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temco(at)telusplanet.net
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 Posted: Sun Dec 03, 2006 6:00 pm Post subject: Failure Point |
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Jerry
I have all the KifoxSafe items and below is a pasted copy of Item 21 which
deals with the horizontal stabilizer rod ends.
Regards Ted
-------------------------------------------------------
#21 3/25/98
(MAJOR) (MODEL IV'S ONLY) HORIZONTAL STABILIZER
SUPPORT STRUTS BREAKING AT 3/16" THREADED END. Loss of horizontal
stabilizer support and possible Elevator control.
1. Replace support struts and rod ends with ones that are equipped with 1/4"
threaded ends.
2. Take extreme caution that the Horizontal Stabilizer is never used to move
the Aircraft around on the ground.
3. Inspect frequently.
4. Look for a method to "BEEF" up the joint.
5. (AT THE REQUEST OF SS) SS has a 1/4" strut kit for sale at a price of
$185. PART # 10581
-------------------------------------------------
-------SNIP------
Back then the list manager had a reguarly updated message called "Kitfox
Safe" where all the problems and potential problems and how to handle
them were listed. Unfortunately I have a relatively new computer and I
do not have a copy of Kitfox Safe. Perhaps someone else saved a copy?
Jerry Liles
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vadert(at)telusplanet.net
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| Posted: Sun Dec 03, 2006 7:10 pm Post subject: Failure Point |
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Ted
Could you post a list or a file of all the KitfoxSafe items. I'd like
to have a look at all of them. I haven't been on the list that long and have
never seen the list.
Thanks,
Tim Vader
Calgary
---
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donpearsall
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| Posted: Sun Dec 03, 2006 7:44 pm Post subject: Failure Point |
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Here is a list of "KitfoxSafe" items started by Don Smith. He put a lot of
effort into it and deserves Kudos.
Don Pearsall
______________
KITFOXSAFE CONCERNS AND COMMENTS
This is a list of safety concerns submitted by Kitfox builders and compiled
by Don Smythe <SmytheDF(at)supship.navy.mil>
KITFOXSAFE CONCERNS AND COMMENTS
KITFOXSAFE CONCERNS AND COMMENTS
********************************
* NEW CONCERN *
* THROTTLE CABLE CLUSTER SOCKETS *
********
#39
CONCERN: (MINOR) THROTTLE AND INJECTOR CABLES JUMPING THEIR SOCKETS;
DATE: 11-23-99
IMPACT: The barrels on the ends of the cables have been know to jump out
of the "sockets" at the throttle cluster. This will cause the
throttles or oil injection functions to be extremely out of sync.
"LIST": 1. Find a means (safety wire, tie wrap, etc.) to better hold the
cable ends in the cluster sockets.
********
#38
CONCERN: (MINOR) (PRIMARILY 582??) ROTAX STARTER GEAR SPRING BREAKING;
DATE: 9-30-99
IMPACT: Freezing up the Rotax starter and possible (but not likely)
damage
to starter and flywheel.
"LIST": 1. Periodically lubricate the starter gear/shaft.
2. NOTE: Reportedly, the Rotax/SS manual recommends lubricating
at each annual.
3. Possible choice for lubrication is motor cycle chain lube
oil.
It's designed with an anti-fling additive. Can be applied
without removing engine/starter.
********
#37
CONCERN: (MINOR)(582 ONLY) ROTARY VALVE RESERVOIR HOSES FAILING;
DATE: 7-23-99
IMPACT: Leaking or loss of rotary valve oil. Could result in
engine damage
"LIST": 1. Replace the original "braided" lines with an automotive type
hose.
2. NOTE: The engine fitting is 7/16" whereas, the original hose
is 3/8". This causes a stretching of the hose over the
fitting
and a potential stress point. Understand that 7/16" I.D. hose
might be hard to locate. Try a farm products outlet for
7/16" ID hose.
********
#36
CONCERN: (MAJOR) MIL-6000 RUBBER FUEL LINES SWELLING SHUT;
DATE: 7-22-99
IMPACT: Fuel starvation and engine failure. Recent incident resulted in
significant reduced power at landing. Mil-6000 lines were 3 years
old. Exterior inspection will not reveal the internal swelling.
