Test Switch
41 failure reports named the test switch in the last ten years, 61 since 1996, most often on the Mcdonnell Douglas MD-11; the condition most often found was "inoperative".
Reports by year
Reports by year, as a table
| reports | |
|---|---|
| 1996 | 5 |
| 1997 | 5 |
| 2013 | 2 |
| 2014 | 3 |
| 2015 | 5 |
| 2016 | 3 |
| 2017 | 4 |
| 2018 | 4 |
| 2019 | 4 |
| 2020 | 4 |
| 2021 | 2 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 2 |
| 2025 | 7 |
| 2026 | 6 |
Which system the reports file it under last ten years
Cabin, seats and restraints14Emergency equipment14Electrical power10Fuel system1Landing gear1Airframe structure1
Reports by system, as a table
| reports | |
|---|---|
| Cabin, seats and restraints | 14 |
| Emergency equipment | 14 |
| Electrical power | 10 |
| Fuel system | 1 |
| Landing gear | 1 |
| Airframe structure | 1 |
Models most often reporting it last ten years
How it failed the condition found, last ten years
inoperative12broken5sticking5faulted3damaged2failed2intermittent2malfunctioned2crew error1defective1
Conditions found, as a table
| reports | |
|---|---|
| inoperative | 12 |
| broken | 5 |
| sticking | 5 |
| faulted | 3 |
| damaged | 2 |
| failed | 2 |
| intermittent | 2 |
| malfunctioned | 2 |
| crew error | 1 |
| defective | 1 |
Engines most often reporting it
Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.