Module 7.13 Flashcards
how can you check the quality of a compression fitting that has been swaged onto a control cable?
with a go/ no go gauge
what is the longest that can have an end fitting swaged onto it?
3/8’’ in diameter
where should the swaging of the terminal fitting start ?
-put cable in. mark the point on the cable at the end of the fitting, take it out and mark the length on the barrel then from here mark on diameter back
if the cable has a plastic coating, what must be done before swaging?
removal of the plastic coating
how can you stop the cable moving inside the fitting before swaging?
place half in, the bend enough to hold the cable in
what are the methods of swaging?
- hand
- hydraulic/ pnuematic
what % of it’s breaking strength must a cable be tested to ?
60% of it’s breaking strength
how must the testing load on the cable be applied?
gradually, and held for at least 3 mins
how many compressions does a nicopress termination have ?
3
how much should the cable extend out the fitting once looped back?
1/8’’
what is a safety feature added to nicopress to help inspection
paint band to check for slippage
what is the recommended inspection interval for control cables
annual or 100 hours
how should you check for fraying on a control cable?
run a cloth up and down the cable
when does blending usually occur?
when outer wires are worn out by 40% - 50%
how should a pully be set up?
so no sideways forces are acting
what should the cable be when inspecting the pulley?
slack
what must fairleads never be used for?
changing direction
what is a fairlead made of?
soft plastic or fibre
how are pressure seals created?
filled with grease
what must all pulleys have?
guard pins
what must be done to a cable before it can be used? and how might this load be applied?
pre load the cable by applying at steady speed for 5 mins
when are cables allowed to be pre-loaded?
when they are not bent
if the cable is over 30m how can it be pre loaded?
over a moveable guide pulley
how must cables be tensioned throughout the system?
evenly with the use of turnbuckles
what are the two types of locking method for turnbuckles?
locking wire or locking clips.
how do you measure the tension of an aircraft cable?
tensiometer
what acuracey does a tensiometer have?
98%
where should tension be measured?
on long stretches, not near pulleys.
how is a reading obtained on a tensiometer?
wire under the anvils and user pushes up onto the cable
what should be used in the cable system to get good tensioning results?
rigging pins and gust locks
what is a bowden cable normally made from?
CRES
what is the construction of a bowden cable?
inner CRES cable, coiled wire around which is covered in cotton braiding
what are the two methods of returning a bowden cable?
spring or having two cables
what are the two methods of adjusting bowden cable tension?
adjustable stop or double ended stop?
how is the tee barrel secured to the barrel?
nut with a lock nut
when would a double ended stop be used?
when there is limited access
on a double ended stop, what is the tee barrel replaced with?
internally threaded tube with witness holes
where on the cable are the hand levers located?
transmitting end
what are the three types of hand lever
-plain
-ratchet type
-thumb
how much throw in a radial motion do ratchet and plain type have?
90mm
how many pulls does the ratchet type hand level allow?
more than one
thumb type hand levers have a shorter lever, what does this mean?
35mm throw
what is the simplest inspection method?
move cable the whole motion and hold with a cotton cloth
what are two benefits to teleflex cables?
-much stronger than bowden
- push and pull action
what wrap should single and double teleflex cables be?
40 degree and 180 degree
how often should control cables be inspected?
every 100 hours or annually
where is the most common place for control cable damage?
at bends
where should cables be inspected for correct tension, damage and route security?
engine control and flight control