"LIST": 1. Change Mil-6000 fuel lines to an automotive type,
Polyurethane,
or Tygon (translucent yellow #F-40-40-A)
2. Replace fuel lines at each annual or every other annual
3. Perform periodic fuel flow rate test.
4. Note fuel flow rate with/without filters installed. Insure
the addition of filters don't reduce fuel rates below spec
(150% of max fuel usage).
********
#35
CONCERN: (MAJOR) GSC CTA PROP HUB PISTON BEARING FREEZING
DATE: 7-19-99
IMPACT: There is a small bearing and piston in the prop hub that controls
the pitch of the blades. This bearing has a recommended
replacement of 100 hours. To date, two know failures have been
reported to the list. One at 40 hours of service and the other at
5 hours. Bearing failure causes the blades to fail to a fine
pitch
and the ability to maintain altitude may be lost.
"LIST": 1. Insure the failed (minimum) pitch will sustain flight. Adjust
if possible.
********
#34
CONCERN: (MINOR)(PRIMARILY SERIES V) FIBERGLASS SEAT BREAKING RESULTING
IN JAMMED CONTROL LINKAGE
DATE: 6-29-99
IMPACT: Breaking of the seat or seat coming loose from the fuselage
support tubes could result in the below control tubes becoming
Jammed. A complete loss of control of the aircraft could
occur.
"LIST": 1. Ensure the seat is properly and securely attached to the
fuselage tubing
2. Look at reinforcing the fiberglass seat in the areas where
it attaches to the tubes
3. Provide full length support from top to bottom (seat lips)
with either stainless strap or webbing of some sort.
4. Consider using metal hose clamps vice plastic tie wraps to
secure the seat.
5. Inspect the seat frequently for signs of cracking.
Especially after any hard landings.
********
#33
CONCERN: (MINOR) (532-582) FAILURE OF FLOAT GUIDES IN THE BING CARBS
DATE: 6-29-99
IMPACT: There was a article concerning the small guides in the Bing
carbs (floats) wearing due to vibration. Once the guides were
worn, the float body starts to wear and pieces of the float
found their way to the jets. The result is engine failure due
to fuel starvation. The guide in question is the bottom one.
"LISTS": Inspect the bottom and top guides where the push rod passes
through the float body frequently. Repair/ replace if
necessary.
********
#032
CONCERN: (MAJOR)(582ONLY) FAILURE OF PULSE DRIVEN FUEL PUMP DUE TO
PULSE LINE / PUMP DIAPHRAGM
DATE: 6-14-99
IMPACT: loss of engine due to failure of pump diaphragm or engine
pulse line
"LIST": 1. Check pulse line (and all fuel lines) frequently for cracks
and signs of drying out. Replace as necessary.
2. Consider replacing pulse lines and all other fuel lines at
regular annual intervals.
3. Consider overhauling or replacing the pulse operated fuel
pump at some regular interval (annual/bi-annual,etc.)
4. Consider the addition of a back up electrical pump.
5. CAUTION; a ruptured pump diaphragm will cause the engine
crankcase to flood with raw fuel through the engine pulse
line. A backup elec pump installed in series with the fuel
line will not help this situation.
6. CAUTION; a leaking pulse line could result in an extreme
lean engine mixture.
********
#031
CONCERN: (MINOR) SEPARATION OF THE BUTT RIB CAPSTRIP FROM THE BUTT
RIB
DATE: 5-5-99
IMPACT: During moderate to severe turbulence, a Kitfox had its
butt rib capstrip separate from the rest of the rib that
left a 1/2" gap between the windshield and the butt rib.
This condition could cause undo stress on the windshield
and premature breakage.
"LIST": Attach several short alum angle pieces on the inside of
the butt rib that will tie the horizontal capstrip to the
vertical rib. One member also used the alum pieces to
attach "nut plates" where he then bolted the windshield to
the capstrips vice pop-rivet.
********
#030
CONCERN: (MAJOR) SELECTION AND INSTALLATION OF FUEL FILTERS
DATE: 5-3-99
IMPACT: Fuel starvation due to improper filters or installation.
