Battery Service; Air Filter Care - Piper PA-24-250 COMANCHE Pilot Operating Handbook

A~rcralt Publicmons
Pipcr Cornmchc 250 (Early blodcl)
3.)
Oil Requirements:
Ashless dispersant aircraft engine oil must be used for all operating conditions. The oil
capacity of the engine is 12 US quarts, but the operating level is normally kept a few quarts
below maximum to reduce oil consumption. It is recommended that the oil and filter be
changed and the oil screen be checked after every 50 hours of operation (25 hours if the engine
is not equipped with an external full flow, spin-on oil filter) or every four months, whichever
comes first. Under unfavorable conditions, the oil should be changed even sooner.
The following oil grades are required for the specified temperature:
Temperature Single-Viscosity Multi-Viscosity
All Temps.
Above 40 Degrees F. SAE 50
Below 40 Degrees F. SAE 30 15W50 or 20W50
Below 10 Degrees F.
SAE 20
During the oil and filter change it is advisable to inspect the overall condition of the engine
compartment giving attention to items not normally checked during a preflight inspection.
Hoses, metal lines and fittings should be inspected for signs of oil or fuel leaks, and checked
for abrasions, chafing, support and evidence of deterioration. Inspect the intake and exhaust
systems for cracks, evidence of leakage and security of attachment. Inspect wiring for loose,
broken or corroded terminals and any evidence of chafing, burning or heat deterioration.
4.) Battery Service:
Access to the 12-volt, 35 ampere-hour battery is obtained through the access panel at the right
rear side of the baggage compartment. The stainless-steel battery box has a plastic drain tube
which is normally closed off with a clamp and should be opened occasionally to drain off any
accumulation of liquid.
The battery should be checked frequently for proper fluid level. D o not fill the battery above
the baffle plates. Use only distilled water to replenish the electrolyte, never use acid.
A hydrometer can be used to determine the percentage of charge in the battery. If the battery
is not up to proper charge, re-charge following the instructions located on the battery-box
cover and in Section 1 (General) or Section 2 (Limitations) of this Manual under the heading
"Placards". Quick charges are not recommended.
5.) Air Filter Care:
The carburetor air filter must be cleaned at least once every 50 hours and more often, even
daily, when operating in dusty conditions To clean the early model square wire mesh filter,
wash in solvent and soak in SAE 10 or 20 weight oil and allow to drain thoroughly before re-
installation. On later model dry automotive type filters, tap the filter gently to dislodge dust
particles. Do not use compressed air or wash the dry filter in any liquid.
Copyright: 1993 Page
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