Interlock

10 failure reports named the interlock in the last ten years, 14 since 1995, most often on the Boeing 737; the condition most often found was "broken". 1 FAA approvals let 1 company make a replacement interlock, Adams Rite Aerospace INC holding the most (1).

Reports by year

Reports by year, as a table

	reports
1995	1
1998	1
2011	1
2014	1
2017	2
2019	1
2020	1
2021	1
2023	1
2024	2
2025	1
2026	1

Which system the reports file it under last ten years

Landing gear5Airframe structure3Flight controls2

Reports by system, as a table

	reports
Landing gear	5
Airframe structure	3
Flight controls	2

Models most often reporting it last ten years

Boeing 7374Airbus A3201Airbus A3211Boeing 7671Boeing 7771Mcdonnell Douglas MD-101Mcdonnell Douglas MD-111

Models most reported, as a table

	reports
Boeing 737	4
Airbus A320	1
Airbus A321	1
Boeing 767	1
Boeing 777	1
Mcdonnell Douglas MD-10	1
Mcdonnell Douglas MD-11	1

How it failed the condition found, last ten years

broken2inoperative2malfunctioned2detached1lack of lube1missing1out of rig1

Conditions found, as a table

	reports
broken	2
inoperative	2
malfunctioned	2
detached	1
lack of lube	1
missing	1
out of rig	1

Approved replacement parts 1 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a interlock and sell it as an approved part for the models named. These are the companies holding such approvals for a interlock:

Adams Rite Aerospace INC 1

For these models most: Mcdonnell Douglas DC-10 (1).

Maker	Part	Replaces	Fits	Granted	Status
Adams Rite Aerospace INC	Interlock Assembly 2771-35	2771-35	McDonnell Douglas DC-10-10, DC-10-10F, DC-10-15	2002-04-10	current

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.