"LIST": 1. The glass Purolator filters are rated at 40-70 Micron.
The 40 rating is 50% effective whereas the 70 rating
is 98% effective. Possible good pre-filter at wing
tank.
2. Never use filters without knowing the Micron rating.
3. Paper element filters can clog if subjected to water.
4. Fiberglass fragments are "invisible" to the eye in
see through filters.
********
#029
CONCERN: (MAJOR) ELEVATOR TRIM MOTOR "HOUSING" BREAKING.
(SERIES 5 ONLY)
DATE: 3-8-99
IMPACT: Elevator is allowed to "flop" from limit to limit
resulting in uncontrollable elevator. (one Kitfox
lost to date. Unable to flare during landing)
"LIST": 1. Inspect housing frequently for signs of cracking.
2. Investigate a method to limit the elevator travel
if break occurs (cable, block, etc.).
********
#028
CONCERN: (MINOR) FLAPERON HINGE'S FREEZING
DATE: 2-5-99
IMPACT: Loss of Flaperon control
"LIST": 1. Lubricate with silicon or something to prevent
water build up in the hinge area.
2. Prevent water intrusion in wet climates
********
#027
CONCERN: (MAJOR) ROTAX 912 ENGINE MOUNTS CRACKING
DATE: 1/26/99
IMPACT: Loss of engine support
"LIST": 1. Three failures have been reported. One was first
hand and the other two were second hand reports.
2. Inspect carefully for any evidence of hairline
cracks starting to occur in the ASTM 4130 Chrome
Alloy tubing.
3. Re-weld and add sufficient additional support.
********
#026
CONCERN: (MINOR) POSSIBLE FUEL STARVATION
DATE: 12/22/98
IMPACT: Some circumstances can cause fuel starvation from the
wing tanks to the header tank
"LIST": 1. Ensure a continuous "downward" routing of fuel
lines from wing to header
2. Check filters frequently for fiberglass/Kreem
particles
3. Be cautious with "paper" type filters in areas
where water might be a factor.
4. Check fuel tank strainers frequently for
particles.
********
#025
CONCERN: (MINOR) BROKEN/CRACKED MUFFLERS ON THE 912 DUE TO
VIBRATION
DATE: 12/01/98
IMPACT: Possible fire in the engine compartment or
exhaust in cockpit
"LIST": 1. Re-weld and "Beef" up joints by adding
a steel bar to further support the exhaust pipe
2. Check at preflight by giving a tug on
the exhaust pipe
3. NDT (Dye Penetrate) at annual
********
#024
CONCERN: (MAJOR) ROTAX 912 OIL PRESSURE REDUCTION/LOSS
DATE: 11-19-98
IMPACT: Damage to engine or engine failure
"LIST": John King's problem has been isolated to a crimped
oil line caused by a hose clamp. The crimp was at a
short section of line at the oil filter fitting. The
Earl cooler appears "NOT" to be the problem. Other
members are still investigating their causes.
********
#023
CONCERN: (MAJOR) FUEL TANK COATINGS, CRACKING (KREEM);
DATE: 6-15-98
IMPACT: Engine failure; Fuel system contamination;
"LIST": 1. Remove old Kreem with MEK/Acetone
2. Re-coat tanks with new (Kreem) OR NOT
3. Inspect tank interiors regular for signs of
cracking or flaking of Kreem.
4. Inspect fuel samples for signs of white Kreem
particles
5. Clean tank strainers regularly.
6. Replace fuel filters regularly.
********
#022
CONCERN: (MAJOR) FUEL TANKS; FIBERGLASS FRAGMENTS CLOGGING
FILTERS; TRANSPARENT TO THE EYE THROUGH GLASS FILTERS
DATE: 7-20-98
IMPACT: Engine failure; Clogged fuel system
"LIST": 1. Replace filters regularly.
2. Cut open old filters and check for fragments and
other debris. Fiberglass particles have been
reported as transparent in the glass type
filters.
********
#021
CONCERN: (MAJOR) (MODEL IV's ONLY) HORIZONTAL STABILIZER
SUPPORT STRUTS BREAKING AT 3/16" THREADED END.
