6 failure reports named the hsi in the last ten years, 77 since 1995, most often on the Boeing 767; the condition most often found was "malfunctioned". 2 FAA approvals let 1 company make a replacement hsi, Aviation Specialties Unlimited INC holding the most (2). The reports call it "hsi", "hsi/hdg warning".
Reports by year
Reports by year, as a table
reports
1995
5
1996
2
1997
7
1998
6
1999
6
2003
3
2004
4
2005
5
2006
2
2007
3
2008
1
2009
3
2010
5
2011
3
2012
8
2013
4
2014
4
2017
1
2018
1
2019
2
2020
1
2021
1
Which system the reports file it under last ten years
malfunctioned2failed1out of limits1smoke1spinning1
Conditions found, as a table
reports
malfunctioned
2
failed
1
out of limits
1
smoke
1
spinning
1
Approved replacement parts 2 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a hsi and sell it as an approved part for the models named. These are the companies holding such approvals for a hsi:
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.
