56 failure reports named the sequence valve in the last ten years, 364 since 1995, most often on the Boeing 757; the condition most often found was "malfunctioned". 9 FAA approvals let 3 companies make a replacement sequence valve, Shimadzu Precision Instruments, INC. holding the most (4). The reports call it "sequence valve", "sequence valve".
Reports by year
Reports by year, as a table
reports
1995
5
1996
11
1997
26
1998
15
1999
8
2000
18
2001
14
2002
19
2003
12
2004
14
2005
12
2006
12
2007
13
2008
28
2009
19
2010
9
2011
18
2012
12
2013
12
2014
17
2015
14
2016
5
2017
9
2018
3
2019
17
2020
4
2021
2
2023
3
2024
3
2025
3
2026
7
Which system the reports file it under last ten years
Approved replacement parts 9 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a sequence valve and sell it as an approved part for the models named. These are the companies holding such approvals for a sequence valve:
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.