DATE: 3-25-98
IMPACT: Loss of horizontal stabilizer support and possible
Elevator control.
"LIST": 1. Replace support struts and rod ends with ones that
are equipped with 1/4" threaded ends.
2. Take extreme caution that the Horizontal
Stabilizer is never used to move the Aircraft
around on the ground.
3. Inspect frequently.
4. Look for a method to "BEEF" up the joint.
********
#020
CONCERN: (MAJOR) (PRIMARILY 912's ONLY) ROTAX IGNITION
MODULES; WIRES BREAKING
DATE: 3-25-98
IMPACT: Loss of ignition or, one half the ignition system
"LIST": 1. Relocate ign modules from the engine to the
firewall
2. Immobilize the Rotax wiring and provide extension
harness of MIL-Spec wiring and connectors.
********
#019
CONCERN: (MAJOR) RUDDER/BRAKE CONTROL TUBING; BREAKING
AT WELDS (SERIES IV ONLY)
DATE: 12-7-98
IMPACT: Loss of Rudder and Brake control
"LIST": 1. Install retrofit kit provided by Skystar
2. Install reinforcement straps around the tubing at
the welded joints. Weld or rivet in place
********
#018
CONCERN: (MAJOR) RUDDER JAM DUE TO REAR LOCATED RUDDER
ADJUSTMENT LINKS;
DATE: 3-25-98
IMPACT: Possible rudder jam at full rudder
"LIST": 1. Relocate the rudder pedal links to the pedal end.
2. Terminate the rudder cable on top of the rudder
arm and provide safety strap.
3. SS changed the design on the model IV sometime
around the beginning of 1996 and, this concern was
corrected.
********
#017
CONCERN: (MAJOR) FUEL VALVE; "O" RING DETERIORATION
DATE: 3-25-98
IMPACT: Engine failure due to "O" ring entering fuel line and
causing fuel starvation
"LIST": 1. Replace "O" rings with Viton material
2. Replace valve with Chrome ball and Teflon seat type
construction; rated for gasoline.
********
#016
CONCERN: (MAJOR) RUDDER CABLE RUBBING ON RUDDER STOP
DATE: 3-25-98
IMPACT: Wearing of the rudder cable; possible breakage and loss
of rudder control
"LIST": 1. Rudder jamming "concern" above. This correction also
raises the cable to clear the rudder stop.
2. SS changed design on the model IV sometime around the first
of 1996 and, this concern was corrected.
********
#015
CONCERN: (MINOR) FUSING OF THE BUS "FILTER CAPACITOR"
DATE: 3-25-98
IMPACT: Shorted capacitor could result in "Bus" voltage being
shorted to ground; Loss of 12VDC bus.
"LIST": Add an inline fuse to the input of the filter capacitor.
Will lose filter capability but maintain the Bus.
********
#014
CONCERN: (MINOR) LEAKING (POLY) HEADER TANKS
DATE" 3-25-98
IMPACT: Fuel contamination in the Cockpit area.
"LIST": 1. Apply small amount of heat to tank (poly) threads
prior to sealing.
2. Use a good quality sealant
********
#013
CONCERN: (MAJOR/MINOR) THROTTLE CABLE "BALL" ENDS; BREAKING
DATE: 3-25-98
IMPACT: (MAJ-582) Associated carburetor will fail "throttle
shut"; engine failure.
(MIN-912) Associated carburetor will fail full throttle
causing rough engine.
"LIST": Adjust throttle vernier so that positive stop of vernier
hits "just" prior to carburetor cups reaching full
travel. Allows the physical stop on the vernier to
contact first and prevents stress to the cable "ball"
ends at the carb cups.
********
#012
CONCERN: (MAJOR/MINOR) THROTTLE VERNIER CONNECTION TO THROTTLE
CLUSTER; SLIPPING
DATE: 3-25-98
IMPACT: Loss of throttle control. (MAJ-582) (MIN -912). See
comments on "THROTTLE CABLE "BALL" ENDS; BREAKING
"LIST": 1. Provide a more positive means to attach the solid wire
(center of vernier) to the throttle cluster.
