AIR TRACTOR AT-502A, Секция обслуживания

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Air Tractor, Inc. Maintenance Page 63
AT-502A/502B/504 March 14, 2018
AVIONICS
Optional radio equipment may include those listed in drawing 60616. Removal or replacement of any
of the radios requires removal of applicable fasteners in accordance with their corresponding installation
drawing as indicated on drawing 60616. All fasteners must be routinely inspected for tightness. Antennas
must be routinely inspected for secure attachment to the aircraft and structural integrity. Routine cleaning of
the avionics box and its components may be done by wiping with a damp cloth. Ventilation openings in
equipment housings should be open and free from obstructing lint and dust. For further information on
testing, adjustment, troubleshooting and repairs of the electronic equipment and systems, refer to the
manufacturer’s maintenance instructions, manuals and the applicable Federal Aviation Regulations.
Additional avionics maintenance information is found in FAA AC 43.13-1B Chapter 11, 12 and 15.
Electrical power to the radios is controlled by a circuit breaker switch located on the radio box.
Power is then distributed to each avionics component which is protected by an adequately rated circuit
breaker located on the radio box or in the lower panel. Wiring schematics specific to each avionics
component may be obtained from manufacturer’s data. These schematics are found in the figures section of
the manual.
LIFE-LIMITED ITEMS
FAA Requirements:
The safe-life of Air Tractor Model AT-502A/502B wing carry-through structure, and attaching
structure is limited to 9,800 hours for serial numbers 502A/502B-0702 and subs. For earlier serial numbers,
see Type Certificate Data Sheet A17SW. For the AT-504, the life is limited to 9,800 hours beginning with the
serial number 504-4001.
Air Tractor Recommendations:
Air Tractor Service Letters are used to communicate field experience that may be helpful to the
owner of the airplane. Some of these service letters recommend the retirement of certain parts after they
have been in operation for a given period of time.
These Air Tractor Service Letters are listed below with an abbreviated explanation of the action
recommended:
Service Letter No. Recommended Action
104 Recommends replacement of main landing-gear springs at between 1500 hours and
3000 hours, depending on type of service. See Service Letter for details.
117 Recommends replacement of landing-gear attaching bolts between 300 hours and
2000 hours, depending on type of service. See Service Letter for details.
119 Recommends replacement of tail landing-gear springs at between 1500 hours and
2000 hours, depending on types of service. See Service Letter for details.