Model 300-14E(L) Selection and Installation Guide
0052-1001-0002 rev K
Page 1 of 3
Oct 27, 2014
MODEL FEATURES AND OPTIONS
Always refer to supplied outline drawing for specific part number of this model type to determine the exact features. Outline drawings
for any Castleberry Instrument unit may be obtained via contact information on our web site:
APPLICABILITY
Before installing the Model 300-14EL gyro, determine that it is appropriate for the application. This gyro comes either as a 14Volt,
28Volt, and 10-32Volt models. Select the part number that is right for the voltage of the aircraft (10-32Volt models may be used in
14Volt or 28Volt aircraft systems). The 300-14EL is designed for use in fixed wing or light helicopter aircraft with shock mounted
panels. It is not intended for use in acrobatic flying. This gyro can travel unrestricted 360 degrees through the roll axis but is limited
to ± 90 degrees of pitch travel.
This product conforms to FAA technical specifications TSO C4c. It is responsibility of the installer and their authority to determine
proper use, purpose, and documentation required to install this product. We do recommend that installers become familiar with FAA
advisory circular AC91-75 and special airworthiness information bulletins CE-05-15 and CE-05-41 since these documents relates to
purpose for recent applications of installing this product.
CONTINUED AIRWORTHINESS
There are no life limited parts or periodic scheduled maintenance requirements on this product to generate a need for continued
airworthiness procedures. It is recommended that the gyro be operated for 30 minutes minimum to redistribute lubricants if the gyro
has been unused for three months or longer.
OPTIONS
Panel tilt is an important specification required to be known when ordering or installing a panel mounted attitude gyro in an aircraft.
If panel tilt is not known, the manufacturer of the aircraft should be able to provide that information. This gyro can be calibrated for a
panel tilt from zero to fourteen degrees and should be specified when ordering. A label is attached to the gyro to indicate the tilt
calibration of each unit. If a newly installed attitude gyro settles more than ± 1½ degrees pitch above or below where the expected
horizon should be, then panel tilt or aircraft trimming issues should be suspected. Note that the gyro comes in a zero degree p/n or a
custom tilt p/n that should be selected when any tilt other than zero degrees is desired. Voltage type 14 or 28 or 10-32 Volt provides
other p/n variance.
LIGHTING
The 300-14E is an unlighted model. The 300-14EL is integrally lighted with externally selectable light tray. The unit comes with a
light tray of the same operating voltage as the gyro, however it may be replaced with other voltage types. Castleberry Instruments has
5, 14 and 28 Volt types available. For some models the wiring to lights is via flying leads that can be easily connected by installer’s
choice of connectors to the lighting buss and other models with internally wired lights through the rear connector. Lamps are of
incandescent type and may be operated by either AC or DC Voltages. The polarity does not matter. Check the outline drawing for
specific part number to see available lighting options.