2. Provide any extra "bug" nut sleeve assy between the throttle
cluster and the end of the outer throttle covering. Be careful
not to interfere with the idle or full throttle operation of
the
Vernier. Adjust the location to give you approximatly 75%
power
(582) if the original bug nut fails or slips.
3. SET SCREW ( OVAL POINT).. IS DESIGNED TO APPLY PRESSURE WITHOUT
CUTTING.. THIS
IS THE PREFERRED SET SCREW FOR USE ON
SMALL WIRES AND CABLES (i.e. throttle and brake
cables).. AS THERE IS NO CUTTING
SURFACE, CHANCES OF DAMAGING THE CABLE OR WIRE
ARE GREATLY REDUCED.
4. SET SCREW ( CUP POINT). IS DESIGNED FOR
USE WHERE SET SCREW MUST BITE INTO
MATING SURFACE..(i.e. a pulley of a
steel shaft).. IF THIS TYPE OF SET SCREW IS USED ON A
FLEXIBLE CABLE OR SMALL WIRE IT CAN
CAUSE DAMAGE. AS THIS SET SCREW CUTS INTO
THE MATING SURFACE IT REDUCES THE
STRENGTH OF THE CABLE/WIRE.. ON WIRES IT CAN
CAUSE A "STRESS RISER" WHICH CAN LEAD
TO A BREAK IN THE WIRE.
5. Try to use the "oval point" . If not
available, drill the set screw hole slightly offset from the wire hole so
the
"Cup point" type won't cut into the
wire.
********
#011
CONCERN: (MINOR) Fuel line and vents from wing tanks crimping
DATE: 3-25-98
IMPACT: Engine failure due to fuel starvation and loss of vent.
"LIST": 1. Ensure sufficient slack in lines for folding wings
but, ensure line is continually going down hill from
the wing tank to the header.
2. Inspect carefully for lines "approaching" a crimp
3. Investigate the installation of 90 degree fittings
where lines perform excessive bending; example, the
vent line.
*******
#010
CONCERN: (MINOR) Not choosing to rib Lace the Wings
DATE: 3-25-98
IMPACT: Separation of the fabric to the wing ribs during flight.
"LIST": Skystar and Poly Fiber seem to differ on their opinions
rib lacing. Skystar suggest rib lacing as an "Option".
Poly Fiber considers rib lacing as "Essential".
********
#009
CONCERN: (MAJOR) TUBULAR MAIN LANDING GEAR WELDMENTS;
CRACKING.
DATE: 3-25-98
IMPACT: Uncontrollable aircraft upon landing
"LIST": 1. Inspect weldment frequently for cracking.
2. Replace gear with the solid spring aluminum gear.
*******
#008
CONCERN: (MAJOR) (PRE-93) CRACKING FLYWHEELS ON OLDER 582's
DATE: 3-25-98
IMPACT: Engine destruction/failure
"LIST": 1. Inspect flywheel at first opportunity for cracks
radiating from the bolt holes.
2. Replace with new (heavier) flywheel. Rotax
Bulletin??? refers.
3. Inspect at each annual. Engine removal and partial
tear down preferred. Consider NDT (dye penetrate
test)
*******
#007
CONCERN: (MAJOR) ROTAX 912 ROCKER ARM SEIZURE
DATE: 3-25-98
IMPACT: Loss of power in cylinders depending on No. of cylinders
affected. possible damage to heads, valves, and pistons.
"LIST": 1. remove and inspect rocker arms for evidence of
scoring or seizure.
2. Replace with upgraded (Bronze Bushings) rocker arms
and replacement shaft.
3. Inspect old arms every 200 hours and replace at 600
hours to maintain 1200 TBO
*******
#006
CONCERN: (MINOR) BREAKING OF ROTAX EXHAUST SPRINGS
DATE: 4-6-98
IMPACT: Loss of support for the exhaust system
"LIST": 1. Inspect regularly and replace as necessary
2. Coat springs with high temp RTV
3. Look for a way to isolate the metal to metal
contact????
*******
#005
CONCERN: (MAJOR) GASCOLATOR AND QUICK DRAIN "O" RINGS
DATE: 4-8-98
IMPACT: Failed "O" rings can result in complete drainage of fuel
supply and resultant loss of engine.
