1-19. Fuel Nozzle. Fuel nozzle (fig. 1-11) is a single-entry, duual-otifice type unit. It contains an
integral valve for dividing primary and secondary flow. This same valve acts as a fuel shutoff valve when
fuel manifold pressure falls below a predetermined pressure, and keeps fuel out of the combustion chamber
1-20. Ignition System. The engine ignition system (fig. 1-12) consists of a low tension capacitor discharge
ignition exciter, a spark igniter lead, and a shunted-surface gap spark igniter. The system receives its
input power from a 14- to 29-volt dc power source.
Some T63-A-700 engines have an auto reignition system installed to automatically relight the engine
in the event of an inflight flame-out. The system senses compressor discharge pressure and automatically
turns on the ignition system when the rate of decay of compressor discharge pressure exceeds a predeter-
mined rate. When an automatic reignition is initiated, the auto reignition light illuminates and the ignition
system is energized. After approximately 2.8 seconds, the ignition system deenergizes; however, the auto
reignition light remains illuminated until it is manually turned off (reset).