Cessna 1969-1976 172 Series Service Manual page 42

SPECIAL INSPECTION ITEMS
5
Each 1000 hours, o r to coincide with engine overhauls.
6
Each 50 hours for general condition and freedom of movement. These controls
7
Each 500 hours
a r e not repairable. Replace as required
at
each engine overhaul.
8
(LYCOMING "BLUE STREAKII)
INTERNAL TIMING: These magnetos cannot be overhauled i n the field. The
coil, capacitor and breaker assembly a r e non- replaceable. As a good
maintenance practice, and to have the benefit of good ignition at all times,
it is
recommended that the magnetos be removed
at
900 hours of magneto
time, and install new exchange magnetos.
MAGNETO-TO-ENGINE TIMING: First 50 hours, f i r s t 100 hours and each 200 hours thereafter.
ROLLS/ROYC E CONTINENTAL
INTERNAL TIMING: A s long as internal timing and magneto-to-engine timing
a r e within the prescribed limits,
it is recommended that magneto be checked
internally only
at
500 hour intervals.
MAGNETO-TO-ENGINE TIMING: Each 100 hours.
9
First 100 hours and each 500 hours thereafter, More often if operated under
prevailing wet
o r
dusty conditions.
10
Replace each 500 hours.
11
Check electrolyte level and clean battery compartment each 50 hours o r each
30 days.
12
Refer to Section 16 of this Manual.
13
Lubrication is required of the actuator each 1000 hours and/or 3 years,
whichever comes first. Refer t o figure 2-5 for g r e a s e specification.
Refer to Section 9 of this Manual for free-play limits, inspection, r e -
placement and/or repair.
14
Refer to paragraph 2-43 for detailed instructions for various s e r i a l ranges.
15
A "one-time" dye penetrant inspection of blades of Model lC172/MTM7653 propellers
should be performed in accordance with Service Letter SE 70-31 (supplement #l).
This inspection should be accomplished within the next 25 hours of operation if this
Service Letter has not been complied with.
NOTE
A high-time inspection is merely
a
100-hour inspection with the addition
of an engine overhaul. Continental recommends engine overhaul a t 1800
hours for the 0-300-series engine, except as stipulated in Continental
a i r c r a f t engine Service Bulletin #M74-20 and supplements thereto.
Lycoming recommends engine overhaul
at
2000 hours for the 0-320-series
engine except as stipulated in Avco Lycoming Service Instruction No. 1009
and revisions thereto. A t the time of overhaul, engine a c c e s s o r i e s should
be overhauled.
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