"LIST": Inspect and/or replace all "O" rings in the gascolator
and quick drain valves at each annual or more frequently
as necessary.
*******
#004
CONCERN: (MAJOR) ROTAX 912 CARB SOCKETS CRACKING
DATE: 5-6-98
IMPACT: Rough running or failed engine
"LIST": 1. Inspect the rubber carb sockets regularly for a
secure fit and no cracking.
2. Consider replacing at regular intervals as necessary.
*******
#003
CONCERN: (MAJOR) TAIL SPRING MOUNTING BRACKETS/BOLTS BREAKING
DATE: 6-15-98
IMPACT: Loss of steering and tail control
"LIST": 1. Inspect the fuselage tabs for cracks (especially
after any hard landings).
2. Inspect the mounting bolts for signs of wear and
replace if necessary.
*******
#002
CONCERN: (MINOR) CLEVELAND BRAKE CYLINDERS SEPARATING
DATE: 7-27-98
IMPACT: An aircraft (not Kitfox) had a Cleveland brake cylinder
separate due to the "C" keeper ring coming loose. The
separation resulted in the upper part of the cylinder
rotating foreword and jamming against the firewall. This
jamming locked up the rudder. The pilot received fatal
injury.
"LIST": (1) Place a safety cable from the bottom of the cylinder
bolt hole to the top bolt hole. Adjust for no slack
with cylinder in neutral position. The cable will
prevent cylinder separation if keeper ring fails. The
cable will "bow" away when brake pedal is pushed.
*******
#001
CONCERN: (MAJOR) FRAYED AND BROKEN RUDDER CABLE (DURING LANDING)
DATE: 8-26-98
IMPACT: Loss of rudder control and ability to apply brake
"LIST": 1. If a rudder cable were to break, the opposite rudder
spring will cause the pedal to be pulled hard against
the firewall. This applies "unwanted" rudder and
prevents the use of the toe brake.
2. Inspect cables frequently, especially around the
pulley and guide tubes.
3. Never use MEK or such, to clean cables. It removes
the internal lubrication. Lubricate cables around
pulleys and guide tubes with graphite grease.
4. Provide a "stop" to prevent pedal from going hard
against the firewall if a cable breaks. This will
allow continued operation of the toe brakes to
overcome "unwanted" rudder while on the ground.
5. Consider cable replacement as a periodic maintenance
item.
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temco(at)telusplanet.net
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| Posted: Sun Dec 03, 2006 9:14 pm Post subject: Failure Point |
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Tim and Kitfox list
Don posted from 1 to 39 and here are the rest of the items up to item #47.
The first part is an index of the items as they pertain to various parts of
the aircraft.
Regards --- Ted
K I T F O X S A F E
# DATE ITEM COMMENTS
*** ********* INDEX:
HULL: #47 #46, #40, #39, #34, #31, #29, #28,
#21, #19, #18, #16, #13, #12, #9, #3, #1
582: #45, #43, #38, #37, #33, #32, #8,
912: #27, #25, #24, #20, #7, #4
FUEL: #44, #36, #30, #26, #23, #22, #17, #14,
#11, #5
PROP: #35,
ELECTRICAL: #15
GENERAL: #42, #41, #10, #6, #2
#47 06/15/02 RUDDER PEDAL TORQUE TUBES BREAKING This is an
addition to Item #19 where applicability is extended "ALL" model Kitfox.
#46 06/18/02
(MAJOR) LOOSE RIVETS ON FLAPERON HORN ASSY. The rivets holding the
flapperon horn to the flapperons has been discovers worn and loose on
several aircraft.
1. Replace the rivets with "solid core" type
2. Apply 3M or equivalent adhesive during the installation.
#45
(MAJOR) MISSING "SIEVE SLEEVES" IN BING CARBS (582 ONLY)
Failure to install the "sieve sleeves" in the carb bowls will result
in a very "lean" fuel mixture at high RPM's and may result in engine
seizure.
1. Ensure sleeves are in good condition
2. Ensure the sleeves are in place on the tower each time you complete the
jetting process or perform any carb maintenance.
