AIR TRACTOR AT-502A, Maintenance Section

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Air Tractor, Inc. Maintenance Page 67
AT-502A/502B/504 March 14, 2018
DRAINING THE STATIC SYSTEM
The static ports on the AT-502A/502B are the low points of the system and are normally self-
draining. There are "T" fittings on the rear face of the static-port buttons. The downward-facing arm of the
"T" fittings are plugged. These plugs may be removed to drain residual moisture in the static-system lines.
LOW FUEL WARNING SYSTEM
This aircraft incorporates a low fuel warning system that consists of two float switches, one in each tank,
connected to a red warning light. Either float switch can activate the light independent of the other. The
floats are positioned so that the light is activated with approximately 14 gallons usable quantity remaining, if
the aircraft is in level coordinated flight. Uncoordinated flight or flying all the turns in one direction, such as a
racetrack pattern, may result in fewer than 14 gallons usable at the time of a warning light. (For the 502A
with a PT6A-140AG engine (502XP), the low fuel warning light is activated with approximately 22 gallons of
usable quantity remaining). The fuel gauges are the primary instruments for fuel management, and the pilot
should not use the warning light system as a means of determining the quantity of fuel remaining. The wiring
schematic is shown on drawing 60084.
Test Function:
To test the warning light bulb, turn on the master switch, and depress the light.
Corrective Action:
Fly straight and level and monitor fuel gauges. If necessary allow fuel to transfer from tank that has the
greater quantity or land as soon as possible. See FUEL MANAGEMENT Section of your flight manual.
AMSAFE AIRBAG SYSTEM
The AmSafe Airbag system consists of a lap belt and crotch strap attached to the seat frame, a
shoulder harness with integrated airbags, two compressed gas inflators, and an electronics module and
cabling. All maintenance on the system must be performed by an AmSafe Authorized Service Center per
AmSafe Aviation Document Number E510500.
The maintenance requirements of the system include an annual inspection and functional test of the
system. The electronics module must be returned to AmSafe for refurbishment after a period of seven years
from month of manufacture and must be taken out of service after a period of 14 years from month of
manufacture. The inflators must be removed and replaced after a period of 10 years from the month of
manufacture.
Any time any component of the AmSafe Airbag system is disconnected or removed from the aircraft,
the system requires a functional test performed by an AmSafe Authorized Service Center.