Maintenance Precautions; Sub-Systems And Components; Fuel Quantity Indicating System - Thrush Aircraft S2R–T660 Maintenance Manual

THRUSH AIRCRAFT INC – T660 TURBO THRUSH
switch, adjacent to the fuel quantity indicator gauge on the instrument panel. The two fuel tanks are
serviced through filler ports located on the top of both wings. The filler ports incorporate security
chains to prevent the lost of the fuel caps. Service the aircraft from refueling facilities that utilize
proper ground handling equipment and filter systems to remove impurities and water accumulations
from the bulk fuel. If filtering facilities are not available, filter the fuel through a quality high-grade
chamois. Fuel tanks should be serviced after the last flight of each day to reduce condensation and
allow any entrapped water accumulations to settle to the fuel system drains, to be removed, prior to
the next flight.
The establishment of safe maintenance procedures is necessary to ensure safety of personnel and
prevent damage to the aircraft when performing fuel system maintenance. The principle
precautions that should be enforced are enumerated as follows:
A. Perform fuel system maintenance in an approved work area.
B. Ground aircraft and maintenance stands to a common ground; ground- attaching
surfaces must not be painted.
C. Remove external power sources and disconnect batteries.
D. Suspend all maintenance except fuel system maintenance, unless area is declared safe from
explosive vapors.
E. Assure that fire-extinguishing equipment is readily available.
F. Use air-driven power tools only.
G. Use explosive-proof electric lights or flashlights.
H. Wear cotton clothing to avoid possible static electricity discharge.
I. Service, defuel, and refuel aircraft as outlined in Section II.
J. Do not remove components from the fuel system until replacement components or covers are
available for exposed openings.
K. Always replace O-rings, seals, etc. when re-installing fuel system components.

FUEL QUANTITY INDICATING SYSTEM

The fuel quantity indicating system consists of a fuel quantity indicator, located in the left instrument
panel and electrically connected to a fuel quantity transmitter installed in each fuel tank. The fuel
quantity indicating circuit is provided with variable resistors within the transmitters. These resistors
5 -3
AIRCRAFT MAINTENANCE MANUAL

MAINTENANCE PRECAUTIONS

SUB-SYSTEMS AND COMPONENTS

Effective: 12/17/03