Cold wx Ops Flashcards
(27 cards)
To operate at very cold temperatures oil lines should be?
Insulated, not my intention if colder -15deg I won’t go flying.
Should you reduce engine cooling in winter?
Yes,
Sponge on front of engine intake
Aluminum heat tape on oil filter
What does oil do?
Lubricates
Cools
Seals
Cleans
*Have proper viscosity for winter ops (SAE)
Is multi-viscosity oil good?
Yes
Adds engine life for Start, Oil pump, Oil Cooler, Prop Governor, and Batteries
What by-products does my oil clean?
Rust, Corrosion, Acids, Varnishes
Can you fly at temp below my oil’s SAE rating?
Never
What is the Pour point?
Lowest temp oil will flow without any disturbing force
What is an odd byproduct of all combustion?
Moisture!
Some remains in the crank and must exit via the crankcase breather line, so that cannot be frozen shut!
What must I ensure on my preflight?
The crankcase breather line is free of ice!
What does cabin heat prevent?
My breathing from fogging up the windows on the inside!
What can you do if Cabin heat fails?
Open all air vents and land Asap! It gets very uncomfortable, very quickly.
Must I be wearing my cold weather gear prior to takeoff?
Yes
What can you do with Battery if there is no provision to charge it?
Remove it and carry it inside with me where I sleep (same as oil), do I have a container for the oil?
Below 0deg C, what % degradation is occuring with my battery?
50% or so
What type of household battery resists cold the best?
Dry-Cell ‘Alkaline’
If used infrequently, reverse one battery so they don’t accidentally discharge.
(Rechargeable are not suitable)
What can assist an engine cold start at -20deg C?
Multi-viscosity oil
Heat (small fire under cowling)
You will damage engine anytime OAT is colder than minus ‘ x ‘ deg and engine is started without preheat.
-7 deg C
Even assuming you have proper SAE oil
Can I refuel my plane while my Honda Generator is running for preheat?
No, spill fuel fire on Gen and Kaboom
Metal bits on Gen are ‘very’ hot, and electric sparks with Fumes
Does a blanket over the cowling help preheat?
Yes
Ideally an insulated engine blanket.
Where is best place to direct preheat?
Oil pan at bottom of engine, it’s all about the oil, not the cylinders.
What is recommended with regards to the Prop, prior to a very cold start (i.e. -10deg or Colder)
Propeller turned over carefully, at least 4 times by Hand.
Max time can operate starter motor?
90 sec, then 1min break
Subsequently 30sec at a time with 1min break (max 5 times per hour)
What happens when you over-prime?
Scoring of cylinder walls (burnt),
Hard starting (larger explosion at first),
Possible induction fires…must keep cranking the engine to suck it back in.
Never more than 3-4 shots of Primer
After a cold start, can the Carburator still have trouble vaporizing fuel?
Yes, so immediately put on ‘Carb Heat’ until engine runs smooth,
