Extra 300L - Description of the System

Section 909
Smoke System
909 - 6 Page Date: 20. April 2002
Pilot´s Operating Handbook
EXTRA 300L
909.7 DESCRIPTION OF THE SYSTEM
On pilot's demand the smoke system produces a trail of smoke by injection of smoke oil (straight
paraffin oil) into the engine exhaust. The smoke oil is vaporised by the exhaust gas heat and is
visible as dense smoke after leaving the exhaust.
For smoke system activation the "SMOKE ARM" switch located on the pilot instrument panel
needs to be switched ON first. The smoke „ON-OFF“ toggle switch is located on top of the
throttle lever. For filling the smoke oil tanks the "SMOKE REFILL" switch needs to be ON. After
the refill process is completed the "SMOKE REFILL" has to switched OFF. When both switches
("SMOKE ARM" and "SMOKE REFILL") are in the ON position, the smoke system is not
energized and will not run. There are two different systems approved:
A) DUAL PUMP SYSTEM
The main smoke oil tank is filled by a refill pump through a quick connector located in the aircraft
belly fairing. The separate floptube smoke oil tank is interconnected to the main smoke oil tank
and gravity fed. Filled tanks are detected by a float switch placed in the main smoke oil tank which
shuts the refill pump off. An additional injection pump placed at the firewall within the engine
compartment pumps the smoke oil from the floptube smoke oil tank through a solenoid valve
and the injector nozzle into the hot exhaust gas to generate smoke.
The system consists of:
- Main smoke oil tank with float switch
- Floptube smoke oil tank
- Refill pump in the pilot compartment with quick connector in the belly fairing
- Injection pump in the engine compartment with a shut-off solenoid in the pilot
compartment
- ON-OFF switch on the throttle lever
- Two relais (make contact type) for pumps and for the solenoid control
- "SMOKE ARM" switch to arm the system and "SMOKE REFILL" switch for refilling
placed at the instrument-panel
- Circuit breaker for pumps and control placed at the instrument-panel
B) SINGLE PUMP SYSTEM
A pump (reversed polarity) fills the floptube smoke oil tank through a quick connector located
in the aircraft belly fairing. This line includes a filter to prevent dirt to enter the smoke system.
The separate main smoke oil tank is finally filled through the interconnected floptube smoke oil
tank. Filled tanks are detected by a float switch placed in the main smoke oil tank which shuts
CIRCUIT BREAKER
SWITCH
ON ON
OFF OFF
SMOKE SMOKE
ARM REFILL
SMOKE SMOKE
CTRL SYS PUMPS
BREAKER
5
10 or 15
SMOKE SMOKE
PUMPS CONTROL
OFF OFF
SMOKE SMOKE
ARM REFILL
Page Date: 20. January 2016