GRUMMAN AMERICAN
FOR TRAINING USE ONLY – SECTION 8
MODEL GA-7/COUGAR
HANDLING, SERVICE & MAINTENANCE
8-7
Issued: April 10, 1978
SERVICING (See Figure 8-1)
In addition to the preflight inspection in Section 4, servicing, inspection, and test requirements for your airplane
are detailed in the maintenance manual. The maintenance manual outlines all items which require attention at 50,
100, and 1000 hour intervals plus those items which require servicing, inspection, and/or testing at special
intervals.
Depending on various flight operations, your local Government Aviation Agency may require additional service,
inspections, or tests. For these regulatory requirements, owners should check with local aviation officials where
the airplane is being serviced.
For quick and ready reference, quantities, materials, and specifications for frequently used service items are as
follows:
ENGINE OIL
GRADE –
Aviation Grade SAE 50 Above 60°F (16°C)
Aviation Grade SAE 10W30 or SAE 30 Between 0°F (-18°C) and 70°F (21°C)
Aviation Grade SAE 10W30 or SAE 20 Below 10°F (-12°C)
Multi-viscosity oil with a range or SAE 10W30 is recommended for improved starting in cold weather. Ashless
dispersant oil, conforming to Specification No. MIL-L-22851, must be used. (See Figure 8-2.)
NOTE
Your GA-7/Cougar was delivered from the factory with a corrosion preventive
aircraft engine oil. If oil must be added during the first 25 hours of engine
operation, use only aviation grade straight mineral oil (Gulf-40 or equivalent)
conforming to Specification No. MIL-L-6082B. (See Figure 8-2.)
CAPACITY OF ENGINE SUMP
The capacity of the engine sump is eight (8) quarts. Do not operate on less than 2 quarts. To minimize loss of oil
through the breather, fill to 7 quart level for normal flights of less than 3 hours. For extended flight, fill to 8 quarts.
These quantities refer to oil dipstick level readings.
OIL CHANGE
After the first 25 hours of operation, drain engine oil sumps and clean the oil suction strainers. Refill sumps with
straight mineral oil and use until a total of 50 hours has accumulated or oil consumption has stabilized; then
change to dispersant oil. Drain the engine oil sumps and oil coolers, and clean oil suction strainers, each 50 hours
thereafter. Change engine oil at least every 6 months even though less than the recommended hours have
accumulated. Reduce intervals for prolonged operation in dusty areas, cold climates, or when short flights and
long idle periods result in sludging conditions.
A full-flow oil filter is available as optional equipment. The filter can increase the oil change interval by 25 to 100
percent, depending on environmental conditions, and provided the filter is replaced after each 50 hours of engine
operation. The full-flown filter, if installed, is located at the rear of the engine.
