STORAGE

TTP	B1-L1	ATA10
Cessna 172	B2-L1

Flyable Storage  is a maximum of 30 days storage with no engine operation and/or the first 25 hours of intermittent engine operation.
Engine temperature and length of operation time are very important in the control of corrosion. The desired flight time for air cooled engines is at least one continuous hour at oil temperatures of 165 degrees F (74 degrees C) to 200 degrees F (93 degrees C) at intervals not to exceed 30 days. The one hour does not include taxi, take-off and landing time. Temperature gages must operate correctly. The cooling air baffles must be in good condition and fitted properly. The oil cooler system must be of the proper size for the engine and airframe installation. Oil coolers that are not the correct size can cause an engine overheat condition or below minimum temperatures. Low temperatures are as dangerous as high temperatures because of build-up of water and acids.
Pulling engines through by hand when the airplane is not operated for approximately a week is not recommended. Pulling the engine through by hand before you start the engine or to minimize corrosion can cause damage. The cylinder walls, pistons, rings, cam and cam follower receive minimum lubrication. When the prop is pulled through by hand, the rings remove oil from the cylinder walls. The cam load made by the valve train removes oil from the cam and followers. After two or three times of pulling the engine through by hand without engine starts, the cylinders, cam and followers are left without the correct
quantity of oil film. Engine starts without the correct lubrication can cause the engine parts to score which can cause damage to the engine.
Pitot tube, static air vents, air vents, openings in the engine cowl, and other openings must have protective covers installed to prevent entry of foreign object debris.
Temporary Storage- is when the airplane does not operate in a maximum of 90 days. The airplane is made of corrosion resistant, epoxy primed aluminum, which will last a long time in normal conditions. But these alloys can have oxidation. The first indication of corrosion on surfaces without paint is white deposits or spots. Corrosion on surfaces with paint is discoloration or blistered paint. Storage in a dry hangar is very important for good preservation. Different conditions will change the measures of preservation, but for normal conditions in a dry hangar, and for storage periods not to exceed 90
days, the procedures that follow are recommended.

PTP Cessna 172	B1	LOC		SGH
	B2	LOC		SGH

(a) Fill the fuel tanks with the correct grade of fuel.
(b) Use tie-down rings for ground points for the fuel procedure.
(c) Clean the airplane fully.
(d) Clean oil or grease from the tires.
(e) Put a thin layer of tire preservative on the tires.
(f) Put a cover on the tires to keep grease and oil from the tires.
(g) Keep the tires from deformation. - Put the fuselage on blocks to relieve pressure on the tires or rotate the wheels every 30 days to keep the tires from flat spots.
(h) Lubricate all airframe items.
(i) Put a cover on openings which let moisture and/or dust to enter.
Temporary engine storage.
(1) If it is known that an aircraft is to be out of operation for 30 or more days, the procedures that follow must be applied to the engine.
(a) Put a preservative in the engine by one of the methods that follow.
1 Drain the oil from the sump or system and replace with a preservative oil mixture. This
preservation mixture is one part by volume of MIL-C-6529C Type I concentrated preservative compound added to three parts by volume of MIL-L-6082C (SAE J1966), Grade 1100, mineral aircraft engine oil or oil that agrees to MIL-C-6529C Type II. Carefully follow the manufacturer's instructions before use.
2 An alternative method is the use of Cortec VC1-326 preservative concentrate added to the
original oil at a ratio of one part VC1-326 to ten parts of oil.
(b) Operate the engine to get the normal temperatures of operation.
1 Do not stop the engine until the oil temperature is 180 degrees F (82 degrees C). If weather conditions are below 32 degrees F (0 degrees C), oil temperature must be at least 165 degrees F (73 degrees C) before shutdown.
(c) Remove the engine cowl to get access to the top spark plugs.
(d) Remove the spark plugs.
NOTE: Oils of the type given are to be used in Lycoming aircraft engines for preservation only and not for lubrication.
(e) Through the spark plug hole, spray the interior of each cylinder with approximately two ounces of the preservative oil mixture with an airless spray gun (Spraying Systems Co., Gunjet Model 24A-8395 or equivalent). If an airless spray gun is not available, a moisture trap can be installed in the air line of a conventional spray gun.
(f) Install the spark plugs.
(g) Do not turn the crankshaft after the cylinders have been sprayed.
(h) If the aircraft is stored in a region of high humidity, or near a sea coast, it is better to use
dehydrator plugs and not the spark plugs. Cylinder dehydrator plugs, MS-27215-2 or equivalent, can be used.
(i) Before the engine has cooled, install small bags of desiccant in the exhaust and intake ports and seal with a moisture impervious material and pressure sensitive tape.
(j) Firmly attach red cloth streamers to any desiccant bags installed in the intake and exhaust passages to make sure the material is removed when the engine is made ready for flight. Streamers must be visible from outside the aircraft. Thr propeller must have a label that says "Engine preserved - do not turn propeller".
(k) Seal all engine openings with plugs. Attach a red streamer at each point that a plug is installed.
(l) If the airplane is to be stored outside, the pitot tube, static source vents, air vent openings in the engine cowl, and other openings must have protective covers installed to prevent entry of foreign object debris.
(m) Attach a warning placard to the propeller that says the propeller must not be moved while the engine is in storage.
(n) At 15-day maximum intervals, a periodic check must be made of the cylinder dehydrator plugs and desiccant. When the color of the desiccant has changed from blue to pink the preservation procedure must be repeated.
WARNING: To prevent serious bodily injury or death, before the propeller is moved, obey all precautions to prevent the engine start. Disconnect the spark plug leads. Make sure the magnetos are switched off and P-leads are grounded. Make sure the throttle is closed and the mixture is in idle cut-off. Do not stand within the arc of the blade. Even without spark, compression can cause the propeller to move with sufficient force to cause serious injury.
C. Return the airplane to service.
(1) To return the airplane to service, remove seals, tape, and desiccant bags. Use solvent to remove tape residue. Remove spark plugs or dehydrator plugs. With the magnetos off, turn the propeller by hand through sufficient rotation to remove excess preservative oil from the cylinders. Drain the remaining preservatives from the engine through the sump.
(2) Install spark plugs and reconnect all parts in accordance with manufacturer's instructions. Service the engine with approved lubrication oil.
 Inspection During Storage - Do an inspection of the airplane.
(1)  for corrosion at least once a month and remove dust collection as frequently as possible. Clean the airplane as required.
(2)  at least one cylinder through the spark plug hole for corrosion at least once a month.
NOTE: Do not move crankshaft when the interior of the cylinders is examined for corrosion.
(3) If at the end of the 90 day period, the airplane is to be continued in storage, repeat the 90-day storage procedure.