3. The sleeves are not filters but, are for breaking up foam/bubbles in the
gasoline formed by vibration.
#44
(MINOR) MISSING OR LEAKING FUEL CAPS Can result in loss of fuel, uneven
or, catastrophic flow of fuel. Unusual amount of fuel loss. Transfer of
fuel from one tank to the other and over flowing.
1. Replace fuel cap gaskets with Mercedes-Benz part #140-471-00-79.
2. Ensure caps are installed correctly at each pre-flight.
3. Ensure the cap internal spring tabs are not bent or sprung to prevent a
tight fit.
4. Not related to fuel loss but, Icing will clog the cap vent rather
quickly and could reduce or prevent fuel flow from the tanks.
#43 01/04/01
(MINOR) ROTAX 582LC OVERHEATING Engines have experienced overheating
due to radiator size and location. A couple cases of thermostat failures
have been reported. Engine overheat can result in engine seizure.
1. The original 582 radiator may be undersized for some climates and fail
to provide adequate cooling.
2. Lowering the smaller radiator
approximately 1" putting it more in the
airstream, have been reported to improve cooling.
3. Going to the Rotax 618 radiator (larger) has improved cooling.
4. There has been at least, one report were the thermostat body had
"broken" causing the thermostat to fail in the shut position. Suggest
periodic inspections for metal stress to the thermostat body and possible
replacement each conditional.
#42 01/03/01
(MINOR) INACCURACIES OF ENGINE TACHOMETERS Faulty reading engine
tachometers can result in premature engine wear or engine failure.
1. Tachometer accuracy can be affected by temperature, dirt, wear,
electrical
Interference, etc.
2. Check accuracy of tachometer at initial installation and periodically
thereafter to determine reliability.
3. Verify prop speed with an optical tach.
4. One such problem reported in the Aviasport electronic tachometer for
Rotax engine type 912, due to temperature variation.
#41 04/17/00
(MINOR) PROTECTION OF OPEN FUEL, WATER, ETC. LINES DURING CONSTRUCTION
During the construction phase of building, bugs, Spiders, and other
insects/animals may build nest or
Leave residue in open fuel, water, or other lines laying around with the
ends unprotected. This applies to openings in radiators, engines,
instruments and anyplace a small creature could take up residence.
1. Insure all lines, instrument openings, radiators, engine ports are taped
or bagged during the building
phase and even after installation on the aircraft.
2. Prior to final hook up, ensure lines are clear of any debris by blowing
out with an air compressor or some
other acceptable means.
#40 12/21/99
(MINOR) ELEVATOR HINGE PINS FALLING OUT Some elevator hinge pins have
"smaller" heads that
will fit through the elev/stab weldments. In these cases, the hinge pins
would require a "washer" on BOTH ends. Most are a tight fit and should not
come out but, in case of wear, the pins "could" work out and.
1. Cut down the weldment width a little until the
existing pins will be long enough to install a washer on both ends. OR,
2. Order new pins with a longer length that will take two washers.
Subject: Re: Failure Point
Ted
Could you post a list or a file of all the KitfoxSafe items. I'd like
to have a look at all of them. I haven't been on the list that long and have
never seen the list.
Thanks,
Tim Vader
Calgary
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Sun Dec 03, 2006 10:20 pm Post subject: Failure Point |
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Thanks Ted and Don. This list is invaluable as it appears to be more
complete and more conservative than Skystar's SL list.
Guy Buchanan
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
Do not archive
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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dosmythe(at)cox.net
Guest
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| Posted: Mon Dec 04, 2006 3:39 am Post subject: Failure Point |
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Don P,
Thanks, I forget exactly why I stopped doing the "KITFOXSAFE" list but
it had something to do with retiring (the list was on my work computer),
having a computer crash and the backup copy didn't work. All this occurred
about the same time. Didn't know that anyone still had it.
Don S.
Do Not Archive
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lcfitt(at)sbcglobal.net
Guest
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| Posted: Mon Dec 04, 2006 6:55 am Post subject: Failure Point |
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As I recall, the aero tubing was offered when I ordered - late 1992, and it
was expensivce - the upgrade to a 1/4" fitting was offered after the reports
of breakage.
Lowell
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