final report · Apr 28, 1995 · N331NW · No damage
  > inadequate design of the fly-by-wire flight control system which allowed false signals from the sidestick transducer units to generate uncommanded rolls.
- [NTSB CHI93IA354](https://openairdocs.org/ntsb/CHI93IA354.md): Boeing 737-300 · St. Louis, MO · Incident · No injuries · Incident investigation · Final report · Sep 8, 1993 · N350SW · Minor damage
  > a failure of the left outboard foreflap due to the loss of the bolts that hold the inboard sequencing carriage to the foreflap attach lug.
- [NTSB CHI90IA070](https://openairdocs.org/ntsb/CHI90IA070.md): Boeing B737-300 · Cedar Rapids, IA · Incident · No injuries · Incident investigation · Final report · Jan 20, 1990 · N338UA · Minor damage
  > The failure of all four main landing gear tires on takeoff due to the parking brake being locked.

## 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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('13802')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND 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?engine=13802&occurrence=130

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.