January/February 2023 - 24

OILS & LUBRICANTS
Engine Oil
Impacts
by Mario Pierobon
AIR FRANCE INDUSTRIES
KLM ENGINEERING &
MAINTENANCE
T
24 JANUARY/FEBRUARY 2023
he peculiarities of aviation oils are
many. They must be able to withstand
high temperatures, and they
must be compatible with seals,
paint, and composite materials. In
this feature, we have reached out
to industry experts to define best
practices on the selection and use of aviation
oils.
According to Martyn Horstink of the Amsterdam
Engineering Team at Air France Industries KLM
Engineering & Maintenance, it is important to concentrate
on high performance capability (HPC) oils.
" The use of the non-HPC oils will decrease as these
oils causes thermals stability issues at higher temperatures
which could lead to maintenance burden, "
he says. " The HPC oils are favoured for their superior
thermal and oxidation stability over a wide range
of operating conditions. "
According to David Fojón, president and chief
executive officer (CEO) of Avioparts, an important
aspect of aviation oils is that they must have
improved compatibility with seals, paint and various
composite materials. " All the engine-approved
oils must be miscible and compatible with one
another in all proportions. This is a mandatory
test requirement in the equipment manufacturers'
approval procedures, " he says.
Occasionally there is a
need to change an engine to
a different oil and some precautions
should be applied
before making a change,
explains Fojón. " O-ring elastomer
seals in the engine
should achieve an acceptable
equilibrium between
the compression set and the
lubricant swelling action. A
sudden change to a lubricant
with a different formulation
can disturb that equilibrium.
The slow introduction of
the new oil will lessen these
effects, " he says.
Oil deposits produced by
the previous lubricant can
be removed from the formulation
site by a different oil,
affirms Fojòn. " Due to the
very wide range of deposit
types encountered, it is not possible to fully predict
this effect. It has been noted that the deposit loosening
effect is not as prominent if the changeover is
made slowly, " he says. " The previous oil should be
satisfactory for continued use. For both ecological
reasons and for cost-effectiveness, this oil is not
typically drained from the system. Change by topoff
(mixing) allows the changeover to take place
slowly, and there is increasing evidence that this is
less of a shock to the engine and engine oil system.
So, while most engine manufacturers allow change
by top-off (mixing), other engine manufacturers do
not and only allow changeover by either drain and
refill, or drain, flush and refill. "
AIRCRAFT MAINTENANCE TECHNOLOGY

January/February 2023

Table of Contents for the Digital Edition of January/February 2023

EDITOR’S TAKEOFF
Industry Inspection
Business Aviation Maintenance Outlook Report
Composite’s Continual Growth
Borescopes, an Inside View
Engine Oil Impacts
NFPA 409 and Fire Suppression in 2023
Technicians Demonstrate Knowledge, Skill and Integrity at the Aviation Maintenance Competition Presented by Snap-on
FOR THE RECORD
ARSA INSIGHT
One WAAG Windshield Repair Stand Can Serve Multiple Narrow- or Wide-body Aircraft
Products
Advertiser’s Index
January/February 2023 - 1
January/February 2023 - 2
January/February 2023 - 3
January/February 2023 - EDITOR’S TAKEOFF
January/February 2023 - 5
January/February 2023 - Industry Inspection
January/February 2023 - 7
January/February 2023 - Business Aviation Maintenance Outlook Report
January/February 2023 - 9
January/February 2023 - 10
January/February 2023 - 11
January/February 2023 - 12
January/February 2023 - 13
January/February 2023 - 14
January/February 2023 - 15
January/February 2023 - Composite’s Continual Growth
January/February 2023 - 17
January/February 2023 - 18
January/February 2023 - 19
January/February 2023 - Borescopes, an Inside View
January/February 2023 - 21
January/February 2023 - 22
January/February 2023 - 23
January/February 2023 - Engine Oil Impacts
January/February 2023 - 25
January/February 2023 - NFPA 409 and Fire Suppression in 2023
January/February 2023 - 27
January/February 2023 - 28
January/February 2023 - 29
January/February 2023 - Technicians Demonstrate Knowledge, Skill and Integrity at the Aviation Maintenance Competition Presented by Snap-on
January/February 2023 - 31
January/February 2023 - 32
January/February 2023 - 33
January/February 2023 - FOR THE RECORD
January/February 2023 - ARSA INSIGHT
January/February 2023 - One WAAG Windshield Repair Stand Can Serve Multiple Narrow- or Wide-body Aircraft
January/February 2023 - 37
January/February 2023 - Products
January/February 2023 - 39
January/February 2023 - 40
January/February 2023 - 41
January/February 2023 - Advertiser’s Index
January/February 2023 - 43
January/February 2023 - 44
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