Hydraulic System; Engine Oil System - Thrush Aircraft S2R–T660 Maintenance Manual

The hydraulic system consists of two master brake cylinders and the necessary hydraulic lines
connecting the master cylinders to the wheel brake cylinders. Applying toe pressure on the rudder
pedals actuates the master cylinders, which are located just aft of the pilot's rudder pedals. Refer to
Section Six (pages 6-10 thru 6-13) for brake servicing procedures.
The oils that are specified for the lubrication system are detailed in the Pratt and Whitney Canada
Service Bulletin 13001. All oils listed in the bulletin are approved for flight operation. It is
recommended for all turbo aircraft that the oil should be changed every 400 hours. The oil system
contains 13 U.S. quarts.
In cases where oils that are approved are not available, an operator must obtain prior approval or
recommendations for use of substitution oil from the Service Department, Pratt and Whitney
Canada Corp, 1000 Marie-Victorin, Longueuil, Quebec, Canada J4K 1A1.
A. OIL LEVEL CHECK To avoid overfilling of oil tank, and high oil consumption, an oil level check is
recommended within 30 minutes after shutdown. Ideal interval is 15 to 20 minutes. If more
than 30 minutes has passed, and the dipstick indicates that oil is needed, start the engine and
run at ground idle (low idle) for five minutes, and recheck oil level.
1. Unlock the filler cap and dipstick from the filler neck at the eleven o'clock
position on the accessory gearbox and remove the filler cap.
Do not mix different brands, viscosity's, or types of oil since their
chemical structures may make them incompatible. If different types of
oil become mixed, drain and flush the system. Refill with new oil.
2. Check the oil tank contents against the markings on the dipstick. Service
as required.
Effective: 12/17/03
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL

HYDRAULIC SYSTEM

ENGINE OIL SYSTEM

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