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1. 02:18 PM - KLX 135A issues (vanremog@gmail.com VanRemortel)
2. 08:10 PM - KLX 135A Issues (Gary VanRemortel)
Message 1
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Many RV builders in the =9890s installed a Bendix/King KLX 135A Nav/C
omm as
part of their avionics suites, right up until everything changed and
sophisticated Glass Panel Displays from Dynon, Garmin and the like started
to become available. I=99d like to get just a few more years out of
my steam
gauges, original VM1000 and conventional radio stack setup before I fully
upgrade my panel. I use an ASUS tablet running Avare for navigation these
days, so the KLX 135A moving map is my backup, and I have ADS-B in/out.
I=99ve had a few issues with the KLX 135A that many may soon experien
ce. My
unit, originally installed new in 1997, now has ~1100 operational hours. I
have a copy of the Maintenance Manual to reference for replacement parts,
however Honeywell Bendix/King has been somewhat less than accommodating of
end users in this regard, instead allowing only shops like South Eastern
Aerospace to buy parts and do their repair work. Don=99t get me wron
g, SEA
is a great shop, but boxing up and sending my unit off to FL for 6wks is
not always a good option. Since retiring, I no longer have access to test
equipment necessary for proper troubleshooting, but I am a USAF trained
technician, comfortable with SMD defense electronics repair. So when I see
a simple circuit with a simple problem, I assume I can fix it straightaway,
if I can get part(s).
The KLX 135A was a solid Nav/Comm at the time, but like all electronics,
some components are inherently life-limited. Tadiran TL-5135 battery on
digital board requires periodic replacement, Aluminum electrolytic filter
capacitors on power supply and audio boards dry out, LCD display on main
board bleeds out and reflector photo interrupters on frequency tuning dials
get weak. Heat the unit sees when parked on the ramp non-operating
contributes significantly to limited life.
My internal battery has been replaced twice, once by LAC in San Jose, CA
and more recently by SEA, but I=99ve been told it is a relatively sim
ple DIY
job. LAC replaced the power supply and audio capacitors after us having to
phone up the tower and go NORDO into KLVK one day, and more recently SEA
replaced the LCD. When tuning of the decimal digits in the radio section
began to get sluggish and didn=99t always increment/decrement properl
y during
rotation, I examined the unit and reviewed the simple circuit. My EE buddy
told me the IR LEDs in the photo interrupters were likely getting weak due
to age. After buying the last B/K 007-08094-000 parts I could find in the
states and replacing them, the unit now operates 5by5. The unit should
last another 5 years. Honeywell won't have more parts until Nov 2020.
-GV RV-6A N1GV
Message 2
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Many RV builders in the =9890s installed a Bendix/King KLX 135A Nav/C
omm as
part of their avionics suites, right up until everything changed and
sophisticated Glass Panel Displays from Dynon, Garmin and the like started
to become available. I=99d like to get just a few more years out of
my steam
gauges, original VM1000 and conventional radio stack setup before I fully
upgrade my panel. I use an ASUS tablet running Avare for navigation these
days, so the KLX 135A moving map is my backup, and I have ADS-B in/out.
I=99ve had a few issues with the KLX 135A that many may soon experien
ce. My
unit, originally installed new in 1997, now has ~1100 operational hours. I
have a copy of the Maintenance Manual to reference for replacement parts,
however Honeywell Bendix/King has been somewhat less than accommodating of
end users in this regard, instead allowing only shops like South Eastern
Aerospace to buy parts and do their repair work. Don=99t get me wron
g, SEA
is a great shop, but boxing up and sending my unit off to FL for 6wks is
not always a good option. Since retiring, I no longer have access to test
equipment necessary for proper troubleshooting, but I am a USAF trained
technician, comfortable with SMD defense electronics repair. So when I see
a simple circuit with a simple problem, I assume I can fix it straightaway,
if I can get part(s).
The KLX 135A was a solid Nav/Comm at the time, but like all electronics,
some components are inherently life-limited. Tadiran TL-5135 battery on
digital board requires periodic replacement, Aluminum electrolytic filter
capacitors on power supply and audio boards dry out, LCD display on main
board bleeds out and reflector photo interrupters on frequency tuning dials
get weak. Heat the unit sees when parked on the ramp non-operating
contributes significantly to limited life.
My internal battery has been replaced twice, once by LAC in San Jose, CA
and more recently by SEA, but I=99ve been told it is a relatively sim
ple DIY
job. LAC replaced the power supply and audio capacitors after us having to
phone up the tower and go NORDO into KLVK one day, and more recently SEA
replaced the LCD. When tuning of the decimal digits in the radio section
began to get sluggish and didn=99t always increment/decrement properl
y during
rotation, I examined the unit and reviewed the simple circuit. My EE buddy
told me the IR LEDs in the photo interrupters were likely getting weak due
to age. After buying the last B/K 007-08094-0000 parts I could find in the
states and replacing them, the unit now operates 5by5. The unit should
last another 5 years. Honeywell Bendix/King says they won=99t have m
ore of
these parts until November 2020 but they can be reached at
techsupport@bendixking.com
-GV RV-6A N1GV
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