Cub Crafters CC18-180 Maintenance Manual page 268

3. MAINTENANCE PRACTICES
A. ATC TRANSPONDER TEST
A transponder test is required every 24 calendar months in accordance with 14 CFR 91.413.
The transponder is located in the instrument panel at the bottom of the radio stack. The encoder
is mounted to the top of the front right interior panel underneath the instrument panel.
B. ALTIMETER STATIC SYSTEM TEST AND INSPECTION
Static system tests must comply with the requirements of 14 CFR 91.411 and be performed by
a rated repair station with the appropriate test equipment. A static leak test should be
accomplished whenever a connection has been loosened or an instrument replaced.
(1) STATIC SYSTEM LEAK TEST
(a) Connect the test equipment directly to a static port and seal off the opposite
static port with plastic tape.
Do not blow air through the line toward the instrument panel. This may seriously damage
(b) Apply a vacuum equivalent to 1,000 feet altitude, (differential pressure of
approximately 1.07 inches of mercury or 14.5 inches of water) and hold.
(c) After 1 minute, check that the leak has not exceeded the equivalent of 100 feet of
altitude (decrease in differential pressure of approximately 0.0105 inches of
mercury or 1.43 inches of water).
(d) Unseal the static port and disconnect the equipment.
(2) PITOT SYSTEM LEAK CHECK
(a) Seal the drain hole on the bottom of the pitot tube and connect the pitot pressure
opening to a tee to which a source of pressure and manometer or reliable
indicator is connected.
(b) Restrain the hoses to prevent them from moving excessively when the pressure
is applied.
(c) Apply pressure until the airspeed indicator indicates 150 m.p.h. (130 kts)
(equivalent to a differential pressure 1.1 inches of mercury or 14.9 inches of
water). Hold this pressure and clamp off from the source of pressure. After 1
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CUB CRAFTERS, INC.
CC18-180 MAINTENANCE MANUAL
CAUTION
the instruments.
Manual numberTC10000AMM
Date: 05/20/08