# NTSB investigations, AK: Aircraft maintenance event

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 ANC21LA040](https://openairdocs.org/ntsb/ANC21LA040.md): Piper PA-18-105 Special · Gakona, AK · Accident · No injuries · Class 4 · Limited · Final report · May 10, 2021 · N5489H · Substantial damage
  > The pilot’s decision to initiate a flight with a failed mixture control cable which resulted in a total loss of engine power.
- [NTSB ANC20LA013](https://openairdocs.org/ntsb/ANC20LA013.md): Piper PA31 · Fairbanks, AK · Accident · No injuries · Class 3 · Limited · Final report · Jan 12, 2020 · N4112K · Substantial damage
  > The improper installation of a hydraulic line at the right main landing gear (MLG) unlock actuator, which resulted in a total loss of system hydraulic pressure and failure of the landing gear to extend. Contributing to the accident was the failure of the…
- [NTSB ANC19LA048](https://openairdocs.org/ntsb/ANC19LA048.md): Piper PA-18 · Fairbanks, AK · Accident · No injuries · Class 3 · Limited · Final report · Aug 30, 2019 · N1124 · Substantial damage
  > The inappropriate application of paint underneath the engine cylinder hold-down nuts, which resulted in inadequate torque and the subsequent in-flight separation of the No. 3 cylinder, and resulted in a total loss of engine power.
- [NTSB ANC18LA058](https://openairdocs.org/ntsb/ANC18LA058.md): Robinson R44 · Bettles, AK · Accident · No injuries · Limited investigation · Final report · Jul 29, 2018 · N744AK · Substantial damage
  > Maintenance personnel's application of insufficient preload on the attachment hardware for the idler gear shaft during engine overhaul, which resulted in the dismounting of the idler gear shaft assembly due to wear and deformation and the subsequent total…
- [NTSB WPR17FA108](https://openairdocs.org/ntsb/WPR17FA108.md): Piper PA 30 · Haines, AK · Accident · 2 fatal · Field investigation · Final report · May 27, 2017 · N7376Y · Substantial damage
  > The pilot's decision to turn toward the inoperative engine after conducting a low-level pass, which resulted in an aerodynamic stall at too low an altitude to recover. Contributing to the accident was the pilot's decision to perform the flight and the engine…
- [NTSB ANC17LA007](https://openairdocs.org/ntsb/ANC17LA007.md): Piper PA-18 · Bethel, AK · Accident · No injuries · Limited investigation · Final report · Nov 22, 2016 · N83641 · Substantial damage
  > The mechanic's failure to install a whistle slot in the engine breather tube, which resulted in a frozen tube, displacement of the crankshaft oil seal, a loss of oil, and smoke in the cockpit, which led to a forced landing.
- [NTSB ANC14FA050](https://openairdocs.org/ntsb/ANC14FA050.md): Piper PA 12 · Anchorage, AK · Accident · 1 fatal · Field investigation · Final report · Jul 2, 2014 · N3512M · Substantial damage
  > The incorrect (reverse) rigging of the elevator control cables, and the pilot’s inadequate preflight inspection, which failed to detect the misrigging.
- [NTSB ANC14LA035](https://openairdocs.org/ntsb/ANC14LA035.md): Dehavilland DHC-3T · Homer, AK · Accident · No injuries · Limited investigation · Final report · May 30, 2014 · N3125N · Substantial damage
  > The flutter failure of the right elevator servo tab due to the improper fabrication of the servo tab and maintenance personnel’s subsequent failure to detect anomalies with the servo tab.
- [NTSB ANC08LA113](https://openairdocs.org/ntsb/ANC08LA113.md): Cessna 206 · Galena, AK · Accident · Minor injuries · Limited investigation · Final report · Aug 31, 2008 · N4886U · Substantial damage
  > The en route loss of engine power due to a mechanic's failure to tighten a fuel line fitting, which became disconnected in flight.

## 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."eventStateOrRegion" = 'AK' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '040' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/040/sequence?state=AK

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